THE X-RAY SPECTRUM OF THE z=6.30 QSO SDSS J1030+0524

被引:27
作者
Farrah, D. [1 ]
Priddey, R. [2 ]
Wilman, R. [3 ]
Haehnelt, M. [4 ]
McMahon, R. [4 ]
机构
[1] CALTECH, Jet Prop Lab, Spitzer Sci Ctr, Pasadena, CA 91125 USA
[2] Univ Hertfordshire, Dept Phys Astron & Math, Hatfield AL10 9AB, Herts, England
[3] Univ Durham, Dept Phys, Sci Labs, Durham DH1 3LE, England
[4] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England
关键词
cosmology: observations; galaxies: formation; galaxies: high-redshift; quasars: individual (SDSS J1030+0524); X-rays: galaxies;
D O I
10.1086/423669
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a deep XMM-Newton observation of the z = 6.30 QSO SDSS J1030+0524, the second most distant quasar currently known. The data contain sufficient counts for spectral analysis, demonstrating the ability of XMM-Newton to measure X-ray spectral shapes of z similar to 6 QSOs with integration times greater than or similar to 100 ks. The X-ray spectrum is well fitted by a power law with index Gamma = 2.12 +/- 0.11, an optical-X-ray spectral slope of alpha(ox) = -1.80, and no absorption excess to the Galactic value, although our data are also consistent with a power-law index in the range 2.02 < Gamma < 2.5 and excess absorption in the range 0 < N-H (cm(-2)) < 8 x 10(22). There is also a H possible detection (similar to 2 sigma) of FeK alpha emission. The X-ray properties of this QSO are, overall, similar to those of lower redshift radio-quiet QSOs. This is consistent with the statement that the X-ray properties of radio-quiet QSOs show no evolution over 0 < z < 6.3. Combined with previous results, this QSO appears indistinguishable in any way from lower redshift QSOs, indicating that QSOs comparable to those seen locally existed less than 1 Gyr after the big bang.
引用
收藏
页码:L13 / L16
页数:4
相关论文
共 41 条
[1]   The formation of the first star in the universe [J].
Abel, T ;
Bryan, GL ;
Norman, ML .
SCIENCE, 2002, 295 (5552) :93-98
[2]  
Arnaud KA, 1996, ASTR SOC P, V101, P17
[3]   Spectral signature of cosmological infall of gas around the first quasars [J].
Barkana, R ;
Loeb, A .
NATURE, 2003, 421 (6921) :341-343
[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]   The Hubble Deep Field North SCUBA Super-map -: I.: Submillimetre maps, sources and number counts [J].
Borys, C ;
Chapman, S ;
Halpern, M ;
Scott, D .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2003, 344 (02) :385-398
[6]   The 2dF QSO Redshift Survey - I. The optical luminosity function of quasi-stellar objects [J].
Boyle, BJ ;
Shanks, T ;
Croom, SM ;
Smith, RJ ;
Miller, L ;
Loaring, N ;
Heymans, C .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2000, 317 (04) :1014-1022
[7]   Exploratory Chandra observations of the three highest redshift quasars known [J].
Brandt, WN ;
Schneider, DP ;
Fan, XH ;
Strauss, MA ;
Gunn, JE ;
Richards, GT ;
Anderson, SF ;
Vanden Berk, DE ;
Bahcall, NA ;
Brinkmann, J ;
Brunner, R ;
Chen, B ;
Hennessy, GS ;
Lamb, DQ ;
Voges, W ;
York, DG .
ASTROPHYSICAL JOURNAL, 2002, 569 (01) :L5-L9
[8]   Star formation-regulated growth of black holes in protogalactic spheroids [J].
Burkert, A ;
Silk, J .
ASTROPHYSICAL JOURNAL, 2001, 554 (02) :L151-L154
[9]   A survey of z&gt;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]   A survey of z&gt;5.7 quasars in the Sloan Digital Sky Survey.: II.: Discovery of three additional quasars at z&gt;6 [J].
Fan, XH ;
Strauss, MA ;
Schneider, DP ;
Becker, RH ;
White, RL ;
Haiman, Z ;
Gregg, M ;
Pentericci, L ;
Grebel, EK ;
Narayanan, VK ;
Loh, YS ;
Richards, GT ;
Gunn, JE ;
Lupton, RH ;
Knapp, GR ;
Ivezic, Z ;
Brandt, WN ;
Collinge, M ;
Hao, L ;
Harbeck, D ;
Prada, F ;
Schaye, J ;
Strateva, I ;
Zakamska, N ;
Anderson, S ;
Brinkmann, J ;
Bahcall, NA ;
Lamb, DQ ;
Okamura, S ;
Szalay, A ;
York, DG .
ASTRONOMICAL JOURNAL, 2003, 125 (04) :1649-1659