| The Variabilities of the Soft and Hard X—ray Components of NGC 7314 and NGC 7582 and the Distribution of Absorbing Matter in Type Ⅱ AGNs |
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| 引用本文： | Xiang－HuaZou,Sui－JianXue.The Variabilities of the Soft and Hard X—ray Components of NGC 7314 and NGC 7582 and the Distribution of Absorbing Matter in Type Ⅱ AGNs[J].中国天文和天体物理学报,2002,2(4):352-360. |
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| 作者姓名： | Xiang－HuaZou Sui－JianXue |
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| 作者单位： | Xiang-Hua Zou(Department of Astronomy, Peking University, Beijing 100871);Sui-Jian Xue(National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012) |
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| 摘 要： | ASCA observations of the two Type Ⅱ AGNs,NGC7314 and NGC 7582,show clear variations in the broad X-ray band(0.4-10keV)on short timescales-10^4s.Spectral analysis indicates that they bot have an absorbed hard X-ray component and an unabsorbed soft“excess” component.To clarify the origin of the latter,we made a cross-correlation analysis of the two components.The results show that,for NGC7314,the soft X-ray variability is proportional to that of the hard X-ray component.This indicates that the active nucleus of NGC 7314 must be partially covered and so the soft emission is a “leaking” of the variable hard component.For NGC 7582,there is no detectable variability in the soft component, although there is a definite one in the hard component.This indicates that the variable nucleus of NGC 7582 must be fully blocked by absorbing matter,and the soft emission is most likely the scattered component predicted by the AGN unified model.
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| 关 键 词： | 银河系 X射线 AGNs 吸收线 |
The Variabilities of the Soft and Hard X-ray Components of NGC 7314 and NGC 7582 and the Distribution of Absorbing Matter in Type Ⅱ AGNs |
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| Xiang-Hua Zou,Sui-Jian Xue.The Variabilities of the Soft and Hard X-ray Components of NGC 7314 and NGC 7582 and the Distribution of Absorbing Matter in Type Ⅱ AGNs[J].Chinese Journal of Astronomy and Astrophysics,2002,2(4):352-360. |
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| Authors: | Xiang-Hua Zou Sui-Jian Xue |
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| Institution: | [1]DepartmentofAstronomy,PekingUniversity,Beijing100871 [2]NationalAstronomicalObservatories,ChineseAcademyofSciences,Beijing100012 |
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| Abstract: | ASCA observations of the two Type II AGNs, NGC 7314 and NGC 7582,show clear variations in the broad X-ray band (0.4-10keV) on short timescales ～ 104s. Spectral analysis indicates that they both have an absorbed hard X-ray component and an unabsorbed soft "excess" component. To clarify the origin of the latter, we made a cross-correlation analysis of the two components. The results show that, for NGC 7314, the soft X-ray variability is proportional to that of the hard X-ray component. This indicates that the active nucleus of NGC 7314 must be partially covered and so the soft emission is a "leaking" of the variable hard component. For NGC 7582, there is no detectable variability in the soft component,although there is a definite one in the hard component. This indicates that the variable nucleus of NGC 7582 must be fully blocked by absorbing matter, and the soft emission is most likely the scattered component predicted by the AGN unified model. |
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| Keywords: | galaxies: individual (NGC 7314 NGC 7582) - galaxies: X-rays galaxies: variabilities |
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