Variability of soft X-ray spectral shape in blazars observed by ROSAT

	Variability of soft X-ray spectral shape in blazars observed by ROSAT
	Cheng, LP; Zhao, YH; Wei, JY
刊名	CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
	2002-04-01
卷号	2 期号:2 页码:117-126
关键词	galaxies : active galaxies : X-ray blazar : spectrum
英文摘要	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.
收录类别	SCI
语种	英语
WOS记录号	WOS:000175150900004
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/8517]
专题	国家天文台_光学天文研究部
作者单位	Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	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.