[1]李 峰,袁启荣.星系团Abell 1795的形态和动力学研究[J].南京师大学报(自然科学版),2009,32(02):46-50.
　Li Feng,Yuan Qirong.Study on Dynamics and Morphology of Cluster of Galaxies Abell 1795[J].Journal of Nanjing Normal University(Natural Science Edition),2009,32(02):46-50.
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星系团Abell 1795的形态和动力学研究()
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《南京师大学报（自然科学版）》[ISSN:1001-4616/CN:32-1239/N]

卷:
第32卷
期数:
2009年02期
页码:
46-50
栏目:
物理学
出版日期:
2009-06-30

文章信息/Info

Title:
Study on Dynamics and Morphology of Cluster of Galaxies Abell 1795
作者:
李 峰1;  袁启荣2
1. 江苏工业学院数理学院, 江苏常州213164
2. 南京师范大学物理科学与技术学院, 江苏南京210097
Author(s):
Li Feng1; Yuan Qirong2
1.School of Physics and Mathematics,Jiangsu Polytechnic University,Changzhou 213164,China
关键词:
星系团;  Abe ll 1795;  cD星系;  动力学子结构;  形态
Keywords:
c luster of ga lax ies;  Abell 1795;  cD ga laxy;  dynam ics subc luste r;  m orphology
分类号:
P157.8
摘要:
基于SDSS和NED关于星系团Abell 1795的1.5 h-1Mpc范围内154个成员星系的位置和红移信息,对该团的动力学结构和形态进行了分析.计算出中心cD星系的本动速度为235±72 km.s-1,说明cD星系在星系团完全维里化之前就已经形成.从这些星系的空间投影分布和局域视向速度分布中,发现了正在并合之中的一个子团,进一步说明了该星系团并未处于动力学平衡状态.该星系团中心区域早型星系的比例显著偏高,说明中心区域的恒星形成率偏低.外围区域晚型星系所占的比例略高,可能预示着气体、尘埃等的存在,表现出出恒星形成的活跃. 团星系的空间延展方向和中心cD星系的方位角一致, 在观测上支持了等级成团理论.
Abstract:
Based on the pos ition and redsh ift inform ation o f 154 m em be r ga lax ies of Abe ll 1795 w ith in 1 5 h- 1 M pc from SDSS and NED database, the mo rpho logy and dynam ica l structure o f th is c luste r are ana lyzed. The peculia r ve locity o f the central cD ga laxy is estim ated as 235 72 km s - 1, indicating that the cD ga laxy w as form ed be fo re the com plete v ir ia liza tion. From the spatia l distribution and loca lized ve locity var iation, a subc lusterm ov ing towa rds c luster center is found. The sign ifican t h igh frac tion o f early- type ga lax ies in centra l reg ion suggests low er star form ation in this area. A little h igher fraction o f late- type ga lax ies in outer reg ion seem s to ind ica te ex istence of the gas and dust, wh ich display s an activ e sta r form ation. The extension d irec tion o f cluster g alax ies is consistent w ith the position ang le of the centra l cD ga laxy, wh ich observationa lly supports the h ierachica lm ode l o f c luste r form ation.

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备注/Memo

备注/Memo:
基金项目: 国家自然科学基金( 10778618, 10633020)资助项目.
通讯联系人: 袁启荣, 教授, 博士生导师, 研究方向: 天体物理. E-m ail:yuanqirong@ n jnu. edu. cn
更新日期/Last Update: 2013-04-23