Luminosity function from dedicated SDSS-III and MMT data of quasars in 0.7 < z < 4.0 selected with a new approach

Abstract : We present a measurement of the quasar luminosity function in the range 0.68 < z < 4 down to extinction corrected magnitude gdered = 22.5, using a simple and well understood target selection technique based on the time-variability of quasars. The completeness of our sample was derived directly from a control sample of quasars, without requiring complex simulations of quasar light-curves or colors. A total of 1877 quasar spectra were obtained from dedicated programs on the Sloan telescope (as part of the SDSS-III/BOSS survey) and on the Multiple Mirror Telescope. They allowed us to derive the quasar luminosity function. It agrees well with results previously published in the redshift range 0.68 < z < 2.6. Our deeper data allow us to extend the measurement to z = 4. We measured quasar densities to gdered < 22.5, obtaining 30 QSO per deg2 at z < 1, 99 QSO per deg2 for 1 < z < 2.15, and 47 QSO per deg2 at z > 2.15. Using pure luminosity evolution models, we fitted our LF measurements and predicted quasar number counts as a function of redshift and observed magnitude. These predictions are useful inputs for future cosmology surveys such as those relying on the observation of quasars to measure baryon acoustic oscillations.
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Journal articles
Astronomy and Astrophysics, EDP Sciences, 2013, 551, pp.A29. <10.1051/0004-6361/201220379>


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Contributor : Eric Aubourg <>
Submitted on : Wednesday, October 17, 2012 - 5:30:26 PM
Last modification on : Tuesday, October 28, 2014 - 6:40:07 PM

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N. Palanque-Delabrouille, Ch. Magneville, Ch. Yèche, S. Eftekharzadeh, A. D. Myers, et al.. Luminosity function from dedicated SDSS-III and MMT data of quasars in 0.7 < z < 4.0 selected with a new approach. Astronomy and Astrophysics, EDP Sciences, 2013, 551, pp.A29. <10.1051/0004-6361/201220379>. <in2p3-00742974>

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