Dramatic X-ray spectral variability of a Compton-thick type-1 QSO at z ∼ 1
Dramatic X-ray spectral variability of a Compton-thick type-1 QSO at z ∼ 1
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康普顿厚的 1 型 QSO 在 z ≤ 1 处的显着 X 射线光谱变化
DOI:
10.1093/mnras/sty2208
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发表时间:
2018
影响因子:
4.8
通讯作者:
Schneider, D P
中科院分区:
文献类型:
--
作者:
Simm, T;Buchner, J;Merloni, A;Nandra, K;Shen, Y;Erben, T;Coil, A L;Willmer, C N;Schneider, D P
We report on the discovery of a dramatic X-ray spectral variability event observed in a∼ 1 broad line type-1 QSO. TheXMM-Newtonspectrum from the year 2000 is characterized by an unobscured power-law spectrum with photon index of Γ ∼ 2, a column density of, and no prominent reflection component. Five years later,Chandracaptured the source in a heavily-obscured, reflection-dominated state. The observed X-ray spectral variability could be caused by a Compton-thick cloud witheclipsing the direct emission of the hot corona, implying an extremeNHvariation never before observed in a type-1 QSO. An alternative scenario is a corona that switched off in between the observations. In addition, both explanations require a significant change of the X-ray luminosity prior to the obscuration or fading of the corona and/or a change of the relative geometry of the source/reflector system. Dramatic X-ray spectral variability of this kind could be quite common in type-1 QSOs, considering the relatively few data sets in which such an event could have been identified. Our analysis implies that there may be a population of type-1 QSOs which are Compton-thick in the X-rays when observed at any given time.
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DOI:
--
发表时间:
2003
期刊:
--
影响因子:
--
作者:
T. Giamarchi
通讯作者:
T. Giamarchi
DOI:
10.1086/587475
发表时间:
2007-09
期刊:
The Astrophysical Journal
影响因子:
--
作者:
Yue Shen;J. Greene;M. Strauss;G. Richards;D. Schneider
通讯作者:
Yue Shen;J. Greene;M. Strauss;G. Richards;D. Schneider
DOI:
10.1111/j.1365-2966.2012.21952.x
发表时间:
2012
影响因子:
4.8
作者:
C. Heymans
通讯作者:
C. Heymans
影响因子:
4.8
作者:
G. Miniutti;M. Sanfrutos;T. Beuchert;B. Agís;A. Longinotti;E. Piconcelli;Y. Krongold;M. Guainazzi;Stefano Bianchi;G. Matt;E. Jiménez
通讯作者:
E. Jiménez
DOI:
--
发表时间:
2001
期刊:
影响因子:
--
作者:
T. Miyaji;R. Griffiths
通讯作者:
R. Griffiths