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THE z=5 QUASAR LUMINOSITY FUNCTION FROM SDSS STRIPE 82
Journal article   Open access

THE z=5 QUASAR LUMINOSITY FUNCTION FROM SDSS STRIPE 82

Ian D. McGreer, Linhua Jiang, Xiaohui Fan, Gordon T. Richards, Michael A. Strauss, Nicholas P. Ross, Martin White, Yue Shen, Donald P. Schneider, Adam D. Myers, …
The Astrophysical journal, v 768(2), pp 1-25
10 May 2013
url
https://doi.org/10.1088/0004-637x/768/2/105View
Published, Version of Record (VoR)Maybe Open Access (Publisher Bronze) Open
url
https://doi.org/10.1088/0004-637X/768/2/105View
Published, Version of Record (VoR) Open

Abstract

Astronomy & Astrophysics Physical Sciences Science & Technology
We present ameasurement of the Type I quasar luminosity function at z = 5 using a large sample of spectroscopically confirmed quasars selected from optical imaging data. We measure the bright end (M-1450 < -26) with Sloan Digital Sky Survey (SDSS) data covering similar to 6000 deg(2), then extend to lower luminosities (M-1450 < -24) with newly discovered, faint z similar to 5 quasars selected from 235 deg(2) of deep, coadded imaging in the SDSS Stripe 82 region (the celestial equator in the Southern Galactic Cap). The faint sample includes 14 quasars with spectra obtained as ancillary science targets in the SDSS-III Baryon Oscillation Spectroscopic Survey, and 59 quasars observed at the MMT and Magellan telescopes. We construct a well-defined sample of 4.7 < z < 5.1 quasars that is highly complete, with 73 spectroscopic identifications out of 92 candidates. Our color selection method is also highly efficient: of the 73 spectra obtained, 71 are high-redshift quasars. These observations reach below the break in the luminosity function (M*(1450) approximate to -27). The bright-end slope is steep (beta less than or similar to -4), with a constraint of beta < -3.1 at 95% confidence. The break luminosity appears to evolve strongly at high redshift, providing an explanation for the flattening of the bright-end slope reported previously. We find a factor of similar to 2 greater decrease in the number density of luminous quasars (M-1450 < -26) from z = 5 to z = 6 than from z = 4 to z = 5, suggesting a more rapid decline in quasar activity at high redshift than found in previous surveys. Our model for the quasar luminosity function predicts that quasars generate similar to 30% of the ionizing photons required to keep hydrogen in the universe ionized at z = 5.

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