CHANDRA AND MMT OBSERVATIONS OF LOW-MASS BLACK HOLE ACTIVE GALACTIC NUCLEI ACCRETING AT LOW RATES IN DWARF GALAXIES

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	CHANDRA AND MMT OBSERVATIONS OF LOW-MASS BLACK HOLE ACTIVE GALACTIC NUCLEI ACCRETING AT LOW RATES IN DWARF GALAXIES
	Yuan, W 1; Zhou, H 2,3; Dou, L 2; Dong XB(董小波)2,4,5 ; Fan, X 6; Wang, TG 2
刊名	ASTROPHYSICAL JOURNAL
	2014-02-10
卷号	782 期号:1
关键词	galaxies: active galaxies: nuclei galaxies: Seyfert X-rays: galaxies
ISSN号	0004-637X
通讯作者	Yuan, W (reprint author), Chinese Acad Sci, Div Space Sci, Natl Astron Observ, Beijing 100012, Peoples R China.
产权排序	第四完成单位
英文摘要	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.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	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
收录类别	SCI
原文出处	http://iopscience.iop.org/article/10.1088/0004-637X/782/1/55/meta
语种	英语
WOS记录号	WOS:000331848200055
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5450]
专题	云南天文台_丽江天文观测站（南方基地）云南天文台_中国科学院天体结构与演化重点实验室
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
推荐引用方式 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).