Intervening broad-line region clouds' effects on the optical/ultraviolet spectrum

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	Intervening broad-line region clouds' effects on the optical/ultraviolet spectrum
	Wang, Y; Ferland, GJ; Hu C(胡晨); Wang JM(王建民); 杜璞;Hu, C; Wang, JM; Du, P
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2012
卷号	424 期号:3 页码:2255-2264
关键词	accretion accretion discs quasars: emission lines quasars: general galaxies: seyfert
英文摘要	Recent X-ray observations of Mrk 766 suggest that broad emission-line region clouds cross our line of sight and produce variable X-ray absorption. Here we investigate what optical/ultraviolet (UV) spectroscopic features would be produced by such intervening broad-line region (BLR) clouds' (IBC) crossing our line of sight to the accretion disc, the source of the optical/UV continuum. Although the emission spectrum produced by intervening clouds is identical to the standard BLR model, they may produce absorption features on the optical or UV continuum. Single clouds will have little effect on the optical/UV spectrum because BLR clouds are likely to be much smaller than the accretion disc. This is unlike the X-ray case, where the radiation source is considerably smaller. However, an ensemble of intervening clouds will produce spectroscopic features in the far-ultraviolet including a strong depression between the Lyman limit and Lya. The amount of the depression will indicate the line-of-sight covering factor of clouds, an unknown quantity that is important for the ionization of the intergalactic medium and the energy budget of active galactic nuclei (AGNs). Comparison with observations suggests that the Spectral Energy Distribution (SED) of Mrk 766 may be affected by IBC that may exist in most of AGNs.
学科主题	Astronomy & Astrophysics
收录类别	SCI
WOS记录号	WOS:000307018300052
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/224196]
专题	高能物理研究所_粒子天体物理中心
推荐引用方式 GB/T 7714	Wang, Y,Ferland, GJ,Hu C,et al. Intervening broad-line region clouds' effects on the optical/ultraviolet spectrum[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2012,424(3):2255-2264.
APA	Wang, Y.,Ferland, GJ.,胡晨.,王建民.,杜璞；Hu, C.,...&Du, P.(2012).Intervening broad-line region clouds' effects on the optical/ultraviolet spectrum.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,424(3),2255-2264.
MLA	Wang, Y,et al."Intervening broad-line region clouds' effects on the optical/ultraviolet spectrum".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 424.3(2012):2255-2264.