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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 693531.0, MPI für Astronomie / Publikationen_mpia
Luminosity function from dedicated SDSS-III and MMT data of quasars in 0.7<z<4.0 selected with a new approach
Authors:Palanque-Delabrouille, N.; Magneville, C.; Yeche, C.; Eftekharzadeh, S.; Myers, A. D.; Petitjean, P.; Paris, I.; Aubourg, E.; McGreer, I.; Fan, X.; Dey, A.; Schlegel, D.; Bailey, S.; Bizayev, D.; Bolton, A.; Dawson, K.; Ebelke, G.; Malanushenko, E.; Malanushenko, V.; Oravetz, D.; Pan, K.; Ross, N. P.; Schneider, D. P.; Sheldon, E.; Simmons, A.; Tinker, J.; White, M.; Willmer, C.
Date of Publication (YYYY-MM-DD):2013
Title of Journal:Astronomy and Astrophysics
Start Page:id. A29 (14 pp)
Audience:Not Specified
Abstract / Description: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 previously published results 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.
Free Keywords:Astrophysics - Cosmology and Extragalactic Astrophysics
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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