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Chinese Academy of Sciences Institutional Repositories Grid
The evolution of chemical abundance in quasar broad line region

文献类型:期刊论文

作者Xu, Fei2,3; Bian, Fuyan3,4; Shen, Yue5; Zuo, Wenwen1; Fan, Xiaohui6; Zhu, Zonghong2
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2018-10-01
卷号480期号:1页码:345-357
ISSN号0035-8711
关键词Galaxies: Abundances Galaxies: Active Galaxies: High Redshift Quasars: Emission Lines
DOI10.1093/nunas/sty1763
英文摘要We study the relation between the metallicity of quasar broad line region (BLR) and black hole (BH) mass (10(7.5)-10(10) M-circle dot) and quasar bolometric luminosity (10(44.6)-10(48) erg s(-1)) using a sample of similar to 130000 quasars at 2.25 <= z <= 5.25 from Sloan Digital Sky Survey Data Release 12 (DR12). We generate composite spectra by stacking individual spectra in the same BH mass (bolometric luminosity) and redshift bins and then estimate the metallicity of quasar BLR using metallicity-sensitive broad emission-line flux ratios based on the photoionization models. We find a significant correlation between quasar BLR metallicity and BH mass (bolometric luminosity) but no correlation between quasar BLR metallicity and redshift. We also compare the metallicity of quasar BLR and that of host galaxies inferred from the mass metallicity relation of star-forming galaxy at z similar to 2.3 and 3.5. We find quasar BLR metallicity is 0.3 similar to 1.0 dex higher than their host galaxies. This discrepancy cannot be interpreted by the uncertainty due to different metallicity diagnostic methods, mass metallicity relation of galaxy, metallicity gradient in quasar host galaxies, BH mass estimation, the effect of different spectral energy distribution models, and a few other potential sources of uncertainties. We propose a possibility that the high metallicity in quasar BLR might be caused by metal enrichment from massive star formation in the nucleus region of quasars or even the accretion disc.
WOS研究方向Astronomy & Astrophysics
语种英语
出版者OXFORD UNIV PRESS
WOS记录号WOS:000442567900028
源URL[http://119.78.226.72/handle/331011/32257]  
专题中国科学院上海天文台
通讯作者Xu, Fei; Bian, Fuyan
作者单位1.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
2.Beijing Normal Univ, Dept Astron, 19 Xinjiekou Outer St, Beijing 100875, Peoples R China
3.Australian Natl Univ, Res Sch Astron & Astrophys, Mt Stromlo Observ, Canberra, ACT 2611, Australia
4.European Southern Observ, Alonso de Cordova 3107,Casilla 19001, Santiago 19, Chile
5.Univ Illinois, Dept Astron, 1002 W Green St, Urbana, IL 61801 USA
6.Univ Arizona, Steward Observ, 933 N Cherry Ave, Tucson, AZ 85719 USA
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Xu, Fei,Bian, Fuyan,Shen, Yue,et al. The evolution of chemical abundance in quasar broad line region[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,480(1):345-357.
APA Xu, Fei,Bian, Fuyan,Shen, Yue,Zuo, Wenwen,Fan, Xiaohui,&Zhu, Zonghong.(2018).The evolution of chemical abundance in quasar broad line region.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,480(1),345-357.
MLA Xu, Fei,et al."The evolution of chemical abundance in quasar broad line region".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 480.1(2018):345-357.

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