TY  - JOUR
A1  - Walsh, J. R.
A1  - Monreal-Ibero, A.
A1  - Vílchez, J. M.
A1  - Pérez-Montero, E.
A1  - Iglesias-Páramo, J.
A1  - Sandin, C.
A1  - Relano, M.
A1  - Amorín, R.
T1  - The Wolf-Rayet Population and ISM Interaction in Nearby Starbursts
JF  - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015
N2  - The interaction between massive star formation and gas is a key ingredient in galaxy evolution. Given the level of observational detail currently achievable in nearby starbursts, they constitute ideal laboratories to study interaction process that contribute to global evolution in all types of galaxies. Wolf-Rayet (WR) stars, as an observational marker of high mass star formation, play a pivotal role and their winds can strongly influence the surrounding gas. Imaging spectroscopy of two nearby (<4 Mpc) starbursts, both of which show multiple regions with WR stars, are discussed. The relation between the WR content and the physical and chemical properties of the surrounding ionized gas is explored.
Y1  - 2015
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88339
SP  - 341
EP  - 344
ER  - 
TY  - JOUR
A1  - Wisotzki, Lutz
A1  - Bacon, R.
A1  - Brinchmann, J.
A1  - Cantalupo, S.
A1  - Richter, Philipp
A1  - Schaye, J.
A1  - Schmidt, Kasper Borello
A1  - Urrutia, Tanya
A1  - Weilbacher, Peter Michael
A1  - Akhlaghi, M.
A1  - Bouche, N.
A1  - Contini, T.
A1  - Guiderdoni, B.
A1  - Herenz, E. C.
A1  - Inami, H.
A1  - Kerutt, Josephine Victoria
A1  - Leclercq, F.
A1  - Marino, R. A.
A1  - Maseda, M.
A1  - Monreal-Ibero, A.
A1  - Nanayakkara, T.
A1  - Richard, J.
A1  - Saust, R.
A1  - Steinmetz, Matthias
A1  - Wendt, Martin
T1  - Nearly all the sky is covered by Lyman-alpha emission around high-redshift galaxies
JF  - Nature : the international weekly journal of science
N2  - Galaxies are surrounded by large reservoirs of gas, mostly hydrogen, that are fed by inflows from the intergalactic medium and by outflows from galactic winds. Absorption-line measurements along the lines of sight to bright and rare background quasars indicate that this circumgalactic medium extends far beyond the starlight seen in galaxies, but very little is known about its spatial distribution. The Lyman-alpha transition of atomic hydrogen at a wavelength of 121.6 nanometres is an important tracer of warm (about 104 kelvin) gas in and around galaxies, especially at cosmological redshifts greater than about 1.6 at which the spectral line becomes observable from the ground. Tracing cosmic hydrogen through its Lyman-a emission has been a long-standing goal of observational astrophysics(1-3), but the extremely low surface brightness of the spatially extended emission is a formidable obstacle. A new window into circumgalactic environments was recently opened by the discovery of ubiquitous extended Lyman-alpha emission from hydrogen around high-redshift galaxies(4,5). Such measurements were previously limited to especially favourable systems(6-8) or to the use of massive statistical averaging(9,10) because of the faintness of this emission. Here we report observations of low-surface-brightness Lyman-alpha emission surrounding faint galaxies at redshifts between 3 and 6. We find that the projected sky coverage approaches 100 per cent. The corresponding rate of incidence (the mean number of Lyman-alpha emitters penetrated by any arbitrary line of sight) is well above unity and similar to the incidence rate of high-column-density absorbers frequently detected in the spectra of distant quasars(11-14). This similarity suggests that most circumgalactic atomic hydrogen at these redshifts has now been detected in emission.
Y1  - 2018
U6  - https://doi.org/10.1038/s41586-018-0564-6
SN  - 0028-0836
SN  - 1476-4687
VL  - 562
IS  - 7726
SP  - 229
EP  - 232
PB  - Nature Publ. Group
CY  - London
ER  -