THE EVOLUTION OF THE DUSTY TORUS COVERING FACTOR IN QUASARS

CORC > 上海天文台 > 中国科学院上海天文台 > 空间导航与定位技术重点实验室

	THE EVOLUTION OF THE DUSTY TORUS COVERING FACTOR IN QUASARS
	Gu, Minfeng
刊名	ASTROPHYSICAL JOURNAL
	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).