红外冷的赛弗特2星系的光谱观测研究(英文)  

Optical Observations of "cold" Seyfert 2 Galaxies

作　　者：范懿[1] 魏建彦[1] 

机构地区：[1]中国科学院国家天文台,北京100012

出　　处：《天文研究与技术》2003年第S1期25-31,共7页Astronomical Research & Technology

摘　　要：对从Veron活动星系核表 (2 0 0 0 )选取的 4 3个赛弗特 2星系组成的样本的低分辨率光谱进行分析 ,发现一些在Veron活动星系核表中被定义为赛弗特 2星系的源并不符合赛弗特 2星系的分类标准 ,所以根据标准 ,重新对样本进行了分类。分类结果是 :赛弗特 1.9星系占 2 3% (10 / 4 3) ,赛弗特 2星系占 30 % (13/ 4 3) ,LINERs占 7%(3/ 4 3) ,HII区占 5 % (2 / 4 3) ,和混合型光谱占 35 % (15 / 4 3)。我们的结果对Veron表进行了修正。同时考察赛弗特 2星系的α(60 ,2 5) 和 [OⅢ ]/Hβ的相关关系 ,证实了Keel等人 (1994 )年发现的赛弗特 2星系 (热 )相关关系 ,并且将红外颜色的范围从 - 1.5<α(60 ,2 5) <0扩展到$C - 3.5 <α(60 ,2 5) <0的赛弗特 2星系中 ,并讨论了α(60 ,2 5) ～ [OⅢ ]/Hβ的物理机制。We present optical spectra for a sample of 43 Seyfert 2 galaxies selected from the Point Source Catalog of the IRAS Survey and the catalog of quasars and active nuclei (Veron et al. 2000). Our goal is to search for correlations between emission line properties and infrared warmth for the sources and thereby test whether two types of Seyfert 2 galaxies exist. Since not all of the sources selected are 'real' Seyfert 2 galaxies, we have reclassified these galaxies by the emission line ratios. The distribution from Seyfert 1.9 galaxies, Seyfert 2 galaxies, LINERs, HII region and composite spectra are 23%, 30%, 7%, 5% and 35%, respectively. We find that there is a distinct correlation between ionization and dust temperature in both 'warm' and 'cold' Seyfert 2 galaxies, which suggests that there is no evidence for the existence of two types of Seyfert 2 galaxies. The mechanism of the correlation between 5007/Hβ and α (25,60) is also briefly discussed.

关 键 词：光谱观测 活动星系核 外冷 英文 相关关系 低分辨率光谱 VERO 物理机制 国家天文台 分类标准 

分 类 号：P157[天文地球—天文学]