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The variability of hardness ratio 1 observed by ROSAT: Narrow-line seyfert 1 galaxies versus broad-line Seyfert 1 galaxies
Cheng, LP; Wei, JY; Zhao, YH
2002-06-01
Source PublicationCHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
Volume2Issue:3Pages:207-215
AbstractWe examined the correlation between the ROSAT Hardness Ratio 1 and Count Rates eight Narrow-line Seyfert 1 Galaxies (NLS1s) and 14 Broad-line Seyfert1 Galaxies (BLS1s). We found that six of the NLS1s show a positive HR1-CTs correlation, and seven of the BLS1s, a negative correlation. The other two NLS1s and seven BLS1s do not show any clear HR1-CTs correlation. Thus, the spectral behavior is statistically different for the NLS1s and BLS1s. The different behaviors can possibly be interpreted in terms of a stable 'soft excess' that is strong in NLS1s and weak in BLS1s, plus a power law component, common to both, which softens with increasing flux.
KeywordGalaxies : Seyfert Galaxies : Active X-ray : Galaxies
Indexed BySCI
Language英语
WOS IDWOS:000176574900003
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8558
Collection空间科学研究部
AffiliationChinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Cheng, LP,Wei, JY,Zhao, YH. The variability of hardness ratio 1 observed by ROSAT: Narrow-line seyfert 1 galaxies versus broad-line Seyfert 1 galaxies[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2002,2(3):207-215.
APA Cheng, LP,Wei, JY,&Zhao, YH.(2002).The variability of hardness ratio 1 observed by ROSAT: Narrow-line seyfert 1 galaxies versus broad-line Seyfert 1 galaxies.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2(3),207-215.
MLA Cheng, LP,et al."The variability of hardness ratio 1 observed by ROSAT: Narrow-line seyfert 1 galaxies versus broad-line Seyfert 1 galaxies".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 2.3(2002):207-215.
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