METALLICITY AND QUASAR OUTFLOWS

	METALLICITY AND QUASAR OUTFLOWS
	Wang, Huiyuan 1,2; Zhou, Hongyan 1,2,3; Yuan, Weimin4 ; Wang, Tinggui 1,2
刊名	ASTROPHYSICAL JOURNAL LETTERS
	2012-06-01
卷号	751 期号:2
关键词	galaxies: abundances galaxies: nuclei line: formation line: profiles quasars: emission lines quasars: general
英文摘要	Correlations of the outflow strength of quasars, as measured by the blueshift and asymmetry index (BAI) of the C IV line, with intensities and ratios of broad emission lines, based on composite quasar spectra built from the Sloan Digital Sky Survey, are investigated. We find that most of the line ratios of other ions to C IV increase prominently with BAI. These behaviors can be well understood in the context of increasing metallicity with BAI. The strength of the dominant coolant, C IV line, decreases, and weak collisionally excited lines increase with gas metallicity as a result of the competition between different line coolants. Using Si IV + O IV]/C IV as an indicator of gas metallicity, we present, for the first time, a strong correlation between the metallicity and the outflow strength of quasars over a wide range of 1.7-6.9 times solar abundance. Our result implies that metallicity plays an important role in the formation of quasar outflows, likely by affecting outflow acceleration. This effect may have a profound impact on galaxy evolution via momentum feedback and chemical enrichment.
收录类别	SCI
语种	英语
WOS记录号	WOS:000304205000001
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/6124]
专题	国家天文台_空间科学研究部
作者单位	1.Univ Sci & Technol China, Key Lab Res Galaxies & Cosmol, Chinese Acad Sci, Hefei 230026, Anhui, Peoples R China 2.Univ Sci & Technol China, Dept Astron, Hefei 230026, Anhui, Peoples R China 3.Polar Res Inst China, Shanghai 200136, Peoples R China 4.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Wang, Huiyuan,Zhou, Hongyan,Yuan, Weimin,et al. METALLICITY AND QUASAR OUTFLOWS[J]. ASTROPHYSICAL JOURNAL LETTERS,2012,751(2).
APA	Wang, Huiyuan,Zhou, Hongyan,Yuan, Weimin,&Wang, Tinggui.(2012).METALLICITY AND QUASAR OUTFLOWS.ASTROPHYSICAL JOURNAL LETTERS,751(2).
MLA	Wang, Huiyuan,et al."METALLICITY AND QUASAR OUTFLOWS".ASTROPHYSICAL JOURNAL LETTERS 751.2(2012).