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A luminosity function of Lyα-emitting galaxies at z ≈ 4.5¹´²

Show simple item record Dawson, Steve Rhoads, James E. Malhotra, Sangeeta Stern, Daniel Wang, JunXian Dey, Arjun Spinrad, Hyron Jannuzi, Buell T. 2008-08-05T18:13:58Z 2008-08-05T18:13:58Z 2007-12-20
dc.identifier.citation The Astrophysical Journal, 671:1227-1240, December 20, 2007 en_US
dc.identifier.clearanceno 07-4339
dc.description.abstract We present a catalog of 59 z ≈ 4:5 Lyα-emitting galaxies spectroscopically confirmed in a campaign of Keck DEIMOS follow-up observations to candidates selected in the Large Area Lyα (LALA) narrowband imaging survey.We targeted 97 candidates for spectroscopic follow-up; by accounting for the variety of conditions under which weperformed spectroscopy, we estimate a selection reliability of ~76%. Together with our previous sample of Keck LRIS confirmations, the 59 sources confirmed herein bring the total catalog to 73 spectroscopically confirmed z ≈ 4:5 Lyα- emitting galaxies in the ≈0.7 deg2 covered by the LALA imaging. As with the Keck LRIS sample, we find that a nonnegligible fraction of the confirmed Ly lines have rest-frame equivalent widths (W rest k ) that exceed the maximum predicted for normal stellar populations: 17%Y31%(93%confidence) of the detected galaxies show Wλ rest >190Ǻ, and 12%Y27% (90% confidence) show Wλ rest Ǻ >240 8. We construct a luminosity function of z ≈ 4:5 Lyα emission lines for comparison to Lyα luminosity functions spanning 3:1 < z < 6:6. We find no significant evidence for Lyα luminosity function evolution from z ≈ 3 to z ≈ 6. This result supports the conclusion that the intergalactic medium remains largely reionized from the local universe out to z ≈ 6:5. It is somewhat at odds with the pronounced drop in the cosmic star formation rate density recently measured between z ~ 3 and z ~ 6 in continuum-selected Lyman-break galaxies, and therefore potentially sheds light on the relationship between the two populations. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher The American Astronomical Society en_US
dc.subject high redshift en_US
dc.subject early universe en_US
dc.subject evolution en_US
dc.subject formation en_US
dc.subject cosmology en_US
dc.subject galaxies
dc.title A luminosity function of Lyα-emitting galaxies at z ≈ 4.5¹´² en_US
dc.type Article en_US

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