PRIMUS: AN OBSERVATIONALLY MOTIVATED MODEL TO CONNECT THE EVOLUTION OF THE ACTIVE GALACTIC NUCLEUS AND GALAXY POPULATIONS OUT TO z ∼ 1

被引:49
作者
Aird, James [1 ]
Coil, Alison L. [2 ]
Moustakas, John [3 ]
Diamond-Stanic, Aleksandar M. [2 ]
Blanton, Michael R. [4 ]
Cool, Richard J. [5 ]
Eisenstein, Daniel J. [6 ]
Wong, Kenneth C. [7 ]
Zhu, Guangtun [8 ]
机构
[1] Univ Durham, Dept Phys, Durham DH1 3LE, England
[2] Univ Calif San Diego, Dept Phys, Ctr Astrophys & Space Sci, San Diego, CA 92093 USA
[3] Siena Coll, Dept Phys & Astron, Loudonville, NY 12211 USA
[4] NYU, Ctr Cosmol & Particle Phys, Dept Phys, New York, NY 10003 USA
[5] Univ Arizona, MMT Observ, Tucson, AZ 85721 USA
[6] Harvard Coll Observ, Cambridge, MA 02138 USA
[7] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA
[8] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
基金
美国国家科学基金会;
关键词
galaxies: active; galaxies: evolution; X-rays: galaxies; BLACK-HOLE MASS; STAR-FORMATION RATE; QUASAR LUMINOSITY FUNCTION; RAY SELECTED AGN; X-RAY; HOST GALAXIES; STELLAR-MASS; SCALING RELATIONS; EDDINGTON RATIOS; COSMOLOGICAL EVOLUTION;
D O I
10.1088/0004-637X/775/1/41
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present an observationally motivated model to connect the active galactic nucleus (AGN) and galaxy populations at 0.2 < z < 1.0 and predict the AGN X-ray luminosity function (XLF). We start with measurements of the stellar mass function of galaxies (from the Prism Multi-object Survey) and populate galaxies with AGNs using models for the probability of a galaxy hosting an AGN as a function of specific accretion rate. Our model is based on measurements indicating that the specific accretion rate distribution is a universal function across a wide range of host stellar masses with slope gamma(1) approximate to -0.65 and an overall normalization that evolves with redshift. We test several simple assumptions to extend this model to high specific accretion rates (beyond the measurements) and compare the predictions for the XLF with the observed data. We find good agreement with a model that allows for a break in the specific accretion rate distribution at a point corresponding to the Eddington limit, a steep power-law tail to super-Eddington ratios with slope gamma(2) = -2.1(-0.5)(+0.3), and a scatter of 0.38 dex in the scaling between black hole and host stellar mass. Our results show that samples of low luminosity AGNs are dominated by moderately massive galaxies (M* similar to 10(10)-10(11) M-circle dot) growing with a wide range of accretion rates due to the shape of the galaxy stellar mass function rather than a preference for AGN activity at a particular stellar mass. Luminous AGNs may be a severely skewed population with elevated black hole masses relative to their host galaxies and in rare phases of rapid accretion.
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页数:12
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