z ~ 1 Lyα Emitters. I. The Luminosity Function

Type Journal Article
Names Isak G. B. Wold, Amy J. Barger, Lennox L. Cowie
Publication The Astrophysical Journal
Volume 783
Pages 119
Journal Abbreviation The Astrophysical Journal
Date March 1, 2014
DOI 10.1088/0004-637X/783/2/119
ISSN 0004-637X
URL http://adsabs.org/2014ApJ.783.119W
Library Catalog labs.adsabs.harvard.edu
Abstract We construct a flux-limited sample of 135 candidate z ~ 1 Lyα emitters (LAEs) from Galaxy Evolution Explorer (GALEX) grism data using a new data cube search method. These LAEs have luminosities comparable to those at high redshifts and lie within a 7 Gyr gap present in existing LAE samples. We use archival and newly obtained optical spectra to verify the UV redshifts of these LAEs. We use the combination of the GALEX UV spectra, optical spectra, and X-ray imaging data to estimate the active galactic nucleus (AGN) fraction and its dependence on Lyα luminosity. We remove the AGNs and compute the luminosity function (LF) from 60 z ~ 1 LAE galaxies. We find that the best-fit LF implies a luminosity density increase by a factor of ~1.5 from z ~ 0.3 to z ~ 1 and ~20 from z ~ 1 to z ~ 2. We find a z ~ 1 volumetric Lyα escape fraction of 0.7% ± 0.4%. Based in part on data obtained from the Mikulski Archive for Space Telescopes (MAST). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. Support for MAST for non-HST data is provided by the NASA Office of Space Science via grant NNX09AF08G and by other grants and contracts. Based in part on zCOSMOS observations carried out using the Very Large Telescope at the ESO Paranal Observatory under Program ID: LP175.A-0839.
Tags GALAXIES: EVOLUTION, cosmology: observations, galaxies: active, galaxies: distances and redshifts, galaxies: starburst
UW-Madison Astronomy Home