| Comparisons of Infrared Colors and Emission-line Intensities between Two types of Seyfert 2 Galaxies |
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| 作者姓名： | Lin-peng Cheng Yong-Heng Zhao |
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| 作者单位： | Lin-Peng Cheng，Yong-Heng Zhao and Jian-Yan WeiNational Astronomical Observatories，Chinese Academy of Sciences，Beijing 100012 |
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| 基金项目： | Chinese NSF (19973014)，the Pandeng Project，the 973 Project (NKBRSF G19990754) are also gratefully acknowledged. |
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| 摘 要： | We study the relation between the infrared colors OⅢ] emission lines,gaseous absorbing column density(NH) ,and the detectability of the polarized (hidden)broad-line region(HBLR) in a large sample of 75 Seyfert 2 galaxies(Sy2s).From the indicators of star-formation activity,f60/f100 and LFIR/LB,we find some evidence that the Sy2s without HBLR show higher star-formation activities than those with HBLR,in agreement with previous prediction.Also,we confirm that the HBLR Sy2s tend to have a larger luminosity ratio of the core to the host galaxy,suggesting that the HBLR Sy2s display more powerful AGN activity.Howerver,the level of obscuration found in previous papers in nearly indistinguishable between the two types of Sy2s.The results support the statement that the non-HBLR Sy2s,with a weaker core component and a stronger star-formation activity component,are intrinsically different from the HBLR Sy2s,which are Sy1 systems with a hidden powerful AGN core and a low star-formation activity.The indications are that the non-HBLR Sy2s might be at an earlier evolutionary phase than the HBLR Sy2s.
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| 关 键 词： | 活动星系 赛佛特星系 偏振 红外线 |
Comparisons of Infrared Colors and Emission-line Intensities between Two types of Seyfert 2 Galaxies |
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| Lin-Peng Cheng,Yong-Heng Zhao,Jian-Yan Wei.Comparisons of Infrared Colors and Emission-line Intensities between Two types of Seyfert 2 Galaxies[J].Chinese Journal of Astronomy and Astrophysics,2002,2(5):408-418. |
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| Authors: | Lin-Peng Cheng Yong-Heng Zhao Jian-Yan Wei |
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| Institution: | NationalAstronomicalObservatories,ChineseAcademyofSciences,Beijing100012 |
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| Abstract: | We study the relation between the infrared colors, OIII] emission lines, gaseous absorbing column density (NH),and the detectability of the polarized (hidden) broad-line region (HBLR) in a large sample of 75 Seyfert 2 galaxies (Sy2s). From the indicators of star-formation activity, f60/f100 and LFIR/LB, we find some evidence that the Sy2s without HBLR show higher star-formation activities than those with HBLR, in agreement with previous prediction. Also, we confirm that the HBLR Sy2s tend to have a larger luminosity ratio of the core to the host galaxy, suggesting that the HBLR Sy2s display more powerful AGN activity. However, the level of obscuration found in previous papers is nearly indistinguishable between the two types of Sy2s. The results support the statement that the non-HBLR Sy2s, with a weaker core component and a stronger star-formation activity component, are intrinsically different from the HBLR Sy2s, which are Sy1 systems with a hidden powerful AGN core and a low star-formation activity. The indications are that the non-HBLR Sy2s might be at an earlier evolutionary phase than the HBLR Sy2s. |
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| Keywords: | galaxies: active - galaxies: Seyfert - polarization - star formation |
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