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 2,3,4; Luo,B.2,3,4; Brandt,W. N.1,11,12; Brotherton,Michael S.10; Du,Pu 9; Gallagher,S. C.8; Hu,Chen 9; Shemmer,Ohad 7; Wang,Jian-Min 5,6,9
刊名	The Astrophysical Journal
	2019-06-17
卷号	878 期号:2
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	Abstract 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?×?107 M⊙ 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 ～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 (αOX) 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 Γ?≈?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 ≈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.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-878-2-AB1D5B
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/282387]
专题	高能物理研究所_粒子天体物理中心
作者单位	1.Institute for Gravitation and the Cosmos, The Pennsylvania State University, University Park, PA 16802, USA 2.School of Astronomy and Space Science, Nanjing University, Nanjing, Jiangsu 210093, People’s Republic of China 3.Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210093, People’s Republic of China 4.Collaborative Innovation Center of Modern Astronomy and Space Exploration, Nanjing 210093, People’s Republic of China 5.School of Astronomy and Space Science, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, People’s Republic of China 6.National Astronomical Observatories of China, Chinese Academy of Sciences, 20A Datun Road, Beijing 100020, People’s Republic of China 7.Department of Physics, University of North Texas, Denton, TX 76203, USA 8.Department of Physics & Astronomy and Centre for Planetary and Space Exploration, The University of Western Ontario, London, ON, N6A 3K7, Canada 9.Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Beijing 100049, People’s Republic of China 10.Department of Physics and Astronomy, University of Wyoming, Laramie, WY 82071, USA
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]. The Astrophysical Journal,2019,878(2).
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.The Astrophysical Journal,878(2).
MLA	Liu,Hezhen,et al."SDSS J075101.42+291419.1: A Super-Eddington Accreting Quasar with Extreme X-Ray Variability".The Astrophysical Journal 878.2(2019).