Investigating the disk-corona relation in a blue AGN sample

	Investigating the disk-corona relation in a blue AGN sample
	Liu JY(刘杰英)1,2 ; Liu BF(刘碧芳)1
刊名	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2009-09
卷号	9 期号:9 页码:966-978
关键词	accretion: accretion disks galaxies: active X-rays: galaxies
ISSN号	1674-4527
通讯作者	Liu, JY (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	We compile a blue AGN sample from SDSS and investigate how the ratio of hard X-ray to bolometric luminosity depends on the Eddington ratio and black hole mass. Our sample comprises 240 radio-quiet Seyfert 1 galaxies and QSOs. We find that the fraction of hard X-ray luminosity (log(L2-10keV/L-bol)) decreases with an increase of the Eddington ratio. We also find that the fraction of hard X-ray luminosity is independent of the black hole mass for radio-quiet AGNs. The relation of log(L2-10kev/L-bol) decreasing with increasing Eddington ratio indicates that X-ray bolometric correction is not a constant, from a larger sample supporting the results of Vasudevan & Fabian. We interpret our results by the disk corona evaporation/condensation model. In the frame work of this model, Compton cooling becomes efficient in cooling the corona at high accretion rates (in units of Eddington rate), leading to condensation of coronal gas to the disk. Consequently, the relative strength of the corona to the disk becomes weaker at higher Eddington ratios. Therefore, the fraction of hard X-ray emission to disk emission and hence to the bolometric emission is smaller at higher Eddington ratios. The independence of the fraction of hard X-ray luminosity with respect to the mass of the black hole can also be explained by the disk corona model since the coronal structure and luminosity (in units of Eddington luminosity) are independent of the mass of black holes.
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]	ACTIVE GALACTIC NUCLEI ; X-RAY-SPECTRA ; ADVECTION-DOMINATED ACCRETION ; RECONNECTION-HEATED CORONA ; BLACK-HOLE MASSES ; INNER COOL DISKS ; ENERGY-DISTRIBUTIONS ; THIN DISK ; MODEL ; FLOW
收录类别	SCI
原文出处	http://iopscience.iop.org/1674-4527/9/9/003/
语种	英语
WOS记录号	WOS:000270404200003
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4978]
专题	云南天文台_高能天体物理研究组
作者单位	1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China 2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China
推荐引用方式 GB/T 7714	Liu JY,Liu BF. Investigating the disk-corona relation in a blue AGN sample[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2009,9(9):966-978.
APA	Liu JY,&Liu BF.(2009).Investigating the disk-corona relation in a blue AGN sample.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,9(9),966-978.
MLA	Liu JY,et al."Investigating the disk-corona relation in a blue AGN sample".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 9.9(2009):966-978.