THE EVOLUTION OF THE DUSTY TORUS COVERING FACTOR IN QUASARS | |
Gu, Minfeng![]() | |
刊名 | ASTROPHYSICAL JOURNAL
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2013-08-20 | |
卷号 | 773期号:2 |
关键词 | catalogs galaxies: active infrared: general quasars: general |
英文摘要 | We have assembled a large sample of 5996 quasars at 2.0 <= z <= 2.4 (high-z) or 0.7 <= z <= 1.1 (low-z) from the Sloan Digital Sky Survey (SDSS) ninth and seventh data release and quasar catalogs. The spectral energy distributions of quasars were constructed by collecting WISE, UKIDSS, and GALEX photometric data in addition to SDSS data, from which the IR luminosity at 1-7 mu m and bolometric luminosity at 1100 angstrom-1 mu m were calculated. A red tail is clearly seen in the distribution of the spectral index over 1100 angstrom-1 mu m for both the high-z and low-z sources; this tail is likely due to red or reddened quasars. The covering factor (CF) of the dusty torus is estimated as the ratio of the IR luminosity to the bolometric luminosity. We find significant anti-correlations between the CF and the bolometric luminosity, in both the high-z and low-z quasars; however, these two groups follow different tracks. At overlapping bolometric luminosities, the CF of high-z quasars is systematically larger than those of low-z quasars, implying an evolution of the CF with redshift. |
WOS标题词 | Science & Technology ; Physical Sciences |
类目[WOS] | Astronomy & Astrophysics |
研究领域[WOS] | Astronomy & Astrophysics |
关键词[WOS] | ACTIVE GALACTIC NUCLEI ; DIGITAL SKY SURVEY ; SPECTRAL ENERGY-DISTRIBUTIONS ; OSCILLATION SPECTROSCOPIC SURVEY ; DATA RELEASE ; SDSS-III ; STAR-FORMATION ; BLACK-HOLES ; SURVEY. I. ; MILKY-WAY |
收录类别 | SCI |
语种 | 英语 |
WOS记录号 | WOS:000323426100095 |
公开日期 | 2014-09-22 |
内容类型 | 期刊论文 |
源URL | [http://119.78.226.72//handle/331011/15207] ![]() |
专题 | 上海天文台_空间导航与定位技术重点实验室 |
作者单位 | Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China |
推荐引用方式 GB/T 7714 | Gu, Minfeng. THE EVOLUTION OF THE DUSTY TORUS COVERING FACTOR IN QUASARS[J]. ASTROPHYSICAL JOURNAL,2013,773(2). |
APA | Gu, Minfeng.(2013).THE EVOLUTION OF THE DUSTY TORUS COVERING FACTOR IN QUASARS.ASTROPHYSICAL JOURNAL,773(2). |
MLA | Gu, Minfeng."THE EVOLUTION OF THE DUSTY TORUS COVERING FACTOR IN QUASARS".ASTROPHYSICAL JOURNAL 773.2(2013). |
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