The X-ray to optical-UV luminosity ratio of X-ray selected type 1 AGN in XMM-COSMOS

被引：337

作者：

Lusso, E. ^{[1
,2
]}

Comastri, A. ^{[2
]}

Vignali, C. ^{[1
,2
]}

Zamorani, G. ^{[2
]}

Brusa, M. ^{[3
]}

Gilli, R. ^{[2
]}

Iwasawa, K. ^{[2
]}

Salvato, M. ^{[4
]}

Civano, F. ^{[5
]}

Elvis, M. ^{[5
]}

Merloni, A. ^{[3
,6
]}

Bongiorno, A. ^{[3
]}

Trump, J. R. ^{[7
]}

Koekemoer, A. M. ^{[8
]}

Schinnerer, E. ^{[9
]}

Le Floc'h, E. ^{[10
]}

Cappelluti, N. ^{[3
]}

Jahnke, K. ^{[9
]}

Sargent, M. ^{[11
]}

Silverman, J. ^{[11
]}

Mainieri, V. ^{[3
,12
]}

Fiore, F. ^{[13
]}

Bolzonella, M.

Le Fevre, O. ^{[14
]}

Garilli, B. ^{[15
]}

Iovino, A. ^{[16
]}

Kneib, J. P. ^{[14
]}

Lamareille, F. ^{[17
]}

Lilly, S. ^{[11
]}

Mignoli, M. ^{[2
]}

Scodeggio, M. ^{[15
]}

Vergani, D. ^{[1
,2
]}

机构：

[1] Univ Bologna, Dipartimento Astron, I-40127 Bologna, Italy

[2] Osservatorio Astron Bologna, INAF, I-40127 Bologna, Italy

[3] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany

[4] CALTECH, Pasadena, CA 91125 USA

[5] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[6] Excellence Cluster Univ, D-85748 Garching, Germany

[7] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[8] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[9] Max Planck Inst Astron, D-69117 Heidelberg, Germany

[10] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA

[11] ETH, Dept Phys, CH-8093 Zurich, Switzerland

[12] ESO, D-85748 Garching, Germany

[13] Osserv Astron Roma, INAF, I-00040 Monte Porzio Catone, Rm, Italy

[14] Univ Aix Marseille, CNRS, OAMP, Lab Astrophys Marseille, F-13388 Marseille 13, France

[15] INAF IASF, I-20133 Milan, Italy

[16] Osserv Astron Brera, INAF, I-20121 Milan, Italy

[17] Univ Toulouse, CNRS, Lab Astrophys Toulouse Tarbes, F-31400 Toulouse, France

来源：

ASTRONOMY & ASTROPHYSICS | 2010年 / 512卷

关键词：

galaxies: active; Galaxy: evolution; quasars: general; methods: statistical; ACTIVE GALACTIC NUCLEI; DIGITAL SKY SURVEY; QUASI-STELLAR OBJECTS; WIDE-FIELD SURVEY; CHANDRA MULTIWAVELENGTH PROJECT; SPECTRAL ENERGY-DISTRIBUTIONS; HIGH-REDSHIFT QUASARS; ASTRONOMICAL DATA; HOST GALAXIES; RADIO-QUIET;

D O I：

10.1051/0004-6361/200913298

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a study of the X-ray to optical properties of a sample of 545 X-ray selected type 1 AGN, from the XMM-COSMOS survey, over a wide range of redshifts (0.04 < z < 4.25) and X-ray luminosities (40.6 <= Log L([2-10]) (keV) <= 45.3). About 60% of them are spectroscopically identified type 1 AGN, while the others have a reliable photometric redshift and are classified as type 1 AGN on the basis of their multi-band Spectral Energy Distributions. We discuss the relationship between UV and X-ray luminosity, as parameterized by the alpha(ox) spectral slope, and its dependence on redshift and luminosity. We compare our findings with previous investigations of optically selected broad-line AGN (mostly from SDSS). A highly significant correlation between alpha(ox) and L(2500) angstrom is found, in agreement with previous investigations of optically selected samples. We calculate bolometric corrections, k(bol), for the whole sample using hard X-ray luminosities (L([2-10] keV)), and the Eddington ratios for a subsample of 150 objects for which black hole mass estimates are available. We confirm the trend of increasing bolometric correction with increasing Eddington ratio as proposed in previous works. A tight correlation is found between alpha(ox) and k(bol), which can be used to estimate accurate bolometric corrections using only optical and X-ray data. We find a significant correlation between alpha(ox) and Eddington ratio, in which the ratio between X-ray and optical flux decreases with increasing Eddington ratio.

引用

页数：14

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