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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
2012
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷号424期号:3页码:2255-2264
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.
关键词accretion accretion discs quasars: emission lines quasars: general galaxies: seyfert
学科领域Astronomy & Astrophysics
DOI10.1111/j.1365-2966.2012.21389.x
收录类别SCI
WOS记录号WOS:000307018300052
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被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/224196
专题粒子天体物理中心
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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.
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