A statistical study of the relation between soft X-ray excess and accretion disk

doi:10.1007/s11433-010-0033-1

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	A statistical study of the relation between soft X-ray excess and accretion disk
	Liu JY(刘杰英)1,2,3 ; Qiao EL(乔二林)1,2 ; Liu, JY (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
发表期刊	SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
	2010-01
卷号	53 期号:Supplement 1 页码:102-105
DOI	10.1007/s11433-010-0033-1
分类号	P172.2
产权排序	第1完成单位
收录类别	SCI
关键词	Accretion: Accretion Disks Ultraviolet: Galaxies X-rays: Galaxies
摘要	To study the origin of the soft X-ray excess, we compile a sample of 94 unobscured, radio-quiet QSOs and Seyfert galaxies with available data from GALEX and ROSAT. We find that 50 sources show strong soft X-ray excess and the other 44 show weak/no soft X-ray excess. Systematic analyses of the data indicate that the difference in soft X-rays is mainly but not only resulting from different accretion rates (in units of Eddington rate). The statistical study of the sources with soft X-ray excess shows that the strength of soft X-ray excess weakly and positively correlates with the Eddington ratio and increases with the increase of the strength of UV radiations relative to the X-rays. Provided that the UV emissions are from the thin disk, the correlations imply that the origin of soft X-ray excess is associated with the thin disk, either by means of Comptonization of the disk photons or in some other ways.
项目资助者	National Basic Research Program of China [2009CB824800] ; National Natural Science Foundation of China [10533050, 10773028]
语种	英语
学科领域	Physics
文章类型	Article
ISSN	1674-7348
URL	查看原文
归档日期	2010-05-24
WOS记录号	WOS:000280291800023
WOS研究方向	Physics
WOS类目	Physics, Multidisciplinary
关键词[WOS]	ACTIVE GALACTIC NUCLEI ; SPECTRAL ENERGY-DISTRIBUTIONS ; XMM-NEWTON ; AGN-I ; CATALOG ; ROSAT ; ULTRAVIOLET ; CAIXA ; BUMP
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/5003
专题	高能天体物理研究组中国科学院天体结构与演化重点实验室
通讯作者	Liu, JY (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
作者单位	1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Science, Kunming, 650011, China 2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, 650011, China 3.Graduate University of Chinese Academy of Sciences, Beijing, 100049, China
第一作者单位	中国科学院云南天文台
推荐引用方式 GB/T 7714	Liu JY,Qiao EL,Liu, JY . A statistical study of the relation between soft X-ray excess and accretion disk[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2010,53(Supplement 1):102-105.
APA	Liu JY,Qiao EL,&Liu, JY .(2010).A statistical study of the relation between soft X-ray excess and accretion disk.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,53(Supplement 1),102-105.
MLA	Liu JY,et al."A statistical study of the relation between soft X-ray excess and accretion disk".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 53.Supplement 1(2010):102-105.

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