56148
2020
2020
eng
1221
1238
18
6
14
article
Emerald Group Publishing Limited
Bingley
1
2020-05-14
2020-05-14
--
Powered by blockchain
Purpose: The purpose of this study is to formulate the most probable future scenario for the use of blockchain technology within the next 5–10 years in the electricity sector based on today’s experts’ views.
Design/methodology/approach: An international, two-stage Delphi study with 20 projections is used.
Findings: According to the experts, blockchain applications will be primarily based on permissioned or consortium blockchains. Blockchain-based applications will integrate Internet of Things devices in the power grid, manage the e-mobility infrastructure, automate billing and direct payment and issue certificates regarding the origin of electricity. Blockchain solutions are expected to play an important big role in fostering peer-to-peer trading in microgrids, further democratizing and decentralizing the energy sector. New regulatory frameworks become necessary.
Research limitations/implications: The Delphi study’s scope is rather broad than narrow and detailed. Further studies should focus on partial scenarios.
Practical implications: Electricity market participants should build blockchain-based competences and collaborate in current pilot projects.
Social implications: Blockchain technology will further decentralize the energy sector and probably reduce transaction costs. Originality/value: Despite the assumed importance of blockchain technology, no coherent foresight study on its use and implications exists yet. This study closes this research gap.
International journal of energy sector management
forecasting blockchain use in the electricity market
10.1108/IJESM-10-2019-0002
1750-6220
1750-6239
outputup:dataSource:WoS:2020
WOS:000532859800001
Tiberius, V (corresponding author), Univ Potsdam, Fac Econ & Social Sci, Potsdam, Germany., shoehne@uni-potsdam.de; tiberius@uni-potsdam.de
Tiberius, Victor
2022-09-23T11:14:41+00:00
sword
importub
filename=package.tar
9a8caaa5fe4f6da9e9a107e0b24c1506
2280261-7
false
true
Stefan Höhne
Victor Tiberius
eng
uncontrolled
innovation
eng
uncontrolled
surveys
eng
uncontrolled
scenario analysis
eng
uncontrolled
blockchain technology
eng
uncontrolled
Delphi
eng
uncontrolled
method
eng
uncontrolled
digitization
eng
uncontrolled
electricity market
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Referiert
Import
Fachgruppe Betriebswirtschaftslehre
53101
2018
2018
eng
25
612
article
EDP Sciences
Les Ulis
H E S S Collaboration
1
2018-04-09
2018-04-09
--
The population of TeV pulsar wind nebulae in the HESS Galactic Plane Survey
The nine-year H.E.S.S. Galactic Plane Survey (HGPS) has yielded the most uniform observation scan of the inner Milky Way in the TeV gamma-ray band to date. The sky maps and source catalogue of the HGPS allow for a systematic study of the population of TeV pulsar wind nebulae found throughout the last decade. To investigate the nature and evolution of pulsar wind nebulae, for the first time we also present several upper limits for regions around pulsars without a detected TeV wind nebula. Our data exhibit a correlation of TeV surface brightness with pulsar spindown power (E) over dot. This seems to be caused both by an increase of extension with decreasing (E) over dot, and hence with time, compatible with a power law R-PWN((E) over dot) similar to(E) over dot(0.65 +/- 0.20), and by a mild decrease of TeV gamma-ray luminosity with decreasing (E) over dot, compatible with L-1 (10 TeV) similar to (E) over dot(0.59 +/- 0.21). We also find that the off sets of pulsars with respect to the wind nebula centre with ages around 10 kyr are frequently larger than can be plausibly explained by pulsar proper motion and could be due to an asymmetric environment. In the present data, it seems that a large pulsar off set is correlated with a high apparent TeV efficiency L1- 10 TeV / (E) over dot. In addition to 14 HGPS sources considered firmly identified pulsar wind nebulae and 5 additional pulsar wind nebulae taken from literature, we find 10 HGPS sources that are likely TeV pulsar wind nebula candidates. Using a model that subsumes the present common understanding of the very high-energy radiative evolution of pulsar wind nebulae, we find that the trends and variations of the TeV observables and limits can be reproduced to a good level, drawing a consistent picture of present-day TeV data and theory.
Astronomy and astrophysics : an international weekly journal
10.1051/0004-6361/201629377
1432-0746
wos:2018
A2
WOS:000429404700002
Mayer, M (reprint author), Humboldt Univ, Inst Phys, Newtonstr 15, D-12489 Berlin, Germany.; Gallant, YA (reprint author), Univ Montpellier, CNRS, IN2P3, Lab Univers & Particules Montpellier, CC 72,Pl Eugene Bataillon, F-34095 Montpellier 5, France.; Valerius, K (reprint author), Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany.; Klepser, S (reprint author), DESY, D-15738 Zeuthen, Germany.; Valerius, K (reprint author), Karlsruhe Inst Technol, Inst Nucl Phys, POB 3640, D-76021 Karlsruhe, Germany.
German Ministry for Education and Research (BMBF)Federal Ministry of Education & Research (BMBF); Max Planck SocietyMax Planck SocietyFoundation CELLEX; German Research Foundation (DFG)German Research Foundation (DFG); French Ministry for ResearchMinistry of Research, France; CNRS-IN2P3Centre National de la Recherche Scientifique (CNRS); Astroparticle Interdisciplinary Programme of the CNRS; U.K. Science and Technology Facilities Council (STFC)Science & Technology Facilities Council (STFC); IPNP of the Charles University; Czech Science FoundationGrant Agency of the Czech Republic; Polish Ministry of Science and Higher EducationMinistry of Science and Higher Education, Poland; South African Department of Science and Technology; National Research Foundation; University of Namibia; Innsbruck University; Austrian Science Fund (FWF)Austrian Science Fund (FWF); Austrian Federal Ministry for Science, Research and Economy; University of Adelaide; Australian Research CouncilAustralian Research Council; EGI Federation
2021-12-13T12:00:43+00:00
sword
importub
filename=package.tar
b86c105e23e3b7a8eb9721a2d7205272
false
true
Hassan E. Abdalla
A. Abramowski
Felix A. Aharonian
F. Ait Benkhali
A. G. Akhperjanian
T. Andersson
E. O. Anguener
M. Arrieta
P. Aubert
M. Backes
A. Balzer
M. Barnard
Y. Becherini
J. Becker Tjus
D. Berge
S. Bernhard
K. Bernloehr
R. Blackwell
M. Boettcher
C. Boisson
J. Bolmont
Pol Bordas
J. Bregeon
F. Brun
P. Brun
M. Bryan
T. Bulik
M. Capasso
J. Carr
S. Carrigan
Sabrina Casanova
M. Cerruti
N. Chakraborty
R. Chalme-Calvet
R. C. G. Chaves
A. Chen
J. Chevalier
M. Chretien
S. Colafrancesco
G. Cologna
B. Condon
J. Conrad
C. Couturier
Y. Cui
I. D. Davids
B. Degrange
C. Deil
J. Devin
P. dewilt
L. Dirson
A. Djannati-Atai
W. Domainko
A. Donath
G. Dubus
K. Dutson
J. Dyks
T. Edwards
Kathrin Egberts
P. Eger
J. -P. Ernenwein
S. Eschbach
C. Farnier
S. Fegan
M. V. Fernandes
A. Fiasson
G. Fontaine
A. Foerster
S. Funk
M. Fuessling
S. Gabici
M. Gajdus
Y. A. Gallant
T. Garrigoux
G. Giavitto
B. Giebels
J. F. Glicenstein
D. Gottschall
A. Goyal
M. -H. Grondin
D. Hadasch
J. Hahn
M. Haupt
J. Hawkes
G. Heinzelmann
G. Henri
G. Hermann
O. Hervet
A. Hillert
J. A. Hinton
W. Hofmann
Clemens Hoischen
M. Holler
D. Horns
A. Ivascenko
A. Jacholkowska
M. Jamrozy
M. Janiak
D. Jankowsky
F. Jankowsky
M. Jingo
T. Jogler
L. Jouvin
I. Jung-Richardt
M. A. Kastendieck
K. Katarzynski
U. Katz
D. Kerszberg
B. Khelifi
M. Kieffer
J. King
S. Klepser
D. Klochkov
W. Kluzniak
D. Kolitzus
Nu. Komin
K. Kosack
S. Krakau
M. Kraus
F. Krayzel
P. P. Krueger
H. Laffon
G. Lamanna
J. Lau
J. -P. Lees
J. Lefaucheur
V. Lefranc
A. Lemiere
M. Lemoine-Goumard
J. -P. Lenain
Eva Leser
T. Lohse
M. Lorentz
R. Liu
R. Lopez-Coto
I. Lypova
V. Marandon
A. Marcowith
C. Mariaud
R. Marx
G. Maurin
N. Maxted
M. Mayer
P. J. Meintjes
M. Meyer
A. M. W. Mitchell
R. Moderski
M. Mohamed
L. Mohrmann
K. Mora
E. Moulin
T. Murach
M. de Naurois
F. Niederwanger
J. Niemiec
L. Oakes
H. Odaka
S. Oettl
S. Ohm
E. de Ona Wilhelmi
M. Ostrowski
I. Oya
M. Padovani
M. Panter
R. D. Parsons
M. Paz Arribas
N. W. Pekeur
G. Pelletier
C. Perennes
P. -O. Petrucci
B. Peyaud
S. Pita
H. Poon
D. Prokhorov
H. Prokoph
G. Puehlhofer
M. Punch
A. Quirrenbach
S. Raab
A. Reimer
O. Reimer
M. Renaud
R. de los Reyes
F. Rieger
C. Romoli
S. Rosier-Lees
G. Rowell
B. Rudak
C. B. Rulten
V. Sahakian
D. Salek
D. A. Sanchez
A. Santangelo
M. Sasaki
R. Schlickeiser
F. Schuessler
A. Schulz
U. Schwanke
S. Schwemmer
M. Settimo
A. S. Seyffert
N. Shafi
I. Shilon
R. Simoni
H. Sol
F. Spanier
G. Spengler
F. Spies
L. Stawarz
R. Steenkamp
Christian Stegmann
F. Stinzing
K. Stycz
I. Sushch
J. -P. Tavernet
T. Tavernier
A. M. Taylor
R. Terrier
L. Tibaldo
D. Tiziani
M. Tluczykont
C. Trichard
R. Tuffs
Y. Uchiyama
K. Valerius
D. J. van der Walt
C. van Eldik
B. van Soelen
G. Vasileiadis
J. Veh
C. Venter
A. Viana
P. Vincent
J. Vink
F. Voisin
H. J. Voelk
T. Vuillaume
Z. Wadiasingh
S. J. Wagner
P. Wagner
R. M. Wagner
R. White
A. Wierzcholska
P. Willmann
A. Woernlein
D. Wouters
R. Yang
V. Zabalza
D. Zaborov
M. Zacharias
A. A. Zdziarski
Alraune Zech
F. Zefi
A. Ziegler
N. Zywucka
eng
uncontrolled
gamma rays: general
eng
uncontrolled
catalogs
eng
uncontrolled
surveys
eng
uncontrolled
ISM: supernova remnants
eng
uncontrolled
pulsars: general
Physik
Institut für Physik und Astronomie
Referiert
Import
Bronze Open-Access
53099
2018
2018
eng
61
612
article
EDP Sciences
Les Ulis
H E S S Collaboration
1
2018-04-09
2018-04-09
--
The HESS Galactic plane survey
We present the results of the most comprehensive survey of the Galactic plane in very high-energy (VHE) gamma-rays, including a public release of Galactic sky maps, a catalog of VHE sources, and the discovery of 16 new sources of VHE gamma-rays. The High Energy Spectroscopic System (H.E.S.S.) Galactic plane survey (HGPS) was a decade-long observation program carried out by the H.E.S.S. I array of Cherenkov telescopes in Namibia from 2004 to 2013. The observations amount to nearly 2700 h of quality-selected data, covering the Galactic plane at longitudes from l = 250 degrees to 65 degrees and latitudes vertical bar b vertical bar <= 3 degrees. In addition to the unprecedented spatial coverage, the HGPS also features a relatively high angular resolution (0.08 degrees approximate to 5 arcmin mean point spread function 68% containment radius), sensitivity (less than or similar to 1.5% Crab flux for point-like sources), and energy range (0.2-100 TeV). We constructed a catalog of VHE gamma-ray sources from the HGPS data set with a systematic procedure for both source detection and characterization of morphology and spectrum. We present this likelihood-based method in detail, including the introduction of a model component to account for unresolved, large-scale emission along the Galactic plane. In total, the resulting HGPS catalog contains 78 VHE sources, of which 14 are not reanalyzed here, for example, due to their complex morphology, namely shell-like sources and the Galactic center region. Where possible, we provide a firm identification of the VHE source or plausible associations with sources in other astronomical catalogs. We also studied the characteristics of the VHE sources with source parameter distributions. 16 new sources were previously unknown or unpublished, and we individually discuss their identifications or possible associations. We firmly identified 31 sources as pulsar wind nebulae (PWNe), supernova remnants (SNRs), composite SNRs, or gamma-ray binaries. Among the 47 sources not yet identified, most of them (36) have possible associations with cataloged objects, notably PWNe and energetic pulsars that could power VHE PWNe.
Astronomy and astrophysics : an international weekly journal
10.1051/0004-6361/201732098
1432-0746
wos:2018
A1
WOS:000429404700001
Deil, C; Donath, A; Marandon, V (reprint author), Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany.; Chaves, RCG (reprint author), Univ Montpellier, CNRS, IN2P3, Lab Univers & Particules Montpellier, CC 72,Pl Eugene Bataillon, F-34095 Montpellier 5, France.; Brun, F (reprint author), Univ Bordeaux, CNRS, IN2P3, Ctr Etud Nucl Bordeaux Gradignan, F-33175 Gradignan, France.
German Ministry for Education and Research (BMBF)Federal Ministry of Education & Research (BMBF); Max Planck SocietyMax Planck SocietyFoundation CELLEX; German Research Foundation (DFG)German Research Foundation (DFG); French Ministry for ResearchMinistry of Research, France; CNRS-IN2P3Centre National de la Recherche Scientifique (CNRS); Astroparticle Interdisciplinary Programme of the CNRS; U.K. Science and Technology Facilities Council (STFC)Science & Technology Facilities Council (STFC); IPNP of the Charles University; Czech Science FoundationGrant Agency of the Czech Republic; Polish Ministry of Science and Higher EducationMinistry of Science and Higher Education, Poland; South African Department of Science and Technology; National Research Foundation; University of Namibia; Innsbruck University; Austrian Science Fund (FWF)Austrian Science Fund (FWF); Austrian Federal Ministry for Science, Research and Economy; University of Adelaide; Australian Research CouncilAustralian Research Council; EGI Federation
2021-12-13T11:42:59+00:00
sword
importub
filename=package.tar
325a6fb163f2b47e368e1e43a6d85c4d
false
true
Hassan E. Abdalla
A. Abramowski
Felix A. Aharonian
F. Ait Benkhali
E. O. Anguener
M. Arakawa
M. Arrieta
P. Aubert
M. Backes
A. Balzer
M. Barnard
Y. Becherini
J. Becker Tjus
D. Berge
S. Bernhard
K. Bernloehr
R. Blackwell
M. Boettcher
C. Boisson
J. Bolmont
S. Bonnefoy
Pol Bordas
J. Bregeon
F. Brun
P. Brun
M. Bryan
M. Buechele
T. Bulik
M. Capasso
S. Carrigan
S. Caroff
A. Carosi
Sabrina Casanova
M. Cerruti
N. Chakraborty
R. C. G. Chaves
A. Chen
J. Chevalier
S. Colafrancesco
B. Condon
J. Conrad
I. D. Davids
J. Decock
C. Deil
J. Devin
P. deWilt
L. Dirson
A. Djannati-Atai
W. Domainko
A. Donath
K. Dutson
J. Dyks
T. Edwards
Kathrin Egberts
P. Eger
G. Emery
J. -P. Ernenwein
S. Eschbach
C. Farnier
S. Fegan
M. V. Fernandes
A. Fiasson
G. Fontaine
A. Foerster
S. Funk
M. Fuessling
S. Gabici
Y. A. Gallant
T. Garrigoux
H. Gast
F. Gate
G. Giavitto
B. Giebels
D. Glawion
J. F. Glicenstein
D. Gottschall
M. -H. Grondin
J. Hahn
M. Haupt
J. Hawkes
G. Heinzelmann
G. Henri
G. Hermann
J. A. Hinton
W. Hofmann
Clemens Hoischen
T. L. Holch
M. Holler
D. Horns
A. Ivascenko
H. Iwasaki
A. Jacholkowska
M. Jamrozy
D. Jankowsky
F. Jankowsky
M. Jingo
L. Jouvin
I. Jung-Richardt
M. A. Kastendieck
K. Katarzynski
M. Katsuragawa
U. Katz
D. Kerszberg
D. Khangulyan
B. Khelifi
J. King
S. Klepser
D. Klochkov
W. Kluzniak
Nu. Komin
K. Kosack
S. Krakau
M. Kraus
P. P. Krueger
H. Laffon
G. Lamanna
J. Lau
J. -P. Lees
J. Lefaucheur
A. Lemiere
M. Lemoine-Goumard
J. -P. Lenain
Eva Leser
T. Lohse
M. Lorentz
R. Liu
R. Lopez-Coto
I. Lypova
V. Marandon
D. Malyshev
A. Marcowith
C. Mariaud
R. Marx
G. Maurin
N. Maxted
M. Mayer
P. J. Meintjes
M. Meyer
A. M. W. Mitchell
R. Moderski
M. Mohamed
L. Mohrmann
K. Mora
E. Moulin
T. Murach
S. Nakashima
M. de Naurois
H. Ndiyavala
F. Niederwanger
J. Niemiec
L. Oakes
H. Odaka
S. Ohm
M. Ostrowski
I. Oya
M. Padovani
M. Panter
R. D. Parsons
M. Paz Arribas
N. W. Pekeur
G. Pelletier
C. Perennes
P. -O. Petrucci
B. Peyaud
Q. Piel
S. Pita
V. Poireau
H. Poon
D. Prokhorov
H. Prokoph
G. Puehlhofer
M. Punch
A. Quirrenbach
S. Raab
R. Rauth
A. Reimer
O. Reimer
M. Renaud
R. de los Reyes
F. Rieger
L. Rinchiuso
C. Romoli
G. Rowell
B. Rudak
C. B. Rulten
S. Safi-Harb
V. Sahakian
S. Saito
D. A. Sanchez
A. Santangelo
M. Sasaki
M. Schandri
R. Schlickeiser
F. Schuessler
A. Schulz
U. Schwanke
S. Schwemmer
M. Seglar-Arroyo
M. Settimo
A. S. Seyffert
N. Shafi
I. Shilon
K. Shiningayamwe
R. Simoni
H. Sol
F. Spanier
M. Spir-Jacob
L. Stawarz
R. Steenkamp
Christian Stegmann
Constantin Beverly Steppa
I. Sushch
T. Takahashi
J. -P. Tavernet
T. Tavernier
A. M. Taylor
R. Terrier
L. Tibaldo
D. Tiziani
M. Tluczykont
C. Trichard
M. Tsirou
N. Tsuji
R. Tuffs
Y. Uchiyama
D. J. van der Walt
C. van Eldik
C. van Rensburg
B. van Soelen
G. Vasileiadis
J. Veh
C. Venter
A. Viana
P. Vincent
J. Vink
F. Voisin
H. J. Voelk
T. Vuillaume
Z. Wadiasingh
S. J. Wagner
P. Wagner
R. M. Wagner
R. White
A. Wierzcholska
P. Willmann
A. Woernlein
D. Wouters
R. Yang
D. Zaborov
M. Zacharias
R. Zanin
A. A. Zdziarski
Alraune Zech
F. Zefi
A. Ziegler
J. Zorn
N. Zywucka
eng
uncontrolled
gamma rays: general
eng
uncontrolled
surveys
eng
uncontrolled
Galaxy: general
Physik
Institut für Physik und Astronomie
Referiert
Import
Bronze Open-Access
50278
2018
2018
eng
4570
4591
22
4
482
article
Oxford Univ. Press
Oxford
1
2018-11-06
2018-11-06
--
A Gaia Data Release 2 catalogue of white dwarfs and a comparison with SDSS
We present a catalogue of white dwarf candidates selected from the second data release of Gaia (DR2). We used a sample of spectroscopically confirmed white dwarfs from the Sloan Digital Sky Survey (SDSS) to map the entire space spanned by these objects in the Gaia Hertzsprung–Russell diagram. We then defined a set of cuts in absolute magnitude, colour, and a number of Gaia quality flags to remove the majority of contaminating objects. Finally, we adopt a method analogous to the one presented in our earlier SDSS photometric catalogues to calculate a probability of being a white dwarf (PWD) for all Gaia sources that passed the initial selection. The final catalogue is composed of 486641 stars with calculated PWD from which it is possible to select a sample of ≃260000 high-confidence white dwarf candidates in the magnitude range 8 < G < 21. By comparing this catalogue with a sample of SDSS white dwarf candidates, we estimate an upper limit in completeness of 85 per cent for white dwarfs with G ≤ 20 mag and Teff >7000 K, at high Galactic latitudes (|b| > 20°). However, the completeness drops at low Galactic latitudes, and the magnitude limit of the catalogue varies significantly across the sky as a function of Gaia’s scanning law. We also provide the list of objects within our sample with available SDSS spectroscopy. We use this spectroscopic sample to characterize the observed structure of the white dwarf distribution in the H–R diagram.
Monthly notices of the Royal Astronomical Society
10.1093/mnras/sty3016
0035-8711
1365-2966
wos:2019
WOS:000462327300022
Fusillo, NPG (reprint author), Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England., n.gentile-fusillo@warwick.ac.uk
research and innovation programmeEuropean Research Council (ERC) (FP/2007-2013)/ERC Grant [320964]; STFCScience & Technology Facilities Council (STFC) [ST/P000495/1]; German Science foundation (DFG)German Research Foundation (DFG) [HE1356/71-1, IR190/1-1]; Alfred P. Sloan FoundationAlfred P. Sloan Foundation; National Science FoundationNational Science Foundation (NSF); U.S. Department of Energy Office of ScienceUnited States Department of Energy (DOE); National Aeronautics and Space AdministrationNational Aeronautics & Space Administration (NASA) [NNX08AR22G]; National Science FoundationNational Science Foundation (NSF) [AST-1238877]
2021-04-12T12:44:57+00:00
sword
importub
filename=package.tar
6f132471ed4194d1356596b816777f78
Fusillo, Nicola Pietro Gentile
false
true
Nicola Pietro Gentile Fusillo
Pier-Emmanuel Tremblay
Boris T. Gänsicke
Christopher J. Manser
Tim Cunningham
Elena Cukanovaite
Mark Hollands
Thomas Marsh
Roberto Raddi
Stefan Jordan
Silvia Toonen
Stephan Alfred Geier
Martin Barstow
Jeffrey D. Cummings
eng
uncontrolled
catalogues
eng
uncontrolled
surveys
eng
uncontrolled
white dwarfs
Astronomie und zugeordnete Wissenschaften
Institut für Physik und Astronomie
Referiert
Import
Green Open-Access
48927
2019
2019
eng
520
530
11
3
68
article
Wiley
Hoboken
1
2019-07-19
2019-04-04
--
Assessment of irrigation scheduling systems in Germany
In Germany, the irrigation sector accounts for only 1% of water use. In recent years, however, this sector has attracted more attention due to the occurrence of severe drought periods. Irrigation scheduling systems could support adaptation strategies but little is known about current providers, performance and users. In this study we aimed to depict the current situation of the existence and functioning of irrigation scheduling systems available in Germany. Six methods were identified and assessed based on direct interviews with end-users and a comparative analysis. The results showed a positive feedback from the users. However, the recommendations were rarely implemented, while only the seasonal irrigation requirement was considered to support actual water abstraction. These results were corroborated by the comparative analysis. Five of the six irrigation scheduling systems estimated the seasonal irrigation amount consistently, while wider differences were found by looking at the irrigation season and at the number of irrigations. Overall, it is found that irrigation support systems are valuable tools for supporting adaptation strategies to fast changes in agro-environmental conditions. However, specific assessments based on real measurements should be considered in order to improve the performance of the systems and provide more consistent support to end-users. (c) 2019 John Wiley & Sons, Ltd.
Irrigation and drainage
survey of the users and comparative study
10.1002/ird.2337
1531-0353
1531-0361
wos:2019
WOS:000476571700014
Baroni, G (reprint author), Univ Potsdam, Inst Earth & Environm Sci, Karl Liebknecht Str 24-25, D-14471 Potsdam, Germany., baroni@uni-potsdam.de
2021-01-15T09:47:58+00:00
sword
importub
filename=package.tar
b9d654d539458b9d8cce81bcc3e33506
false
true
Gabriele Baroni
Katrin Drastig
Anna-Ulrike Lichtenfeld
Leonie Jost
Peter Claas
eng
uncontrolled
irrigation
eng
uncontrolled
modelling systems
eng
uncontrolled
surveys
eng
uncontrolled
assessment
eng
uncontrolled
Germany
Geowissenschaften
Institut für Geowissenschaften
Referiert
Import
48434
2019
2019
eng
29
630
article
EDP Sciences
Les Ulis
1
--
2019-09-24
--
The EREBOS project: Investigating the effect of substellar and low-mass stellar companions on late stellar evolution Survey, target selection, and atmospheric parameters
Eclipsing post-common-envelope binaries are highly important for resolving the poorly understood, very short-lived common-envelope phase of stellar evolution. Most hot subdwarfs (sdO/Bs) are the bare helium-burning cores of red giants that have lost almost all of their hydrogen envelope. This mass loss is often triggered by common-envelope interactions with close stellar or even substellar companions. Cool companions to hot subdwarf stars such as late-type stars and brown dwarfs are detectable from characteristic light-curve variations - reflection effects and often eclipses. In the recently published catalog of eclipsing binaries in the Galactic Bulge and in the Asteroid Terrestrial-impact Last Alert System (ATLAS) survey, we discovered 125 new eclipsing systems showing a reflection effect seen by visual inspection of the light curves and using a machine-learning algorithm, in addition to the 36 systems previously discovered by the Optical Gravitational Lesing Experiment (OGLE) team. The Eclipsing Reflection Effect Binaries from Optical Surveys (EREBOS) project aims at analyzing all newly discovered eclipsing binaries of the HW Vir type (hot subdwarf + close, cool companion) based on a spectroscopic and photometric follow up to derive the mass distribution of the companions, constrain the fraction of substellar companions, and determine the minimum mass needed to strip off the red-giant envelope. To constrain the nature of the primary we derived the absolute magnitude and the reduced proper motion of all our targets with the help of the parallaxes and proper motions measured by the Gaia mission and compared those to the Gaia white-dwarf candidate catalog. It was possible to derive the nature of a subset of our targets, for which observed spectra are available, by measuring the atmospheric parameter of the primary, confirming that less than 10% of our systems are not sdO/Bs with cool companions but are white dwarfs or central stars of planetary nebula. This large sample of eclipsing hot subdwarfs with cool companions allowed us to derive a significant period distribution for hot subdwarfs with cool companions for the first time showing that the period distribution is much broader than previously thought and is ideally suited to finding the lowest-mass companions to hot subdwarf stars. The comparison with related binary populations shows that the period distribution of HW Vir systems is very similar to WD+dM systems and central stars of planetary nebula with cool companions. In the future, several new photometric surveys will be carried out, which will further increase the sample of this project, providing the potential to test many aspects of common-envelope theory and binary evolution.
Astronomy and astrophysics : an international weekly journal
10.1051/0004-6361/201936019
1432-0746
wos:2019
A80
WOS:000487350900004
Schaffenroth, V (reprint author), Univ Potsdam, Inst Phys & Astron, Haus 28,Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany., schaffenroth@astro.physik.uni-potsdam.de
European Organisation for Astronomical Research in the Southern Hemisphere under ESO programme [092.D-0040(A), 095.D-0167(A), 196.D-0214(A-D), 099.D-0217(A), 0101.D-0791(A)]; Chilean Time Allocation Committee [CL-2016B-018]; Deutsche Forschungsgemeinschaft (DFG)German Research Foundation (DFG) [GE 2506/9-1]; National Science FoundationNational Science Foundation (NSF) [AST-1812874, PHY 17-148958]; University of theWestern Cape; National Research Foundation of South AfricaNational Research Foundation - South Africa; Deutsche ForschungsgemeinschaftGerman Research Foundation (DFG) [GE2506/12-1]; DAAD PPP USA
importub
2020-11-25T18:01:19+00:00
filename=package.tar
d8058a65716a63234e73185e2962aa6d
false
true
Veronika Schaffenroth
Brad N. Barlow
Stephan Alfred Geier
Maja Vuckovic
D. Kilkenny
M. Wolz
Thomas Kupfer
Ulrich Heber
H. Drechsel
S. Kimeswenger
T. Marsh
M. Wolf
Ingrid Domingos Pelisoli
Joseph Freudenthal
S. Dreizler
S. Kreuzer
E. Ziegerer
eng
uncontrolled
binaries: eclipsing
eng
uncontrolled
brown dwarfs
eng
uncontrolled
binaries: spectroscopic
eng
uncontrolled
binaries: close
eng
uncontrolled
subdwarfs
eng
uncontrolled
surveys
Astronomie und zugeordnete Wissenschaften
Institut für Physik und Astronomie
Referiert
Open Access
Import
Bronze Open-Access
48322
2019
2019
eng
2892
2903
12
2
488
article
Oxford Univ. Press
Oxford
1
--
2019-07-10
--
Gaia Data Release 2 catalogue of extremely low-mass white dwarf candidates
Extremely low-mass white dwarf stars (ELMs) are M < 0.3 M-circle dot helium-core white dwarfs born either as a result of a common-envelope phase or after a stable Roche lobe overflow episode in a multiple system. The Universe is not old enough for ELMs to have formed through single-star evolution channels. As remnants of binary evolution, ELMs can shed light onto the poorly understood phase of common-envelope evolution and provide constraints to the physics of mass accretion. Most known ELMs will merge in less than a Hubble time, providing an important contribution to the signal to be detected by upcoming space-based gravitational wave detectors. There are currently less than 150 known ELMs; most were selected by colour, focusing on hot objects, in a magnitude-limited survey of the Northern hemisphere only. Recent theoretical models have predicted a much larger space density for ELMs than estimated observationally based on this limited sample. In order to perform meaningful comparisons with theoretical models and test their predictions, a larger well-defined sample is required. In this work, we present a catalogue of ELM candidates selected from the second data release of Gaia (DR2). We have used predictions from theoretical models and analysed the properties of the known sample to map the space spanned by ELMs in the Gaia Hertzsprung-Russell diagram. Defining a set of colour cuts and quality flags, we have obtained a final sample of 5762 ELM candidates down to T-eff approximate to 5000 K.
Monthly notices of the Royal Astronomical Society
10.1093/mnras/stz1876
0035-8711
1365-2966
wos:2019
WOS:000482332500096
Pelisoli, I (reprint author), Univ Potsdam, Inst Phys & Astron, Haus 28,Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany., pelisoli@astro.physik.uni-potsdam.de
Deutsche ForschungsgemeinschaftGerman Research Foundation (DFG) [GE2506/12-1]; Alexander von Humboldt FoundationAlexander von Humboldt Foundation
importub
2020-11-18T12:27:12+00:00
filename=package.tar
317e0ddb0f3b6b4313ff5e60d04e504c
false
true
Ingrid Domingos Pelisoli
Joris Vos
eng
uncontrolled
catalogues
eng
uncontrolled
surveys
eng
uncontrolled
binaries: close
eng
uncontrolled
white dwarfs
Astronomie und zugeordnete Wissenschaften
Institut für Physik und Astronomie
Referiert
Open Access
Import
Green Open-Access
46204
2017
2017
eng
310
326
25
154
article
IOP Publ. Ltd.
Bristol
1
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--
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SMASH: Survey of the MAgellanic Stellar History
The Large and Small Magellanic Clouds are unique local laboratories for studying the formation and evolution of small galaxies in exquisite detail. The Survey of the MAgellanic Stellar History (SMASH) is an NOAO community Dark Energy Camera (DECam) survey of the Clouds mapping 480 deg2 (distributed over similar to 2400 square degrees at similar to 20% filling factor) to similar to 24th. mag in ugriz. The primary goals of SMASH are to identify low surface brightness stellar populations associated with the stellar halos and tidal debris of the Clouds, and to derive spatially resolved star formation histories. Here, we present a summary of the survey, its data reduction, and a description of the first public Data Release (DR1). The SMASH DECam data have been reduced with a combination of the NOAO Community Pipeline, the PHOTRED automated point-spread-function photometry pipeline, and custom calibration software. The astrometric precision is similar to 15 mas and the accuracy is similar to 2 mas with respect to the Gaia reference frame. The photometric precision is similar to 0.5%-0.7% in griz and similar to 1% in u with a calibration accuracy of similar to 1.3% in all bands. The median 5s point source depths in ugriz are 23.9, 24.8, 24.5, 24.2, and 23.5 mag. The SMASH data have already been used to discover the Hydra II Milky Way satellite, the SMASH 1 old globular cluster likely associated with the LMC, and extended stellar populations around the LMC out to R. similar to. 18.4 kpc. SMASH DR1 contains measurements of similar to 100 million objects distributed in 61 fields. A prototype version of the NOAO Data Lab provides data access and exploration tools.
The astronomical journal
10.3847/1538-3881/aa8d1c
0004-6256
1538-3881
wos:2017
199
WOS:000413751400003
Nidever, DL (reprint author), Natl Opt Astron Observ, 950 North Cherry Ave, Tucson, AZ 85719 USA.; Nidever, DL (reprint author), Large Synopt Survey Telescope, 950 North Cherry Ave, Tucson, AZ 85719 USA.; Nidever, DL (reprint author), Univ Arizona, Steward Observ, 933 North Cherry Ave, Tucson, AZ 85721 USA.; Nidever, DL (reprint author), Univ Michigan, Dept Astron, 1085 S Univ Ave, Ann Arbor, MI 48109 USA., dnidever@noao.edu
McLaughlin Fellowship at the University of Michigan; NSF [AST 1655677, AST 1008342, 1655677, AST 1313006, AST 1312863]; Australian Research Council [DP150100862]; ERC [308024]; German Academic Exchange Service [ST/M001008/1]; German Academic Exchange Service (DAAD), from the the research and innovation programme [682115]; Netherlands Organization for Scientific Research (NWO) Veni grant [639.041.131]; "The Milky Way System" of the German Research Foundation (DFB) [Sonderforschungsbereich (SFB) 881]; CONICYT Anillo project [ACT-1122, BASAL PFB-06]; NASA; U.S. Department of Energy; U.S. National Science Foundation; Ministry of Science and Education of Spain; Science and Technology Facilities Council of the United Kingdom; Higher Education Funding Council for England; National Center for Supercomputing Applications at the University of Illinois at Urbana-Champaign; Kavli Institute of Cosmological Physics at the University of Chicago; Center for Cosmology and Astro-Particle Physics at the Ohio State University; Mitchell Institute for Fundamental Physics and Astronomy at Texas AM University; Financiadora de Estudos e Projetos; Fundacao Carlos Chagas Filho de Amparo; Fundacao Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro; Conselho Nacional de Desenvolvimento Cientfico e Tecnologico and the Ministerio da Ciencia; Tecnologia e Inovacao; Deutsche Forschungsgemeinschaft; Argonne National Laboratory; University of California at Santa Cruz; University of Cambridge; Centro de Investigaciones Energeticas; Medioambientales y Tecnologicas-Madrid; University of Chicago; University College London; DES-Brazil Consortium; University of Edinburgh; Eidgenssische Technische Hochschule (ETH) Zurich; Fermi National Accelerator Laboratory; University of Illinois at Ludwig-Maximilians Universitat Munchen; associated Excellence Cluster Universe; University of Michigan; National Optical Astronomy Observatory; University of Nottingham; Ohio State University; University of Pennsylvania; University of Portsmouth; SLAC National Accelerator Laboratory; Stanford University; University of Sussex; Texas AM University; National Aeronautics and Space Administration; National Science Foundation
importub
2020-04-19T23:31:01+00:00
filename=package.tar
710e29f6d6e0d4e451d9d556b2066f55
David L. Nidever
Knut Olsen
Alistair R. Walker
A. Katherina Vivas
Robert D. Blum
Catherine Kaleida
Yumi Choi
Blair C. Conn
Robert A. Gruendl
Eric F. Bell
Gurtina Besla
Ricardo R. Munoz
Carme Gallart
Nicolas F. Martin
Edward W. Olszewski
Abhijit Saha
Antonela Monachesi
Matteo Monelli
Thomas J. L. de Boer
L. Clifton Johnson
Dennis Zaritsky
Guy S. Stringfellow
Roeland P. van der Marel
Maria-Rosa L. Cioni
Shoko Jin
Steven R. Majewski
David Martinez-Delgado
Lara Monteagudo
Noelia E. D. Noel
Edouard J. Bernard
Andrea Kunder
You-Hua Chu
Cameron P. M. Bell
Felipe Santana
Joshua Frechem
Gustavo E. Medina
Vaishali Parkash
J. C. Seron Navarrete
Christian Hayes
eng
uncontrolled
galaxies: dwarf
eng
uncontrolled
galaxies: individual (Large Magellanic Cloud, Small Magellanic Cloud)
eng
uncontrolled
Local Group
eng
uncontrolled
Magellanic Clouds
eng
uncontrolled
surveys
Institut für Physik und Astronomie
Referiert
Import
45646
2016
2016
eng
67
75
16
586
article
EDP Sciences
Les Ulis
1
--
--
--
XVII. Proper motions of the Small Magellanic Cloud and the Milky Way globular cluster 47 Tucanae
Aims. In this study we use multi-epoch near-infrared observations from the VISTA survey of the Magellanic Cloud system (VMC) to measure the proper motions of different stellar populations in a tile of 1.5 deg2 in size in the direction of the Galactic globular cluster 47 Tuc. We obtain the proper motion of the cluster itself, of the Small Magellanic Cloud (SMC), and of the field Milky Way stars.
Methods. Stars of the three main stellar components are selected according to their spatial distributions and their distributions in colour−magnitude diagrams. Their average coordinate displacement is computed from the difference between multiple Ks-band observations for stars as faint as Ks = 19 mag. Proper motions are derived from the slope of the best-fitting line among ten VMC epochs over a time baseline of ~1 yr. Background galaxies are used to calibrate the absolute astrometric reference frame.
Results. The resulting absolute proper motion of 47 Tuc is (μαcos(δ), μδ) = (+7.26 ± 0.03, −1.25 ± 0.03) mas yr-1. This measurement refers to about 35 000 sources distributed between 10′ and 60′ from the cluster centre. For the SMC we obtain (μαcos(δ), μδ) = (+1.16 ± 0.07, −0.81 ± 0.07) mas yr-1 from about 5250 red clump and red giant branch stars. The absolute proper motion of the Milky Way population in the line of sight (l = 305.9, b = −44.9) of this VISTA tile is (μαcos(δ), μδ) = (+10.22 ± 0.14, −1.27 ± 0.12) mas yr-1 and has been calculated from about 4000 sources. Systematic uncertainties associated with the astrometric reference system are 0.18 mas yr-1. Thanks to the proper motion we detect 47 Tuc stars beyond its tidal radius.
Physical review : E, Statistical, nonlinear and soft matter physics
10.1051/0004-6361/201527004
1432-0746
wos2016:2019
A77
WOS:000369715900088
Cioni, MRL (reprint author), Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany.; Cioni, MRL (reprint author), Leibnitz Inst Astrophys Potsdam, Sternwarte 16, D-14482 Potsdam, Germany.; Cioni, MRL (reprint author), Univ Hertfordshire, Phys Astron & Math, Coll Lane, Hatfield AL10 9AB, Herts, England., mcioni@aip.de
German Academic Exchange Service; National Natural Science Foundation of China [11373010]; STFC [ST/J001333/1, ST/M001008/1]
importub
2020-03-22T20:16:01+00:00
filename=package.tar
32ae31e98daf9b8c4010927f01ac78f3
Maria-Rosa L. Cioni
Kenji Bekki
Leo Girardi
Richard de Grijs
Mike J. Irwin
Valentin D. Ivanov
Marcella Marconi
Joana M. Oliveira
Andres E. Piatti
Vincenzo Ripepi
Jacco Th. van Loon
eng
uncontrolled
proper motions
eng
uncontrolled
surveys
eng
uncontrolled
Magellanic Clouds
eng
uncontrolled
globular clusters: individual: 47 Tucanae
Institut für Physik und Astronomie
Referiert
Import
45466
2016
2016
eng
12
588
article
EDP Sciences
Les Ulis
1
--
--
--
New quasars behind the Magellanic Clouds. Spectroscopic confirmation of near-infrared selected candidates
Context. Quasi-stellar objects (quasars) located behind nearby galaxies provide an excellent absolute reference system for astrometric studies, but they are difficult to identify because of fore-and background contamination. Deep wide-field, high angular resolution surveys spanning the entire area of nearby galaxies are needed to obtain a complete census of such quasars. Aims. We embarked on a program to expand the quasar reference system behind the Large and the Small Magellanic Clouds, the Magellanic Bridge, and the Magellanic Stream that connects the Clouds with the Milky Way. Methods. Hundreds of quasar candidates were selected based on their near-infrared colors and variability properties from the ongoing public ESO VISTA Magellanic Clouds survey. A subset of 49 objects was followed up with optical spectroscopy. Results. We confirmed the quasar nature of 37 objects (34 new identifications): four are low redshift objects, three are probably stars, and the remaining three lack prominent spectral features for a secure classification. The bona fide quasars, identified from their broad emisison lines, are located as follows: 10 behind the LMC, 13 behind the SMC, and 14 behind the Bridge. The quasars span a redshift range from z similar to 0.5 to z similar to 4.1. Conclusions. Upon completion the VMC survey is expected to yield a total of similar to 1500 quasars with Y < 19.32 mag, J < 19.09 mag, and K-s < 18.04 mag.
Current biology
10.1051/0004-6361/201527398
1432-0746
wos2016:2019
A93
WOS:000373207800105
Ivanov, VD (reprint author), European So Observ, Ave Alonso Cordova 3107, Santiago, Chile.; Ivanov, VD (reprint author), European So Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany., vivanov@eso.org
ESO telescopes at the La Silla Paranal Observatory [092.B-0104(A)]; National Natural Science Foundation of China [11373010]
importub
2020-03-22T18:46:02+00:00
filename=package.tar
2915cf434e2a101445d1ec7d334e3647
Valentin D. Ivanov
Maria-Rosa L. Cioni
Kenji Bekki
Richard de Grijs
Jim Emerson
Brad K. Gibson
Devika Kamath
Jacco Th. van Loon
Andres E. Piatti
Bi-Qing For
eng
uncontrolled
surveys
eng
uncontrolled
infrared: galaxies
eng
uncontrolled
quasars: general
eng
uncontrolled
Magellanic Clouds
Institut für Physik und Astronomie
Referiert
Import