Journal
ASTRONOMY & ASTROPHYSICS
Volume 551, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201220379
Keywords
quasars: general; dark energy; surveys
Categories
Funding
- David and Lucile Packard Fellowship
- NSF [AST 08-06861, AST 11-07682]
- Alfred P. Sloan Foundation
- National Science Foundation
- US Department of Energy Office of Science
- Agence Nationale de la Recherche [ANR-08-BLAN-0222]
- [ANR-11-JS04-011-01]
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We present a measurement of the quasar luminosity function in the range 0.68 < z < 4 down to extinction corrected magnitude g(dered) = 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 g(dered) < 22.5, obtaining 30 QSO per deg(2) at z < 1, 99 QSO per deg(2) for 1 < z < 2.15, and 47 QSO per deg(2) 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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