Infrared photometric study of type II quasars

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	Infrared photometric study of type II quasars
	Chen PS(陈培生); Dan HG(单红光)
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2009-03-11
卷号	393 期号:4 页码:1408-1422
关键词	galaxies: photometry quasars: general infrared: galaxies
ISSN号	0035-8711
通讯作者	Chen, PS (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	For this paper, we collected almost all of the type II quasars so far discovered. Among them, 485 sources have photometric data at JHK bands, mainly from Two-Micron All-Sky Survey observations, 65 sources have IRAS photometric data in at least one of the three IRAS bands at 25, 60 and 100 mu m and 15 sources have IRAS photometric data in all three IRAS bands. We find that in nearly half of all type II quasars, both the near-and far-infrared radiations are dominated by starlight or thermal reprocessing of starlight by dust in the underlying galaxy. The infrared radiation of the other group (slightly over half) is dominated by a non-thermal radiation in the near-infrared, and mostly in the far-infrared also (although there is a mixture particularly for the longer wavelengths). It is proposed that for the later group, hidden broad lines may exist in the infrared. On the basis of our and previous results, we also discuss the possibility that there are two distinct classes of type II quasars: 'true' type II quasars without a broad-line region and heavily obscured type I quasars, in full analogy with the case for type II Seyfert galaxies. No relationships can be found for either the near-infrared or the far-infrared colours and the redshift. Correlations between absolute magnitude in the near-and far-infrared with redshift are found, but could be due to a flux limit (Malmquist bias).
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	DIGITAL-SKY-SURVEY ; ACTIVE GALACTIC NUCLEI ; BRIGHT IRAS GALAXIES ; BROAD-LINE REGIONS ; X-RAY SOURCES ; SEYFERT-2 GALAXIES ; CLOSE ENVIRONMENT ; 25-MU-M EMISSION ; SPACE-TELESCOPE ; STAR FORMATION
收录类别	SCI
原文出处	http://mnras.oxfordjournals.org/content/393/4/1408
语种	英语
WOS记录号	WOS:000263758400024
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4232]
专题	云南天文台_其他
作者单位	National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China
推荐引用方式 GB/T 7714	Chen PS,Dan HG. Infrared photometric study of type II quasars[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2009,393(4):1408-1422.
APA	Chen PS,&Dan HG.(2009).Infrared photometric study of type II quasars.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,393(4),1408-1422.
MLA	Chen PS,et al."Infrared photometric study of type II quasars".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 393.4(2009):1408-1422.