Theory of Accretion Flow in Young Quasars

Mathematics – Logic

Scientific paper

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Scientific paper

Recent theoretical studies on the accretion flow structure and their implications on the cosmological evolutions of quasars are briefly discussed. In the first half, we review the basic flow structure, with particular attention to the importance of (near-)critical accretion flow (the so-called slim disks) in young quasars. The accretion-disk theory predicts that, in contrast with the QSO luminosities which only depend on the mass-accretion rate, dotM, QSO spectra depend also on the black-hole mass, MBH. Thus, LFs at fixed bands should contain the information of black-hole masses of dominant quasar populations at given redshifts. In the second half, we model the disk spectra and calculate QSO luminosity functions (LFs) at NIR/optical/X-ray bands for z = 1 ˜ 3 based on the Press-Schechter formalism. The main results are: (i) The observed LFs at optical and X-rays can be simultaneously reproduced. (ii) The LFs at optical and X-ray bands are not sensitive to MBH, while the LFs at NIR bands are. (iii) The resultant LFs at NIR are dominated by 107 M&sun; black-holes at L ˜ 1044 erg s--1, and by 1011 M&sun; black-holes at L ˜ 1046 erg s-1. Future infrared observations from space (e.g. NGST) will prove cosmological evolution of quasar black holes.

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