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Astronomy and Astrophysics 551 (2013) A29
Luminosity function from dedicated SDSS-III and MMT data of quasars in 0.7 < z < 4.0 selected with a new approach
N. Palanque-Delabrouille1, Ch. Magneville1, Ch. Yèche1, S. Eftekharzadeh, A. D. Myers, P. Petitjean2, I. Pâris2, E. Aubourg1, 3, I. McGreer, X. Fan, A. Dey, D. Schlegel, S. Bailey, D. Bizayev, A. Bolton, K. Dawson, G. Ebelke, J. Ge, E. Malanushenko, V. Malanushenko, D. Oravetz, K. Pan, N. P. Ross, D. P. Schneider, E. Sheldon, A. Simmons, J. Tinker, M. White, Ch. Willmer
SDSS-III Collaboration(s)

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.
1 :  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
2 :  IAP - Institut d'Astrophysique de Paris
3 :  APC - UMR 7164 - AstroParticule et Cosmologie
APC - Cosmologie et Gravitation
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique
quasars: general – dark energy – surveys
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