HOT-DUST-POOR TYPE 1 ACTIVE GALACTIC NUCLEI IN THE COSMOS SURVEY

被引：56

作者：

Hao, Heng ^{[1
]}

Elvis, Martin ^{[1
]}

Civano, Francesca ^{[1
]}

Lanzuisi, Giorgio ^{[1
,2
]}

Brusa, Marcella ^{[3
]}

Lusso, Elisabeta ^{[4
]}

Zamorani, Gianni ^{[4
]}

Comastri, Andrea ^{[4
]}

Bongiorno, Angela ^{[3
]}

Impey, Chris D. ^{[5
]}

Koekemoer, Anton M. ^{[6
]}

Le Floc'h, Emeric ^{[7
]}

Salvato, Mara ^{[8
]}

Sanders, David ^{[7
]}

Trump, Jonathan R. ^{[5
]}

Vignali, Cristian ^{[9
]}

机构：

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

[2] INAF IASF Roma, I-00133 Rome, Italy

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

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

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

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

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

[8] IPP Max Planck Inst Plasma Phys, D-85748 Garching, Germany

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

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2010年 / 724卷 / 01期

关键词：

galaxies: evolution; quasars: general; WIDE-FIELD SURVEY; SPECTRAL ENERGY-DISTRIBUTIONS; X-RAY; MULTIWAVELENGTH PROPERTIES; BLACK-HOLES; QUASARS; GALAXIES; ZCOSMOS; TORI; EVOLUTION;

D O I：

10.1088/2041-8205/724/1/L59

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report a sizable class of type 1 active galactic nuclei (AGNs) with unusually weak near-infrared (1-3 mu m) emission in the XMM-COSMOS type 1 AGN sample. The fraction of these "hot-dust-poor" AGNs increases with redshift from 6% at lowredshift (z < 2) to 20% at moderate high redshift (2 < z < 3.5). There is no clear trend of the fraction with other parameters: bolometric luminosity, Eddington ratio, black hole mass, and X-ray luminosity. The 3 mu m emission relative to the 1 mu m emission is a factor of 2-4 smaller than the typical Elvis et al. AGN spectral energy distribution (SED), which indicates a "torus" covering factor of 2%-29%, a factor of 3-40 smaller than required by unified models. The weak hot dust emission seems to expose an extension of the accretion disk continuum in some of the source SEDs. We estimate the outer edge of their accretion disks to lie at (0.3-2.0) x 10(4) Schwarzschild radii, similar to 10-23 times the gravitational stability radii. Formation scenarios for these sources are discussed.

引用

页码：L59 / L63

页数：5

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