The Physical Nature of Lyman Alpha Emitters at z=3.1

Details The Physical Nature of Lyman Alpha Emitters at z=3.1 The Physical Nature of Lyman Alpha Emitters at z=3.1

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.9704g&link_type=abstract

American Astronomical Society Meeting 210, #97.04; Bulletin of the American Astronomical Society, Vol. 39, p.226

Astronomy and Astrophysics

Astrophysics

Scientific paper

Our deep narrow-band imaging of the MUSYC-ECDFS field yielded a complete sample of 162 Lyman Alpha Emitters (LAEs) at z=3.1 with observed EW>80A and emission-line flux>1.5x10-17 ergs/cm2/s. 52 of these LAEs have been confirmed spectroscopically, with no evidence for contamination. We find that these LAEs are predominantly young dust-free galaxies which appear to be undergoing their first burst of star formation. The LAEs typically are dimmer than the R<25.5 Lyman break galaxies, allowing us to probe the bulk of the high-redshift luminosity function. LAEs at z=3.1 have blue continuua, average star formation rates of 6 M&sun;/yr and an average stellar mass of 109 M&sun;. Only 2% of these objects show evidence for AGN via X-ray emission or high-ionization emission lines. We find minimal evidence for LAEs with rest-frame equivalent widths larger than 240A that would be inconsistent with a standard IMF. We will present additional properties of the Lyman Alpha Emitters, including their space density, luminosity function, and cosmic star formation rate density. A data release of images and catalogs is available at http://www.astro.yale.edu/MUSYC .
E.G. acknowledges the support of an NSF Astronomy & Astrophysics Postdoctoral Fellowship (AAPF) and the Yale Astronomy Department.

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