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

文献类型:期刊论文

作者Brandt,W. N.7,8,9; Wang,Jian-Min1,2,5; Shemmer,Ohad3; Hu,Chen5; Gallagher,S. C.4; Du,Pu5; Brotherton,Michael S.6; Luo,B.10,11,12; Liu,Hezhen10,11,12
刊名The Astrophysical Journal
出版日期2019-06-17
卷号878期号:2
ISSN号0004-637X
关键词galaxies: active quasars: individual (SDSS J075101.42+291419.1) X-rays: galaxies
DOI10.3847/1538-4357/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
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.School of Astronomy and Space Science, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, People’s Republic of China
2.National Astronomical Observatories of China, Chinese Academy of Sciences, 20A Datun Road, Beijing 100020, People’s Republic of China
3.Department of Physics, University of North Texas, Denton, TX 76203, USA
4.Department of Physics & Astronomy and Centre for Planetary and Space Exploration, The University of Western Ontario, London, ON, N6A 3K7, Canada
5.Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Beijing 100049, People’s Republic of China
6.Department of Physics and Astronomy, University of Wyoming, Laramie, WY 82071, USA
7.Department of Physics, 104 Davey Lab, The Pennsylvania State University, University Park, PA 16802, USA
8.Institute for Gravitation and the Cosmos, The Pennsylvania State University, University Park, PA 16802, USA
9.Department of Astronomy & Astrophysics, 525 Davey Lab, The Pennsylvania State University, University Park, PA 16802, USA
10.Collaborative Innovation Center of Modern Astronomy and Space Exploration, Nanjing 210093, People’s Republic of China
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GB/T 7714
Brandt,W. N.,Wang,Jian-Min,Shemmer,Ohad,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 Brandt,W. N..,Wang,Jian-Min.,Shemmer,Ohad.,Hu,Chen.,Gallagher,S. C..,...&Liu,Hezhen.(2019).SDSS J075101.42+291419.1: A Super-Eddington Accreting Quasar with Extreme X-Ray Variability.The Astrophysical Journal,878(2).
MLA Brandt,W. N.,et al."SDSS J075101.42+291419.1: A Super-Eddington Accreting Quasar with Extreme X-Ray Variability".The Astrophysical Journal 878.2(2019).

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来源:高能物理研究所

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