WHAT CONTROLS THE Fe II STRENGTH IN ACTIVE GALACTIC NUCLEI?

	WHAT CONTROLS THE Fe II STRENGTH IN ACTIVE GALACTIC NUCLEI?
	Dong, XB1,2 ; Wang JG(王建国)1,3,4,5 ; Ho, LC 2; Wang, TG 1; Fan, XH 6,7; Wang, HY 1; Zhou, HY 1; Yuan WM(袁为民)3,4
刊名	ASTROPHYSICAL JOURNAL
	2011-08-01
卷号	736 期号:2
关键词	accretion, accretion disks galaxies: active line: formation quasars: emission lines quasars: general
ISSN号	0004-637X
通讯作者	Dong, XB (reprint author), Univ Sci & Technol China, Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China.
产权排序	第四完成单位
英文摘要	We used a large, homogeneous sample of 4178 z <= 0.8 Seyfert 1 galaxies and QSOs selected from the Sloan Digital Sky Survey to investigate the strength of Fe II emission and its correlation with other emission lines and physical parameters of active galactic nuclei. We find that the strongest correlations of almost all the emission-line intensity ratios and equivalent widths (EWs) are with the Eddington ratio (L/L-Edd), rather than with the continuum luminosity at 5100 angstrom (L-5100) or black hole mass (M-BH); the only exception is the EW of ultraviolet Fe II emission, which does not correlate at all with broad-line width, L-5100, M-BH, or L/L-Edd. By contrast, the intensity ratios of both the ultraviolet and optical Fe II emission to MgII lambda 2800 correlate quite strongly with L/L-Edd. Interestingly, among all the emission lines in the near-UV and optical studied in this paper (including MgII lambda 2800, H beta, and [O III]lambda 5007), the EW of narrow optical Fe II emission has the strongest correlation with L/L-Edd. We hypothesize that the variation of the emission-line strength in active galaxies is regulated by L/L-Edd because it governs the global distribution of the hydrogen column density of the clouds gravitationally bound in the line-emitting region, as well as its overall gas supply. The systematic dependence on L/L-Edd must be corrected when using the Fe II/MgII intensity ratio as a measure of the Fe/Mg abundance ratio to study the history of chemical evolution in QSO environments.
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]	DIGITAL SKY SURVEY ; BLACK-HOLE MASSES ; LINE SEYFERT-1 GALAXIES ; NEAR-INFRARED SPECTROSCOPY ; QUASI-STELLAR OBJECTS ; BROAD EMISSION-LINES ; EDDINGTON RATIO ; IRON EMISSION ; REVERBERATION MEASUREMENTS ; ENERGY-DISTRIBUTIONS
收录类别	SCI
原文出处	http://iopscience.iop.org/article/10.1088/0004-637X/736/2/86/meta
语种	英语
WOS记录号	WOS:000292977400011
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5009]
专题	云南天文台_高能天体物理研究组云南天文台_中国科学院天体结构与演化重点实验室
作者单位	1.Key Laboratory for Research in Galaxies and Cosmology, The University of Sciences and Technology of China, Chinese Academy of Sciences, Hefei, Anhui 230026, China 2.The Observatories of the Carnegie Institution for Science, Pasadena, CA 91101, USA 3.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China 4.National Astronomical Observatories/Yunnan Observatory and Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China 5.Graduate School of the Chinese Academy of Sciences, Beijing 100039, China 6.Steward Observatory, The University of Arizona, Tucson, AZ 85721, USA 7.Max Planck Institute for Astronomy, D-69120, Heidelberg, Germany
推荐引用方式 GB/T 7714	Dong, XB,Wang JG,Ho, LC,et al. WHAT CONTROLS THE Fe II STRENGTH IN ACTIVE GALACTIC NUCLEI?[J]. ASTROPHYSICAL JOURNAL,2011,736(2).
APA	Dong, XB.,Wang JG.,Ho, LC.,Wang, TG.,Fan, XH.,...&Yuan WM.(2011).WHAT CONTROLS THE Fe II STRENGTH IN ACTIVE GALACTIC NUCLEI?.ASTROPHYSICAL JOURNAL,736(2).
MLA	Dong, XB,et al."WHAT CONTROLS THE Fe II STRENGTH IN ACTIVE GALACTIC NUCLEI?".ASTROPHYSICAL JOURNAL 736.2(2011).