THE PREVALENCE OF NARROW OPTICAL Fe II EMISSION LINES IN TYPE 1 ACTIVE GALACTIC NUCLEI

被引：14

作者：

Dong, Xiao-Bo ^{[1
,2
]}

Ho, Luis C. ^{[2
,3
]}

Wang, Jian-Guo ^{[1
,4
,5
]}

Wang, Ting-Gui ^{[1
]}

Wang, Huiyuan ^{[1
]}

Fan, Xiaohui ^{[6
]}

Zhou, Hongyan ^{[1
]}

机构：

[1] Chinese Acad Sci, Univ Sci & Technol China, Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China

[2] Observ Carnegie Inst Sci, Pasadena, CA 91101 USA

[3] Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China

[4] Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 650011, Peoples R China

[5] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

[6] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2010年 / 721卷 / 02期

基金：

美国国家航空航天局; 美国国家科学基金会;

关键词：

accretion; accretion disks; galaxies: active; line: formation; line: identification; quasars: emission lines; radiation mechanisms: general; DIGITAL SKY SURVEY; MOLECULAR-HYDROGEN; STARBURST GALAXIES; DATA RELEASE; QUASARS; SPECTRA; SEYFERT; FEATURES; TORUS; DUST;

D O I：

10.1088/2041-8205/721/2/L143

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

From detailed spectral analysis of a large sample of low-redshift active galactic nuclei (AGNs) selected from the Sloan Digital Sky Survey, we demonstrate-statistically for the first time-that narrow optical Fe II emission lines, both permitted and forbidden, are prevalent in type 1 AGNs. Remarkably, these optical lines are completely absent in type 2 AGNs, across a wide luminosity range, from Seyfert 2 galaxies to type 2 quasars. We suggest that the narrow Fe II-emitting gas is confined to a disk-like geometry in the innermost regions of the narrow-line region on physical scales smaller than the obscuring torus.

引用

页码：L143 / L147

页数：5

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