极亮红外星系样本中的类星体的光谱特征(英文)  

Spectroscopic Properties of QSOs Selected from Ultraluminous Infrared Galaxy Samples

作　　者：郑宪忠[1] 夏晓阳[2] 

机构地区：[1]中国科学院国家天文台,北京100012 [2]天津师范大学

出　　处：《天文研究与技术》2003年第S1期20-24,共5页Astronomical Research & Technology

摘　　要：我们从极亮红外星系样本中选出了由 2 5个类星体组成的红外类星体样本 ,研究其光谱特征。与光学选类星体样本相比 ,红外类星体样本有显著的不同特征。统计结果表明我们的红外类星体中绝大多数为窄线源 (其允许发射线Hβ的半高全宽小于4 0 0 0km/s)。超过 6 0 %的红外类星体可归为亮的窄线赛弗特I星系。超过 70 %的红外类星体有很强或极强的FeⅡ发射线 ,这是目前已知的强FeⅡ线源比例最高的类星体 /赛弗特Ⅰ星系子样本。Hβ宽发射线倾向于有比较明显的蓝翼不对称 ,这一特征很可能与外向流有关。We collected an infrared QSO sample with a total of 25 objects and obtained their optical spectra to investigate their spectroscopic properties. Compared with optically selected sample, the infrared selected sample exhibits remarkably different properties. Statistical analyses show that most infrared QSOs have narrow permitted emission lines (with FWHM of Hβ less than 4000 km s -1 ) and more than 60% of them are luminous narrow line Seyfert 1 galaxies. Moderately or extremely strong Fe Ⅱ emitters take a fraction of more than 70%. This is the highest percentage of strong Fe Ⅱ emitters in all subclasses of QSO/Seyfert 1 samples. The Hβ emission lines in Infrared QSOs are commonly characterized by a blueshifted profile, which is most likely related to outflows, and the blueshift is significantly correlated with the Fe Ⅱ to Hβ line ratio.

关 键 词：类星体 光谱特征 红外星系 样本中 极亮 宽发射线 英文 不对称 国家天文台 天津师范大学 

分 类 号：P158[天文地球—天文学]