Evolution of Lyα galaxies: Stellar populations at z ∼ 0.3

Steven L. Finkelstein, Seth H. Cohen, Sangeeta Malhotra, James E. Rhoads

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

We present the results of a stellar population analysis of 30 Lyα emitting galaxies (LAEs) at z ∼ 0.3, previously discovered with the Galaxy Evolution Explorer.With a few exceptions, we can accurately fit model spectral energy distributions to these objects, representing the first time this has been done for a large sample of LAEs at z < 3, a gap of ∼8 Gyr in the history of the universe. From the 26/30 LAEs which we can fit, we find an age and stellar mass range of 200 Myr-10 Gyr and 109-1011M, respectively. These objects thus appear to be significantly older and more massive than LAEs at high redshift. We also find that these LAEs show a mild trend toward higher metallicity than those at high redshift, as well as a tighter range of dust attenuation and interstellar medium geometry. These results suggest that low-redshift LAEs have evolved significantly from those at high redshift.

Original languageEnglish (US)
Pages (from-to)276-283
Number of pages8
JournalAstrophysical Journal
Volume700
Issue number1
DOIs
StatePublished - Jul 20 2009

Keywords

  • Fundamental parameters
  • Galaxies: evolution - galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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