An accretion disc model for quasar optical variability

	An accretion disc model for quasar optical variability
	Li, Shuang-Liang; Cao, Xinwu
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2008-06-11
卷号	387 期号:1 页码:L41-L44
关键词	accretion galaxies: photometry quasars: general accretion discs
英文摘要	Some different correlations between optical-ultraviolet (UV) variability and other quasar properties, such as luminosity, black hole mass and rest-frame wavelength, were discovered. The positive correlation between optical-UV variability amplitude and black hole mass was first found by Wold et al., and this was confirmed by Wilhite et al. We suggest that the accretion disc model can explain these correlations, provided the optical-UV variability is triggered by the change of accretion rate. The disc temperature of accretion discs decreases with increasing black hole mass, which leads to systematical spectral shape difference with black hole mass even if the black hole is accreting at the same rate m (m = M/M(Edd)). The observed positive correlation between optical-UV variability and black hole mass can be well reproduced by our model calculations, if the mean accretion rate m(0) similar to 0.1 with variation of delta m similar to 0.4-0.5m(0). We also found that the observed correlations of optical-UV variability mplitude with luminosity or rest-frame wavelength can be qualitatively explained by this accretion disc model.
学科主题	星系与宇宙学研究中心
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
收录类别	SCI
语种	英语
WOS记录号	WOS:000256378700055
公开日期	2010-11-08
内容类型	期刊论文
源URL	[http://119.78.226.72//handle/331011/12465]
专题	上海天文台_星系宇宙学重点实验室
作者单位	Chinese Acad Sci, Shanghai Astron Observat, Shanghai 200030, Peoples R China
推荐引用方式 GB/T 7714	Li, Shuang-Liang,Cao, Xinwu. An accretion disc model for quasar optical variability[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2008,387(1):L41-L44.
APA	Li, Shuang-Liang,&Cao, Xinwu.(2008).An accretion disc model for quasar optical variability.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,387(1),L41-L44.
MLA	Li, Shuang-Liang,et al."An accretion disc model for quasar optical variability".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 387.1(2008):L41-L44.