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IMPLICATIONS OF INFALLING Fe II-EMITTING CLOUDS IN ACTIVE GALACTIC NUCLEI: ANISOTROPIC PROPERTIES
Ferland, GJ; Hu C(胡晨); Wang JM(王建民); Hu, C; Wang, JM; Baldwin, JA; Porter, RL; van Hoof, PAM; Williams, RJR
2009
发表期刊ASTROPHYSICAL JOURNAL LETTERS
卷号707期号:1页码:L82-L86
通讯作者[Ferland, Gary J.] Univ Kentucky, Dept Phys, Lexington, KY 40506 USA ; [Hu, Chen ; Wang, Jian-Min] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China ; [Wang, Jian-Min] Chinese Acad Sci, TPCSF, Beijing 100864, Peoples R China ; [Baldwin, Jack A.] Michigan State Univ, Dept Astron, Lansing, MI USA ; [Porter, Ryan L.] Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA ; [van Hoof, Peter A. M.] Royal Observ Belgium, B-1180 Brussels, Belgium ; [Williams, R. J. R.] AWE Plc, Reading RG7 4PR, Berks, England
文章类型Article
摘要We investigate consequences of the discovery that Fe II emission in quasars, one of the spectroscopic signatures of "Eigenvector 1," may originate in infalling clouds. Eigenvector 1 correlates with the Eddington ratio L/L(Edd) so that Fe II/H beta increases as L/L(Edd) increases. We show that the " force multiplier," the ratio of gas opacity to electron scattering opacity, is similar to 10(3)-10(4) in Fe II-emitting gas. Such gas would be accelerated away from the central object if the radiation force is able to act on the entire cloud. As had previously been deduced, infall requires that the clouds have large column densities so that a substantial amount of shielded gas is present. The critical column density required for infall to occur depends on L/L(Edd), establishing a link between Eigenvector 1 and the Fe II/H beta ratio. We see predominantly the shielded face of the infalling clouds rather than the symmetric distribution of emitters that has been assumed. The Fe II spectrum emitted by the shielded face is in good agreement with observations thus solving several long-standing mysteries in quasar emission lines.
关键词accretion, accretion disks atomic processes galaxies: active line: formation quasars: emission lines
学科领域Astronomy & Astrophysics
DOI10.1088/0004-637X/707/1/L82
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语种英语
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000272221100018
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文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/240302
专题粒子天体物理中心
作者单位中国科学院高能物理研究所
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Ferland, GJ,Hu C,Wang JM,et al. IMPLICATIONS OF INFALLING Fe II-EMITTING CLOUDS IN ACTIVE GALACTIC NUCLEI: ANISOTROPIC PROPERTIES[J]. ASTROPHYSICAL JOURNAL LETTERS,2009,707(1):L82-L86.
APA Ferland, GJ.,胡晨.,王建民.,Hu, C.,Wang, JM.,...&Williams, RJR.(2009).IMPLICATIONS OF INFALLING Fe II-EMITTING CLOUDS IN ACTIVE GALACTIC NUCLEI: ANISOTROPIC PROPERTIES.ASTROPHYSICAL JOURNAL LETTERS,707(1),L82-L86.
MLA Ferland, GJ,et al."IMPLICATIONS OF INFALLING Fe II-EMITTING CLOUDS IN ACTIVE GALACTIC NUCLEI: ANISOTROPIC PROPERTIES".ASTROPHYSICAL JOURNAL LETTERS 707.1(2009):L82-L86.
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