| The Variability of Hardness Ratio 1 observed by ROSAT： Narrow—Line Seyfert 1 Galaxies versus Broad—Line Seyfert 1 Galaxies |
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| 引用本文： | Lin－PengCheng,Jian－YanWei,等.The Variability of Hardness Ratio 1 observed by ROSAT： Narrow—Line Seyfert 1 Galaxies versus Broad—Line Seyfert 1 Galaxies[J].中国天文和天体物理学报,2002,2(3):207-215. |
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| 作者姓名： | Lin－PengCheng Jian－YanWei 等 |
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| 作者单位： | Lin-Peng Cheng，Jian-Yan Wei and Yong-Heng ZhaoNational Astronomical Observatories，Chinese Academy of Sciences，Beijing 100012 |
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| 基金项目： | 国家自然科学基金，国家重点基础研究发展计划(973计划) |
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| 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 Seyfert 1 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.
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| 关 键 词： | 银河系 X射线 射电观测 ROSAT NLS1s BLS1s |
The Variability of Hardness Ratio 1 observed by ROSAT:Narrow-Line Seyfert 1 Galaxies versus Broad-Line Seyfert 1 Galaxies |
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| Lin-Peng Cheng,Jian-Yan Wei,Yong-Heng Zhao.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. |
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| Authors: | Lin-Peng Cheng Jian-Yan Wei Yong-Heng Zhao |
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| Institution: | NationalAstronomicalObservatories,ChineseAcademyofSciences,Beijing100012 |
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| Abstract: | We examined the correlation between the ROSAT Hardness Ratio 1 and Count Rates eight Narrow-line Seyfert 1 Galaxies (NLSls) and 14 Broad-line Seyfertl Galaxies (BLSls). We found that six of the NLSls show a positive HR1-CTs correlation, and seven of the BLSls, a negative correlation. The other two NLSls and seven BLSls do not show any clear HR1-CTs correlation. Thus, the spectral behavior is statistically different for the NLSls and BLSls. The different behaviors can possibly be interpreted in terms of a stable 'soft excess' that is strong in NLSls and weak in BLSls, plus a power law component, common to both, which softens with increasing flux. |
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| Keywords: | galaxies: Seyfert - galaxies: active - X-ray: galaxies |
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