| Thème(s) : |
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| Titre : |
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Luminosity function from dedicated SDSS-III and MMT data of quasars in 0.7 < z < 4.0 selected with a new approach |
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| Auteur : |
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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 |
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| Laboratoire : |
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| équipe(s) de recherche : |
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APC - Cosmologie et Gravitation |
| Résumé : |
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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 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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| Collaboration/Projet : |
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SDSS-III |
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| Type de publication : |
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Articles dans des revues avec comité de lecture |
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Date de publication
ou d'écriture : |
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03/2013 |
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| Nom du périodique : |
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| Astronomy and Astrophysics (Astron. Astrophys.) |
| Publisher |
EDP Sciences |
| ISSN |
0004-6361 (eISSN : 1432-0756) |
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| Volume : |
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551 |
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| Page/Article : |
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A29 |
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| Copyright : |
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© ESO, 2013 |
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| Commentaire : |
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14 pages, 13 figs |
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| Mot(s)-clé(s) : |
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quasars: general – dark energy – surveys |
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