摘要
用国家天文台昆明站1 m光学望远镜和兴隆站2.16 m光学望远镜对塞弗特2型活动星系NGC5953进行了B、V、R三色测光观测,着重研究了星系形态、三个光学波段上的表面亮度轮廓和(B-V)、(B-R)表面色指数分布。结果发现,在NGC 5953星系核的附近偏北方有一个大小约2 kpc、平均光谱型相当于A5的蟹状"蓝区",该"蓝区"伸展出5条旋臂状结构并分别与5组巨电离氢区成协;在NGC5953与邻近的旋涡星系NGC 5954的连接区域存在一个较弱的结构,可能是一个大小约1 kpc、绝对星等约-12.75的矮星系;NGC 5953表面色指数分布重心相对于巨电离氢区分布重心及星系核存在着约0.5 kpc的偏离,这表明了NGC 5953/4的相互作用与NGC 5953中发生的恒星形成有密切相关。
We measured active galaxy NGC 5953 of Seyfert 2 type at B, V,R bands respective- ly, with 1 - m optical telescope at Kunming station and 2.16 - m optical telescope at Xinglong station of the National Astronomical Observatories, Chinese Academy of Sciences, and researched the morphology of the galaxy; surface brightness at B, V, R bands, and distributions of surface - color indices （ B - V） and （ B - R）. Our main results are listed as follows, there is a blue crab -like region with magnitude of 2 kpc and mean spectral type AS, surrounding the nucleus of NGC 5953, which extends five arm -like structures associated with five groups of super-giant HII regions respectively, there is a weak structure in the connecting region of NGC 5953 and an adjacent spiral galaxy NGC 5954, which is probably a dwarf galaxy of d = 1 kpc,Mv = - 12.75, and there is about 0.5 kpc deviation of the distributional centroid of color indices relative to that of super - giant HII regions as well as the nucleus of NGC 5953, which reveals that the interaction between NGC 5953/4 is closely correlated to the star formation happened in NGC 5953.
出处
《大连民族学院学报》
CAS
2008年第3期237-242,共6页
Journal of Dalian Nationalities University
关键词
活动星系
塞弗特
色指数
电离氢区
旋臂
矮星系
相互作用
恒星形成
active galaxy
Seyfert galaxy
morphology
surface brightness
color index
HIIregion
arm
dwarf galaxy
interaction
star formation.
