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arXiv:astro-ph/0005545 (astro-ph)
[Submitted on 26 May 2000 (v1), last revised 20 Jul 2000 (this version, v2)]

Title:UV excess galaxies: Wolf-Rayet galaxies

Authors:Warren R. Brown, Scott J. Kenyon, Margaret J. Geller, Daniel G. Fabricant
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Abstract: We discuss V and R band photometry for 67% of the Sullivan et al. 2000 SA57 ultraviolet-selected galaxy sample. In a sample of 176 UV-selected galaxies, Sullivan et al. 2000 find that 24% have (UV-B) colors too blue for consistency with starburst spectral synthesis models. We propose that these extreme blue, UV excess galaxies are Wolf-Rayet (WR) galaxies, starburst galaxies with strong UV emission from WR stars. We measure a median (V-R)=0.38+-0.06 for the UV-selected sample, bluer than a sample optically selected at R but consistent with starburst and WR galaxy colors. We demonstrate that redshifted WR emission lines can double or triple the flux through the UV bandpass at high redshifts. Thus the (UV-B) color of a WR galaxy can be up to 1.3 mag bluer at high redshift, and the expected selection function is skewed to larger redshifts. The redshift distribution of the extreme blue, UV excess galaxies matches the selection function we predict from the properties of WR galaxies.
Comments: 4 pages, including 4 figures. Uses AASTeX and this http URL. Includes referee changes
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0005545
  (or arXiv:astro-ph/0005545v2 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0005545
Journal reference: Astrophys.J. 540 (2000) L83
Related DOI: https://doi.org/10.1086/312878

Submission history

From: Warren R. Brown [view email]
[v1] Fri, 26 May 2000 20:57:39 UTC (58 KB)
[v2] Thu, 20 Jul 2000 15:42:08 UTC (64 KB)
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