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Variability of soft X-ray spectral shape in blazars observed by ROSAT
Cheng, LP; Zhao, YH; Wei, JY
2002-04-01
发表期刊CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
卷号2期号:2页码:117-126
摘要In previous paper we have shown that the soft X-ray spectra of two types of Seyfert I galaxies behave statistically differently with increasing intensity. In order to see how the spectrum of blazars changes, we made plots of Hardness Ratio 1 versus Count Rates (HR1-Cts) for 18 blazars observed by ROSAT/PSPC. According to our criteria, ten showed a positive HR1-Cts correlation, two a negative correlation, and the remaining six, no clear correlation. Thus, most blazars of our sample show a hardening spectrum during overall flux increase, though some vary randomly. By investigating the photon index of these objects and different radiation theories, we argue that relative dominance between the synchrotron and inverse Compton emission in the soft X-ray band can well account for the differing spectral behaviours and that the different spectral variations might represent a sequence of synchrotron peaked frequency.
关键词Galaxies : Active Galaxies : X-ray Blazar : Spectrum
收录类别SCI
语种英语
WOS记录号WOS:000175150900004
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文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8517
专题光学天文研究部
作者单位Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
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Cheng, LP,Zhao, YH,Wei, JY. Variability of soft X-ray spectral shape in blazars observed by ROSAT[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2002,2(2):117-126.
APA Cheng, LP,Zhao, YH,&Wei, JY.(2002).Variability of soft X-ray spectral shape in blazars observed by ROSAT.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2(2),117-126.
MLA Cheng, LP,et al."Variability of soft X-ray spectral shape in blazars observed by ROSAT".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 2.2(2002):117-126.
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