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CHANDRA AND MMT OBSERVATIONS OF LOW-MASS BLACK HOLE ACTIVE GALACTIC NUCLEI ACCRETING AT LOW RATES IN DWARF GALAXIES
Yuan, W1; Zhou, H2,3; Dou, L2; Dong XB(董小波)2,4,5; Fan, X6; Wang, TG2
Source PublicationASTROPHYSICAL JOURNAL
2014-02-10
Volume782Issue:1
DOI10.1088/0004-637X/782/1/55
Contribution Rank第4完成单位
Indexed BySCI
KeywordGalaxies: Active Galaxies: Nuclei Galaxies: Seyfert X-rays: Galaxies
Abstract

We report on Chandra X-ray observations of four candidate low-mass black hole (M-bh <= 10(6) M-circle dot) active galactic nuclei (AGNs) that have the estimated Eddington ratios among the lowest (similar to 10(-2)) found for this class. The aims are to validate the nature of their AGNs and to confirm the low Eddington ratios that are derived from the broad H alpha line, and to explore this poorly studied regime in the AGN parameter space. Among them, two objects with the lowest significance of the broad lines are also observed with the Multi-Mirror Telescope, and the high-quality optical spectra taken confirm them as Seyfert 1 AGNs and as having small black hole masses. X-ray emission is detected from the nuclei of two of the galaxies, which is variable on timescales of similar to 10(3) s, whereas no significant (or only marginal at best) detection is found for the remaining two. The X-ray luminosities are on the order of 10(41) erg s(-1) or even lower, on the order of 10(40) erg s(-1) for non-detections, which are among the lowest regimes ever probed for Seyfert galaxies. The low X-ray luminosities, compared to their black hole masses derived from Ha, confirm their low accretion rates assuming typical bolometric corrections. Our results hint at the existence of a possibly large population of under-luminous low-mass black holes in the local universe. An off-nucleus ultra-luminous X-ray source in one of the dwarf galaxies is detected serendipitously, with a luminosity (6-9)x10(39) erg s(-1) in 2-10 keV.

Funding ProjectNSFC[NSF11033007] ; Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences[XDB09000000] ; Alfred P. Sloan Foundation ; Participating Institutions ; National Science Foundation ; U.S. Department of Energy ; National Aeronautics and Space Administration ; Japanese Monbukagakusho ; Max Planck Society ; Higher Education Funding Council for England
Funding OrganizationNSFC[NSF11033007] ; Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences[XDB09000000] ; Alfred P. Sloan Foundation ; Participating Institutions ; National Science Foundation ; U.S. Department of Energy ; National Aeronautics and Space Administration ; Japanese Monbukagakusho ; Max Planck Society ; Higher Education Funding Council for England
Language英语
Subject Area天文学 ; 天体物理学 ; 高能天体物理学 ; 星系与宇宙学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
WOS IDWOS:000331848200055
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordX-RAY-PROPERTIES ; SEYFERT 1 GALAXIES ; EMISSION-LINE ; XMM-NEWTON ; ENERGY-DISTRIBUTION ; NGC 4395 ; VARIABILITY ; NGC-4395 ; SAMPLE ; LUMINOSITY
Citation statistics
Cited Times:19[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5450
Collection丽江天文观测站(南方基地)
中国科学院天体结构与演化重点实验室
Corresponding AuthorYuan, W
Affiliation1.National Astronomical Observatories, Space Science Division, Chinese Academy of Sciences, Beijing 100012, China
2.Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, The University of Sciences and Technology of China, Chinese Academy of Sciences, Hefei, Anhui 230026, China
3.Polar Research Institute of China, Jinqiao Road 451, Shanghai 200136, China
4.Yunnan Astronomical Observatory, Chinese Academy of Sciences, Kunming, Yunnan 650011, China
5.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, Yunnan 650011, China
6.Steward Observatory, The University of Arizona, Tucson, AZ 85721, USA
Recommended Citation
GB/T 7714
Yuan, W,Zhou, H,Dou, L,et al. CHANDRA AND MMT OBSERVATIONS OF LOW-MASS BLACK HOLE ACTIVE GALACTIC NUCLEI ACCRETING AT LOW RATES IN DWARF GALAXIES[J]. ASTROPHYSICAL JOURNAL,2014,782(1).
APA Yuan, W,Zhou, H,Dou, L,Dong XB,Fan, X,&Wang, TG.(2014).CHANDRA AND MMT OBSERVATIONS OF LOW-MASS BLACK HOLE ACTIVE GALACTIC NUCLEI ACCRETING AT LOW RATES IN DWARF GALAXIES.ASTROPHYSICAL JOURNAL,782(1).
MLA Yuan, W,et al."CHANDRA AND MMT OBSERVATIONS OF LOW-MASS BLACK HOLE ACTIVE GALACTIC NUCLEI ACCRETING AT LOW RATES IN DWARF GALAXIES".ASTROPHYSICAL JOURNAL 782.1(2014).
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