塞弗特2型星系窄线区的形态  

Morphologies of Narrow-Line Region of Seyfert 2 Galaxies

作　　者：东苏勃[1] 彭志欣[1] 石雷[1] 顾秋生[1] 

机构地区：[1]南京大学天文学系,南京210093

出　　处：《南京大学学报（自然科学版）》2005年第2期204-214,共11页Journal of Nanjing University（Natural Science）

基　　金：国家自然科学基金(10103001);国家973项目(NKBRSFG19990754)

摘　　要：　使用国家天文台兴隆观测站2.16m望远镜的BFOSC相机,对6个塞弗特2型星系进行了窄带成像观测,并获得了它们的[OIII]λ5007和Hα+[NII]λλ6548,6583发射线像以及邻近的连续辐射像,用来研究其窄线区延展电离气体的形态和性质.根据简化的活动星系核的统一模型,假设窄线区气体成球状分布,那么应观测到塞弗特2型星系的窄线区电离气体成V_状(电离锥).但观测表明,只在一些塞弗特2型星系中观测到了电离锥,而在另外一些塞弗特2型星系中观测到了简化的活动星系核统一模型所不能解释的窄线区电离气体的"晕"状形态.结合观测结果,讨论了导致在塞弗特星系中观测到窄线区电离锥和其它不同形态的因素以及对活动星系核统一模型的验证等相关问题.The observational results of 6 Seyfert 2 galaxies with narrow-band filters, the Beijing Faint Object Spectrogragh and Camera (BFOSC) for 2.16 meter telescope of Xinglong Station, NAOC are presented. We have obtained [O_(III)]λ 5 007 and Hα+[N_(II)]λλ 6 548, 6 583 emission line images and nearby continuum images of these galaxies, which are used to investigate the morphology and physical properties of the extended ionized gas of their narrow-line region (NLR). According to the simplified unification model of active galactic nuclei (AGN), assuming that the gas in the NLR is spherically distributed, V-shape morphology (ionization cone) is expected to be observed in Seyfert 2 galaxy. However, ionization cones are only observed in scores of Seyfert 2 galaxes, while in some other Seyfert 2 galaxies, halo-like morphologies are seen, which can not be explained by the simplified unification model of active galactic nuclei. Based on our observation results, we discuss the detectability of various morphologies, including the ionization cones and the implications for the unification model of active galactic nuclei.

关 键 词：塞弗特星系 窄线区 电离锥 活动星系核统一模型 

分 类 号：P157.6[天文地球—天文学]