The variability of hardness ratio 1 observed by ROSAT: Narrow-line seyfert 1 galaxies versus broad-line Seyfert 1 galaxies

被引：10

作者：

Cheng, LP ^{[1
]}

Wei, JY ^{[1
]}

Zhao, YH ^{[1
]}

机构：

[1] Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China

来源：

CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS | 2002年 / 2卷 / 03期

关键词：

galaxies : Seyfert; galaxies : active; X-ray : galaxies;

D O I：

10.1088/1009-9271/2/3/207

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We 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.

引用

页码：207 / 215

页数：9