TY  - JOUR
A1  - Aleksic, J.
A1  - Ansoldi, S.
A1  - Antonelli, L. A.
A1  - Antoranz, P.
A1  - Babic, A.
A1  - Bangale, P.
A1  - de Almeida, U. Barres
A1  - Barrio, J. A.
A1  - Gonzalez, J. Becerra
A1  - Bednarek, W.
A1  - Bernardini, E.
A1  - Biasuzzi, B.
A1  - Biland, A.
A1  - Blanch Bigas, O.
A1  - Boller, A.
A1  - Bonnefoy, S.
A1  - Bonnoli, G.
A1  - Borracci, F.
A1  - Bretz, T.
A1  - Carmona, E.
A1  - Carosi, A.
A1  - Colin, P.
A1  - Colombo, E.
A1  - Contreras, J. L.
A1  - Cortina, J.
A1  - Covino, S.
A1  - Da Vela, P.
A1  - Dazzi, F.
A1  - De Angelis, A.
A1  - De Caneva, G.
A1  - De Lotto, B.
A1  - Wilhelmi, E. de Ona
A1  - Mendez, C. Delgado
A1  - Prester, Dijana Dominis
A1  - Dorner, D.
A1  - Doro, M.
A1  - Einecke, S.
A1  - Eisenacher, D.
A1  - Elsaesser, D.
A1  - Fonseca, M. V.
A1  - Font, L.
A1  - Frantzen, K.
A1  - Fruck, C.
A1  - Galindo, D.
A1  - Lopez, R. J. Garcia
A1  - Garczarczyk, M.
A1  - Terrats, D. Garrido
A1  - Gaug, M.
A1  - Godinovic, N.
A1  - Munoz, A. Gonzalez
A1  - Gozzini, S. R.
A1  - Hadasch, D.
A1  - Hanabata, Y.
A1  - Hayashida, M.
A1  - Herrera, J.
A1  - Hildebrand, D.
A1  - Hose, J.
A1  - Hrupec, D.
A1  - Hughes, G.
A1  - Idec, W.
A1  - Kadenius, V.
A1  - Kellermann, H.
A1  - Knoetig, M. L.
A1  - Kodani, K.
A1  - Konno, Y.
A1  - Krause, J.
A1  - Kubo, H.
A1  - Kushida, J.
A1  - La Barbera, A.
A1  - Lelas, D.
A1  - Lewandowska, N.
A1  - Lindfors, E.
A1  - Lombardi, S.
A1  - Lopez, M.
A1  - Lopez-Coto, R.
A1  - Lopez-Oramas, A.
A1  - Lorenz, E.
A1  - Lozano, I.
A1  - Makariev, M.
A1  - Mallot, K.
A1  - Maneva, G.
A1  - Mankuzhiyil, N.
A1  - Mannheim, K.
A1  - Maraschi, L.
A1  - Marcote, B.
A1  - Mariotti, M.
A1  - Martinez, M.
A1  - Mazin, D.
A1  - Menzel, U.
A1  - Miranda, J. M.
A1  - Mirzoyan, R.
A1  - Moralejo, A.
A1  - Munar-Adrover, P.
A1  - Nakajima, D.
A1  - Niedzwiecki, A.
A1  - Nilsson, K.
A1  - Nishijima, K.
A1  - Noda, K.
A1  - Orito, R.
A1  - Overkemping, A.
A1  - Paiano, S.
A1  - Palatiello, M.
A1  - Paneque, D.
A1  - Paoletti, R.
A1  - Paredes, J. M.
A1  - Paredes-Fortuny, X.
A1  - Persic, M.
A1  - Moroni, P. G. Prada
A1  - Prandini, E.
A1  - Puljak, I.
A1  - Reinthal, R.
A1  - Rhode, W.
A1  - Ribo, M.
A1  - Rico, J.
A1  - Garcia, J. Rodriguez
A1  - Rugamer, S.
A1  - Saito, T.
A1  - Saito, K.
A1  - Satalecka, K.
A1  - Scalzotto, V.
A1  - Scapin, V.
A1  - Schultz, C.
A1  - Schweizer, T.
A1  - Sun, S.
A1  - Shore, S. N.
A1  - Sillanpaa, A.
A1  - Sitarek, J.
A1  - Snidaric, I.
A1  - Sobczynska, D.
A1  - Spanier, F.
A1  - Stamatescu, V.
A1  - Stamerra, A.
A1  - Steinbring, T.
A1  - Steinke, B.
A1  - Storz, J.
A1  - Strzys, M.
A1  - Takalo, L.
A1  - Takami, H.
A1  - Tavecchio, F.
A1  - Temnikov, P.
A1  - Terzic, T.
A1  - Tescaro, D.
A1  - Teshima, M.
A1  - Thaele, J.
A1  - Tibolla, O.
A1  - Torres, D. F.
A1  - Toyama, T.
A1  - Treves, A.
A1  - Uellenbeck, M.
A1  - Vogler, P.
A1  - Zanin, R.
A1  - Archambault, S.
A1  - Archer, A.
A1  - Beilicke, M.
A1  - Benbow, W.
A1  - Berger, K.
A1  - Bird, R.
A1  - Biteau, Jonathan
A1  - Buckley, J. H.
A1  - Bugaev, V.
A1  - Cerruti, M.
A1  - Chen, Xiaoming
A1  - Ciupik, L.
A1  - Collins-Hughes, E.
A1  - Cui, W.
A1  - Eisch, J. D.
A1  - Falcone, A.
A1  - Feng, Q.
A1  - Finley, J. P.
A1  - Fortin, P.
A1  - Fortson, L.
A1  - Furniss, A.
A1  - Galante, N.
A1  - Gillanders, G. H.
A1  - Griffin, S.
A1  - Gyuk, G.
A1  - Hakansson, Nils
A1  - Holder, J.
A1  - Johnson, C. A.
A1  - Kaaret, P.
A1  - Kar, P.
A1  - Kertzman, M.
A1  - Kieda, D.
A1  - Lang, M. J.
A1  - McArthur, S.
A1  - McCann, A.
A1  - Meagher, K.
A1  - Millis, J.
A1  - Moriarty, P.
A1  - Ong, R. A.
A1  - Otte, A. N.
A1  - Perkins, J. S.
A1  - Pichel, A.
A1  - Pohl, Manuela
A1  - Popkow, A.
A1  - Prokoph, H.
A1  - Pueschel, Elisa
A1  - Ragan, K.
A1  - Reyes, L. C.
A1  - Reynolds, P. T.
A1  - Richards, G. T.
A1  - Roache, E.
A1  - Rovero, A. C.
A1  - Sembroski, G. H.
A1  - Shahinyan, K.
A1  - Staszak, D.
A1  - Telezhinsky, Igor O.
A1  - Tucci, J. V.
A1  - Tyler, J.
A1  - Varlotta, A.
A1  - Wakely, S. P.
A1  - Welsing, R.
A1  - Wilhelm, Alina
A1  - Williams, D. A.
A1  - Buson, S.
A1  - Finke, J.
A1  - Villata, M.
A1  - Raiteri, C.
A1  - Aller, H. D.
A1  - Aller, M. F.
A1  - Cesarini, A.
A1  - Chen, W. P.
A1  - Gurwell, M. A.
A1  - Jorstad, S. G.
A1  - Kimeridze, G. N.
A1  - Koptelova, E.
A1  - Kurtanidze, O. M.
A1  - Kurtanidze, S. O.
A1  - Lahteenmaki, A.
A1  - Larionov, V. M.
A1  - Larionova, E. G.
A1  - Lin, H. C.
A1  - McBreen, B.
A1  - Moody, J. W.
A1  - Morozova, D. A.
A1  - Marscher, A. P.
A1  - Max-Moerbeck, W.
A1  - Nikolashvili, M. G.
A1  - Perri, M.
A1  - Readhead, A. C. S.
A1  - Richards, J. L.
A1  - Ros, J. A.
A1  - Sadun, A. C.
A1  - Sakamoto, T.
A1  - Sigua, L. A.
A1  - Smith, P. S.
A1  - Tornikoski, M.
A1  - Troitsky, I. S.
A1  - Wehrle, A. E.
A1  - Jordan, B.
T1  - Unprecedented study of the broadband emission of Mrk 421 during flaring activity in March 2010
JF  - Astronomy and astrophysics : an international weekly journal
N2  - Context. Because of its proximity, Mrk 421 is one of the best sources on which to study the nature of BL Lac objects. Its proximity allows us to characterize its broadband spectral energy distribution (SED).
 Aims. The goal is to better understand the mechanisms responsible for the broadband emission and the temporal evolution of Mrk 421. These mechanisms may also apply to more distant blazars that cannot be studied with the same level of detail.
 Methods. A flare occurring in March 2010 was observed for 13 consecutive days (from MJD 55 265 to MJD 55 277) with unprecedented wavelength coverage from radio to very high energy (VHE; E > 100 GeV) gamma-rays with MAGIC, VERITAS, Whipple, Fermi-LAT, MAXI, RXTE, Swift, GASP-WEBT, and several optical and radio telescopes. We modeled the day-scale SEDs with one-zone and two-zone synchrotron self-Compton (SSC) models, investigated the physical parameters, and evaluated whether the observed broadband SED variability can be associated with variations in the relativistic particle population.
 Results. The activity of Mrk 421 initially was high and then slowly decreased during the 13-day period. The flux variability was remarkable at the X-ray and VHE bands, but it was minor or not significant at the other bands. The variability in optical polarization was also minor. These observations revealed an almost linear correlation between the X-ray flux at the 2-10 keV band and the VHE gamma-ray flux above 200 GeV, consistent with the gamma-rays being produced by inverse-Compton scattering in the Klein-Nishina regime in the framework of SSC models. The one-zone SSC model can describe the SED of each day for the 13 consecutive days reasonably well, which once more shows the success of this standard theoretical scenario to describe the SEDs of VHE BL Lacs such as Mrk 421. This flaring activity is also very well described by a two-zone SSC model, where one zone is responsible for the quiescent emission, while the other smaller zone, which is spatially separated from the first, contributes to the daily variable emission occurring at X-rays and VHE gamma-rays. The second blob is assumed to have a smaller volume and a narrow electron energy distribution with 3 x 10(4) < gamma < 6 x 10(5), where. is the Lorentz factor of the electrons. Such a two-zone scenario would naturally lead to the correlated variability at the X-ray and VHE bands without variability at the optical/UV band, as well as to shorter timescales for the variability at the X-ray and VHE bands with respect to the variability at the other bands.
 Conclusions. Both the one-zone and the two-zone SSC models can describe the daily SEDs via the variation of only four or five model parameters, under the hypothesis that the variability is associated mostly with the underlying particle population. This shows that the particle acceleration and cooling mechanism that produces the radiating particles might be the main mechanism responsible for the broadband SED variations during the flaring episodes in blazars. The two-zone SSC model provides a better agreement with the observed SED at the narrow peaks of the low-and high-energy bumps during the highest activity, although the reported one-zone SSC model could be further improved by varying the parameters related to the emitting region itself (delta, B and R), in addition to the parameters related to the particle population.
KW  - radiation mechanisms: non-thermal
KW  - galaxies: active
KW  - BL Lacertae objects: individual: Mrk 421
KW  - gamma rays: galaxies
Y1  - 2015
U6  - https://doi.org/10.1051/0004-6361/201424811
SN  - 0004-6361
SN  - 1432-0746
VL  - 578
PB  - EDP Sciences
CY  - Les Ulis
ER  - 
TY  - JOUR
A1  - Garrido, Elisa
T1  - Arte, ciencia y cultura visual en el atlas pintoresco
BT  - vista de la Plaza Mayor de Mexico
JF  - HiN : Alexander von Humboldt im Netz ; International Review for Humboldtian Studies
N2  - Lo pintoresco se puede definir como un sentimiento que invita al espectador de una escena particular a reproducirla en un cuadro, algo que permitió a los viajeros del siglo XIX transportar las imágenes como posesiones, especialmente a través de la publicación de un Atlas Pittoresque. Cada una de esas imágenes es un testimonio de los viajes y sus historias cruzadas. Este es el caso de la lámina III, Vista de la Plaza Mayor de México, que forma parte de la obra Vues des Cordillères et Monuments des Peuples Indigènes de l’Amérique, una imagen que ilustra las redes de intercambio que se sucedían entre artistas y científicos a través de los viajes y expediciones.
N2  - The picturesque can be explained as a feeling that invites the viewer of a particular scene to be reproduced in a frame, which allowed the travellers to move images as possessions, especially through the publication of the Atlas Pittoresque. Each of these images is a testimony of interlinked travelogues. This is the case of the Plate III, Vue de la Grande Place de Mexico in Vues des Cordillères et Monuments des Peuples Indigènes de l’Amérique, an image illustrating the exchange networks that were happening between artists and scientists through the travels and expeditions.
N2  - On peut définir le pittoresque comme un sentiment invitant le spectateur d’une scène particulière à la reproduire dans un tableau, et qui a permis aux voyageurs de transporter les images comme des  possessions, particulièrement vers la publication d’un Atlas Pittoresque. Chacune de ces images est un témoignage des voyages et ses histoires croisées. C‘est le cas de la Planche III, Vue de la Grande Place de Mexico, qu’appartiennent aux Vues des Cordillères et Monuments des Peuples Indigènes de l’Amérique, une image représentant des réseaux d‘échanges entre les artistes et les scientifiques vers les voyages et les expéditions.
KW  - Bildtafeln
KW  - México
KW  - Plaza Mayor
KW  - Reiterstandbild
KW  - Vues des Cordilleres
Y1  - 2015
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-86949
SN  - 1617-5239
SN  - 2568-3543
VL  - XVI
IS  - 30
SP  - 54
EP  - 67
PB  - Universitätsverlag Potsdam
CY  - Potsdam
ER  - 
TY  - JOUR
A1  - Schwarz, Ingo
A1  - Buffon, Giuseppe
A1  - Ette, Ottmar
A1  - Garrido, Elisa
A1  - Heyd, Thomas
A1  - Lundberg, Karin
A1  - Werner, Petra
ED  - Ette, Ottmar
ED  - Knobloch, Eberhard
T1  - HiN : Alexander von Humboldt im Netz
T2  - HIN : Alexander von Humboldt im Netz ; international review for Humboldtian studies
N2  - Ingo Schwarz: „Uebrigens verbleibe ich mit besonderer Werthschätzung Euer gnädiger König“. Zum Briefwechsel Alexander von Humboldts mit Friedrich Wilhelm III. im September 1804

Giuseppe Buffon: The Franciscans in Cathay: memory of men and places. A Contribution for the genealogy of geographical knowledge of Alexander von Humboldt

Ottmar Ette: Icono-grafía, cali-grafía, auto-grafía. Sobre el arte de la visualización en los diarios del viaje americano de Alexander von Humboldt

Elisa Garrido: Arte, ciencia y cultura visual en el atlas pintoresco: Vista de la Plaza Mayor de Mexico

Thomas Heyd: Ascensión al Teide de Alexander von Humboldt

Karin Lundberg: Networking Knowledge: Considering Alexander von Humboldt’s Legacy in a New Shared Space in Education

Petra Werner: In der Naturgeschichte „etwas Höheres suchen“. Zu Humboldts Konzept der Pflanzengeographie
T3  - HiN : Alexander von Humboldt im Netz ; International Review for Humboldtian Studies - XVI.2015, 30 
KW  - Humboldt
KW  - Alexander von Humboldt
KW  - Humboldt-Forschung
KW  - Universität Potsdam
KW  - BBAW
KW  - Alexander von Humboldt auf Reisen
KW  - Brief
KW  - Briefwechsel
KW  - Friedrich Wilhelm III.
KW  - 1804
KW  - Franziskaner
KW  - Geographie
KW  - Epistemologie der Geographie
KW  - Editionsprojekte
KW  - Reisemanuskripte
KW  - Reisetagebücher
KW  - Amerikanische Reisetagebücher
KW  - Vues des Cordilleres
KW  - Vista de las Cordilleras
KW  - Kunstgeschichte
KW  - visual culture
KW  - Bildwissenschaft
KW  - Pico de Teide
KW  - Teneriffa
KW  - Tenerife
KW  - knowledge
KW  - networks
KW  - education
KW  - community college
KW  - East Coast
KW  - USA
KW  - Naturgeschichte
KW  - Pflanzengeographie
Y1  - 2015
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-86895
SN  - 1617-5239
SN  - 2568-3543
VL  - XVI
IS  - 30
PB  - Universitätsverlag Potsdam
CY  - Potsdam
ER  -