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Date and Time of the Query: 2019-04-22 T21:59:57 PDT
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For refcode 2004ApJ...606..683S:
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2004ApJ...606..683S The Abundance of Low-Luminosity Ly{alpha} Emitters at High Redshift Michael R. Santos, Richard S. Ellis, Jean-Paul Kneib, Johan Richard, and Konrad Kuijken Abstract. We derive the luminosity function of high-redshift Ly{alpha}-emitting sources from a deep, blind, spectroscopic survey that utilized strong-lensing magnification by intermediate-redshift clusters of galaxies. We observed carefully selected regions near nine clusters, consistent with magnification factors generally greater than 10 for the redshift range 4.5<z<6.7. Eleven emission-line candidates were located in the range 2.2<z<5.6 whose identification we justify as Ly{alpha}, in most cases via further spectroscopic observations. The selection function we constructed for our survey takes into account our varying intrinsic Ly{alpha} line sensitivity as a function of wavelength and sky position. By virtue of the strong magnification factor, we provide constraints on the Ly{alpha} luminosity function to unprecedented limits of 10^40^ ergs s^-1^, corresponding to a star formation rate of 0.01 M_sun_ yr^-1^. Our cumulative z=~5 Ly{alpha} luminosity function is consistent with a power-law form n(>L) is proportional to L^-1^ over 10^41^ - 10^42.5^ ergs s^-1^. When combined with the results of other surveys, limited at higher luminosities, our results suggest evidence for the suppression of star formation in low-mass halos, as predicted in popular models of galaxy formation. Keywords: Cosmology: Observations, Galaxies: Evolution, Galaxies: Formation, Galaxies: High-Redshift, Galaxies: Luminosity Function, Mass Function, Cosmology: Gravitational Lensing
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