THE LUMINOSITY FUNCTION OF FERMI-DETECTED FLAT-SPECTRUM RADIO QUASARS

被引:197
作者
Ajello, M. [1 ,2 ]
Shaw, M. S. [1 ,2 ]
Romani, R. W. [1 ,2 ]
Dermer, C. D. [3 ]
Costamante, L. [1 ,2 ]
King, O. G. [4 ]
Max-Moerbeck, W. [4 ]
Readhead, A. [4 ]
Reimer, A. [1 ,2 ,5 ,6 ]
Richards, J. L. [4 ]
Stevenson, M. [4 ]
机构
[1] Stanford Univ, Dept Phys, Kavli Inst Particle Astrophys & Cosmol, WW Hansen Expt Phys Lab, Stanford, CA 94305 USA
[2] Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA
[3] USN, Res Lab, Div Space Sci, Washington, DC 20375 USA
[4] CALTECH, Cahill Ctr Astron & Astrophys, Pasadena, CA 91125 USA
[5] Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria
[6] Leopold Franzens Univ Innsbruck, Inst Theoret Phys, A-6020 Innsbruck, Austria
基金
美国国家科学基金会;
关键词
cosmology: observations; diffuse radiation; galaxies: active; galaxies: jets; gamma rays: diffuse background; surveys; ACTIVE GALACTIC NUCLEI; LARGE-AREA TELESCOPE; SUPERMASSIVE BLACK-HOLES; ALL-SKY SURVEY; RAY BACKGROUND-RADIATION; BL LACERTAE OBJECTS; GAMMA-RAY; SWIFT-BAT; COSMOLOGICAL EVOLUTION; BLAZAR SEQUENCE;
D O I
10.1088/0004-637X/751/2/108
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Fermi has provided the largest sample of gamma-ray-selected blazars to date. In this work we use a complete sample of flat spectrum radio quasars (FSRQs) detected during the first year of operation to determine the luminosity function (LF) and its evolution with cosmic time. The number density of FSRQs grows dramatically up to redshift similar to 0.5-2.0 and declines thereafter. The redshift of the peak in the density is luminosity dependent, with more luminous sources peaking at earlier times; thus the LF of gamma-ray FSRQs follows a luminosity-dependent density evolution similar to that of radio-quiet active galactic nuclei. Also, using data from the Swift Burst Alert Telescope we derive the average spectral energy distribution (SED) of FSRQs in the 10 keV-300 GeV band and show that there is no correlation between the luminosity at the peak of the gamma-ray emission component and its peak frequency. Using this luminosity-independent SED with the derived LF allows us to predict that the contribution of FSRQs to the Fermi isotropic gamma-ray background is 9.3(-1.0)(+1.6)% (+/-3% systematic uncertainty) in the 0.1-100 GeV band. Finally we determine the LF of unbeamed FSRQs, finding that FSRQs have an average Lorentz factor of gamma = 11.7(-2.2)(+3.3), that most are seen within 5 degrees of the jet axis, and that they represent only similar to 0.1% of the parent population.
引用
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页数:20
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  • [1] GAMMA-RAY LIGHT CURVES AND VARIABILITY OF BRIGHT FERMI-DETECTED BLAZARS
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  • [7] SPECTRAL PROPERTIES OF BRIGHT FERMI-DETECTED BLAZARS IN THE GAMMA-RAY BAND
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  • [8] BRIGHT ACTIVE GALACTIC NUCLEI SOURCE LIST FROM THE FIRST THREE MONTHS OF THE FERMI LARGE AREA TELESCOPE ALL-SKY SURVEY
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  • [9] THE SECOND CATALOG OF ACTIVE GALACTIC NUCLEI DETECTED BY THE FERMI LARGE AREA TELESCOPE
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