Resolving the Lyman-alpha Forest
Bryan, Greg L.
1998-05-27
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45 records were found.
Comment: 14 pages, 9 figures, to appear in the Astrophysical Journal
Comment: Astronomy and Astrophysics Letter - accepted
Comment: 4 pages, 2 figures. Euroconference: Galaxy Evolution III, Kiel,
Germany
Comment: 4 pages, 6 figures. To be published in "Starbursts: From 30 Doradus
to Lyman Break Galaxies", held in Cambridge, ed. R. de Grijs & R. M. Gonzalez
Delgado (Dordrecht: Kluwer)
Comment: 14 pages, 7 figures, 3 tables, to appear in the Astronomical Journal
I Zw 18 is the most metal poor star-forming galaxy known and is an ideal
laboratory to probe stellar evolution theory at low metallicities. Using
archival HST WFPC2 imaging and FOS spectroscopy we were able to improve
previous studies. We constructed a continuum free HeII map, which was used to
identify Wolf-Rayet (WR) stars recently found by ground-based spectroscopy and
to locate diffuse nebular emission. Most of the HeII emission is associated
with the NW stellar cluster, clearly displaced from the surrounding shell-like
[OIII] and Halpha emission. We found evidence for HeII sources, compatible with
5--9 WNL stars and/or compact nebular HeII emission, as well as residual
diffuse emission. Only one of them is outside the NW cluster. We have
calculated evolutionary tracks for massive stars and synthesis models at the
appropriate met...
Comment: 10 pages, appendix with 50 pages available at
http://www.oso.chalmers.se/~duilia/env.html, A&A accepted
Comment: 12 pages, 12 figures, A&A accepted
Comment: 2 pages, 2 figures, in "The Evolution of Galaxies.II. Basic Building
Blocks", M. Sauvage, G. Stasinska, L.Vigroux, D. Schaerer, S. Madden
