SDSS J075101.42+291419.1: A Super-Eddington Accreting Quasar with Extreme X-Ray Variability

doi:10.3847/1538-4357/ab1d5b

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	SDSS J075101.42+291419.1: A Super-Eddington Accreting Quasar with Extreme X-Ray Variability
	Liu, Hezhen 1,2,3; Luo, B.1,2,3; Brandt, W. N.4,5,6; Brotherton, Michael S.7; Du, Pu 8; Gallagher, C.9,10; Hu, Chen 8; Shemmer, Ohad 11; Wang, Jian-Min 8,12,13
刊名	ASTROPHYSICAL JOURNAL
	2019-06-20
卷号	878 期号:2 页码:14
关键词	galaxies: active quasars: individual (SDSS J075101.42+291419.1) X-rays: galaxies
ISSN号	0004-637X
DOI	10.3847/1538-4357/ab1d5b
英文摘要	We report the discovery of extreme X-ray variability in a type 1 quasar: SDSS J075101.42+291419.1. It has a black hole (BH) mass of 1.6 x 10(7) M-circle dot measured from reverberation mapping, and the BH is accreting with a super-Eddington accretion rate. Its XMM-Newton observation in 2015 May reveals a flux drop by a factor of similar to 22 with respect to the Swift observation in 2013 May when it showed a typical level of X-ray emission relative to its UV/optical emission. The lack of correlated UV variability results in a steep X-ray-to-optical power-law slope (alpha OX) of -1.97 in the low X-ray flux state, corresponding to an X-ray weakness factor of 36.2 at rest-frame 2 keV relative to its UV/optical luminosity. The mild UV/optical continuum and emission-line variability also suggest that the accretion rate did not change significantly. A single power-law model modified by Galactic absorption describes the 0.3-10 keV spectra of the X-ray observations well in general. The spectral fitting reveals steep spectral shapes with Gamma approximate to 3. We search for active galactic nuclei (AGNs) with such extreme X-ray variability in the literature and find that most of them are narrow-line Seyfert 1 galaxies and quasars with high accretion rates. The fraction of extremely X-ray variable objects among super-Eddington accreting AGNs is estimated to be approximate to 15%-24%. We discuss two possible scenarios, disk reflection and partial covering absorption, to explain the extreme X-ray variability of SDSS J075101.42+291419.1. We propose a possible origin for the partial covering absorber, which is the thick inner accretion disk and its associated outflow in AGNs with high accretion rates.
资助项目	National Natural Science Foundation of China[11673010] ; National Key R&D Program of China[2016YFA0400702] ; National Thousand Young Talents program of China ; NASA ADP grant[80NSSC18K0878] ; NASA CXC grant[GO6-17083X]
WOS关键词	ACTIVE GALACTIC NUCLEI ; LINE SEYFERT-1 GALAXIES ; BLACK-HOLE MASSES ; SPECTRAL ENERGY-DISTRIBUTIONS ; XMM-NEWTON OBSERVATIONS ; PHOTON IMAGING CAMERA ; RADIATION PRESSURE ; TIME VARIABILITY ; COMPLETE SAMPLE ; 1H 0707-495
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000471986500005
资助机构	National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Thousand Young Talents program of China ; National Thousand Young Talents program of China ; NASA ADP grant ; NASA ADP grant ; NASA CXC grant ; NASA CXC grant ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Thousand Young Talents program of China ; National Thousand Young Talents program of China ; NASA ADP grant ; NASA ADP grant ; NASA CXC grant ; NASA CXC grant ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Thousand Young Talents program of China ; National Thousand Young Talents program of China ; NASA ADP grant ; NASA ADP grant ; NASA CXC grant ; NASA CXC grant ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Thousand Young Talents program of China ; National Thousand Young Talents program of China ; NASA ADP grant ; NASA ADP grant ; NASA CXC grant ; NASA CXC grant
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/26595]
专题	中国科学院国家天文台
通讯作者	Liu, Hezhen
作者单位	1.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China 2.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China 3.Collaborat Innovat Ctr Modern Astron & Space Expl, Nanjing 210093, Jiangsu, Peoples R China 4.Penn State Univ, Dept Astron & Astrophys, 525 Davey Lab, University Pk, PA 16802 USA 5.Penn State Univ, Inst Gravitat & Cosmos, University Pk, PA 16802 USA 6.Penn State Univ, Dept Phys, 104 Davey Lab, University Pk, PA 16802 USA 7.Univ Wyoming, Dept Phys & Astron, Laramie, WY 82071 USA 8.Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, 19B Yuquan Rd, Beijing 100049, Peoples R China 9.Univ Western Ontario, Dept Phys & Astron, London, ON N6A 3K7, Canada 10.Univ Western Ontario, Ctr Planetary & Space Explorat, London, ON N6A 3K7, Canada
推荐引用方式 GB/T 7714	Liu, Hezhen,Luo, B.,Brandt, W. N.,et al. SDSS J075101.42+291419.1: A Super-Eddington Accreting Quasar with Extreme X-Ray Variability[J]. ASTROPHYSICAL JOURNAL,2019,878(2):14.
APA	Liu, Hezhen.,Luo, B..,Brandt, W. N..,Brotherton, Michael S..,Du, Pu.,...&Wang, Jian-Min.(2019).SDSS J075101.42+291419.1: A Super-Eddington Accreting Quasar with Extreme X-Ray Variability.ASTROPHYSICAL JOURNAL,878(2),14.
MLA	Liu, Hezhen,et al."SDSS J075101.42+291419.1: A Super-Eddington Accreting Quasar with Extreme X-Ray Variability".ASTROPHYSICAL JOURNAL 878.2(2019):14.