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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; Yuan, W (reprint author), Chinese Acad Sci, Div Space Sci, Natl Astron Observ, Beijing 100012, Peoples R China.
发表期刊ASTROPHYSICAL JOURNAL
2014-02-10
卷号782期号:1
DOI10.1088/0004-637X/782/1/55
产权排序第4完成单位
收录类别SCI
关键词Galaxies: Active Galaxies: Nuclei Galaxies: Seyfert X-rays: Galaxies
摘要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.
项目资助者NSFC [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
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-637X
URL查看原文
WOS记录号WOS:000331848200055
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]X-RAY-PROPERTIES ; SEYFERT 1 GALAXIES ; EMISSION-LINE ; XMM-NEWTON ; ENERGY-DISTRIBUTION ; NGC 4395 ; VARIABILITY ; NGC-4395 ; SAMPLE ; LUMINOSITY
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5450
专题丽江天文观测站(南方基地)
中国科学院天体结构与演化重点实验室
通讯作者Yuan, W (reprint author), Chinese Acad Sci, Div Space Sci, Natl Astron Observ, Beijing 100012, Peoples R China.
作者单位1.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
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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.,...&Yuan, W .(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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