Cosmological Evolution of the Hard X-Ray AGN Luminosity Function : Formation History of Supermassive Black Holes(Session 6 : Formation and Evolution of Black Holes)
スポンサーリンク
概要
- 論文の詳細を見る
The cosmological evolution of the hard X-ray luminosity function (HXLF) of Active Galactic Nuclei (AGN) is investigated in the 2-10 keV luminosity range of 10^<41.5> - 10^<46.5> erg s^<-1> as a function of redshift up to 3. From a combination of surveys conducted at photon energies above 2 keV with HEA01, ASCA and Chandra, we construct a highly complete (>96%) sample consisting of 247 AGNs over the wide flux range of 10^<-10> - 3.8 × 10^<-15> erg cm^<-2> s^<-1> (2-10 keV). We find that (i) the fraction of X-ray absorbed AGNs decreases with the intrinsic luminosity and (ii) the evolution of the HXLF of the whole AGNs (including both type-I and type-II AGNs) is best described with a luminosity dependent density evolution where the cutoff redshift increases with the luminosity. Our results directly constrain the evolution of AGNs that produce a major part of the hard X-ray background, thus solving its origin quantitatively. Based on these results, we discuss the formation history of supermassive black holes in galactic centers. The total accreted mass traced by the HXLF with an accretion mass-to-energy conversion factor of 0.1 is consistent with an estimate of SMBH mass density from the demography of galaxies in nearby universe.
- 2004-11-15
著者
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AKIYAMA Masayuki
Subaru Telescope, National Astronomical Observatory of Japan
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Akiyama Masayuki
Astronomical Institute Graduate School Of Science Tohoku University
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Akiyama Masayuki
Subaru Telescope National Astronomical Observatory Of Japan
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Ohta Kouji
Department Of Astronomy Faculty Of Science Kyoto University
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Okita K
Okayama Astrophysical Observatory Naoj
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MIYAJI Takamitsu
Department of Physics, Carnegie Mellon University
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Miyaji Takamitsu
Department Of Physics Carnegie Mellon University
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Ueda Yoshihiro
Institute Of Astronomy National Central University
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Oka Keiko
Department Of Mathematical And Physical Science Japan Women's University
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