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星系团Abell2255的恒星形成性质

Star Formation Properties of Galaxy Cluster Abell2255
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摘要 研究了星系团Abell 2255中184颗成员星系的恒星形成性质.通过对这些星系的形态分类,发现星系光谱在4×10-7m处的跃变程度对区分星系类型非常有效.该星系团中星系的恒星形成活动和星系所处的环境有关,并且不同形态的星系随投影距离的变化趋势遵循不同的规律.此外还确认了团星系的金属丰度与恒星质量之间的相关性,并推断星系团Abell 2255是在单个星系形成后,经过引力相互作用而形成的,这一结果支持了等级成团理论. The star formation properties of 184 galaxies in the galaxy cluster Abell 2255 are studied. Based on a morphological classification of these galaxies, the strength of spectral continuum break at 4×10^-7 m is found to be an effective quantity for galaxy classification. The star formation activity of the galaxies in this galaxy cluster is related with their environment, and the galaxies with different morphologies follow different trends along the projected radial distance. The correlation between metallicity and stellar mass of cluster galaxies is also confirmed. It is concluded that galaxy cluster Abell 2255 is formed by the gravitational interaction after the individual galaxies are formed, which supports the hierarchical model of cluster formation.
作者 赵丽芳 袁启荣
机构地区 南京师范大学物理科学与技术学院
出处 《南京师大学报（自然科学版）》 CAS CSCD 北大核心 2005年第4期46-49,共4页 Journal of Nanjing Normal University(Natural Science Edition)
基金 国家自然科学基金资助项目(10273007)
关键词 星系团 星系 恒星形成率 恒星质量 金属丰度 galaxy cluster, galaxy, star formation rate, stellar mass, metallicity
分类号 P157.8 [天文地球—天文学]
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参考文献17

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南京师大学报（自然科学版）
2005年 第4期

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