Constraining the redshift z≁6 quasar luminosity function using gravitational lensing

被引:39
作者
Comerford, JM
Haiman, Z
Schaye, J
机构
[1] Princeton Univ Observ, Princeton, NJ 08544 USA
[2] Inst Adv Study, Sch Nat Sci, Princeton, NJ 08540 USA
[3] Columbia Univ, Dept Astron, New York, NY 10027 USA
关键词
black hole physics; cosmology : observations; cosmology : theory; galaxies : high-redshift; gravitational lensing; quasars : general;
D O I
10.1086/343116
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Recent discoveries by the Sloan Digital Sky Survey (SDSS) of four bright zsimilar to6 quasars could constrain the mechanism by which the supermassive black holes powering these sources are assembled. Here we compute the probability that the fluxes of the quasars are strongly amplified by gravitational lensing and therefore the likelihood that the black hole masses are overestimated when they are inferred assuming Eddington luminosities. The poorly constrained shape of the intrinsic quasar luminosity function (LF) at redshift similar to6 results in a large range of possible lensing probabilities. If the LF is either steep or extends to faint magnitudes, the probability for amplification by a factor mugreater than or similar to10 ( and with only one image detectable by SDSS) can reach essentially 100%. We show that future observations, in particular, of either the current four quasars at the high angular resolution provided by the Hubble Space Telescope or an increased sample of similar to20 zsimilar to6 quasars at the current angular resolution, should either discover several gravitational lenses or else provide interesting new constraints on the shape of the zsimilar to6 quasar LF.
引用
收藏
页码:63 / 72
页数:10
相关论文
共 28 条
[1]  
[Anonymous], 1999, GRAVITATIONAL LENSES
[2]   In the beginning: the first sources of light and the reionization of the universe [J].
Barkana, R ;
Loeb, A .
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 2001, 349 (02) :126-238
[3]   High-redshift galaxies: Their predicted size and surface brightness distributions and their gravitational lensing probability [J].
Barkana, R ;
Loeb, A .
ASTROPHYSICAL JOURNAL, 2000, 531 (02) :613-623
[4]   Evidence for reionization at z ∼ 6:: Detection of a Gunn-Peterson trough in a z=6.28 quasar [J].
Becker, RH ;
Fan, XH ;
White, RL ;
Strauss, MA ;
Narayanan, VK ;
Lupton, RH ;
Gunn, JE ;
Annis, J ;
Bahcall, NA ;
Brinkmann, J ;
Connolly, AJ ;
Csabai, I ;
Czarapata, PC ;
Doi, M ;
Heckman, TM ;
Hennessy, GS ;
Ivezic, Z ;
Knapp, GR ;
Lamb, DQ ;
McKay, TA ;
Munn, JA ;
Nash, T ;
Nichol, R ;
Pier, JR ;
Richards, GT ;
Schneider, DP ;
Stoughton, C ;
Szalay, AS ;
Thakar, AR ;
York, DG .
ASTRONOMICAL JOURNAL, 2001, 122 (06) :2850-2857
[5]   Evolution of the ionizing radiation background and star formation in the aftermath of cosmological reionization [J].
Cen, RY ;
McDonald, P .
ASTROPHYSICAL JOURNAL, 2002, 570 (02) :457-462
[6]   Power spectra for cold dark matter and its variants [J].
Eisenstein, DJ ;
Hu, W .
ASTROPHYSICAL JOURNAL, 1999, 511 (01) :5-15
[7]   High-redshift quasars found in Sloan Digital Sky Survey commissioning data. IV. Luminosity function from the fall equatorial stripe sample [J].
Fan, XH ;
Strauss, MA ;
Schneider, DP ;
Gunn, JE ;
Lupton, RH ;
Becker, RH ;
Davis, M ;
Newman, JA ;
Richards, GT ;
White, RL ;
Anderson, JE ;
Annis, J ;
Bahcall, NA ;
Brunner, RJ ;
Csabai, IN ;
Hennessy, GS ;
Hindsley, RB ;
Fukugita, M ;
Kunszt, PZ ;
Ivezic, Z ;
Knapp, GR ;
McKay, TA ;
Munn, JA ;
Pier, JR ;
Szalay, AS ;
York, DG .
ASTRONOMICAL JOURNAL, 2001, 121 (01) :54-65
[8]   Evolution of the ionizing background and the epoch of reionization from the spectra of z ∼ 6 quasars [J].
Fan, XH ;
Narayanan, VK ;
Strauss, MA ;
White, RL ;
Becker, RH ;
Pentericci, L ;
Rix, HW .
ASTRONOMICAL JOURNAL, 2002, 123 (03) :1247-1257
[9]   A survey of z>5.8 quasars in the Sloan Digital Sky Survey.: I.: Discovery of three new quasars and the spatial density of luminous quasars at z∼6 [J].
Fan, XH ;
Narayanan, VK ;
Lupton, RH ;
Strauss, MA ;
Knapp, GR ;
Becker, RH ;
White, RL ;
Pentericci, L ;
Leggett, SK ;
Haiman, Z ;
Gunn, JE ;
Ivezic, Z ;
Schneider, DP ;
Anderson, SF ;
Brinkmann, J ;
Bahcall, NA ;
Connolly, AJ ;
Csabai, I ;
Doi, M ;
Fukugita, M ;
Geballe, T ;
Grebel, EK ;
Harbeck, D ;
Hennessy, G ;
Lamb, DQ ;
Miknaitis, G ;
Munn, JA ;
Nichol, R ;
Okamura, S ;
Pier, JR ;
Prada, F ;
Richards, GT ;
Szalay, A ;
York, DG .
ASTRONOMICAL JOURNAL, 2001, 122 (06) :2833-2849
[10]   Radiative transfer in a clumpy universe .2. The ultraviolet extragalactic background [J].
Haardt, F ;
Madau, P .
ASTROPHYSICAL JOURNAL, 1996, 461 (01) :20-37