The distribution of galaxy morphological types and the morphology–mass relation in different environments at low redshift
The distribution of galaxy morphological types and the morphology–mass relation in different environments at low redshift
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DOI：
10.1111/j.1745-3933.2011.01168.x
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发表时间：
2011-10
影响因子：
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通讯作者：
R. Calvi;B. Poggianti;G. Fasano;B. Vulcani
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文献类型：
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作者：
R. Calvi;B. Poggianti;G. Fasano;B. Vulcani
我们使用PM2 GC（Calvi，Poggianti & Vulcani 2011 a）中属于不同环境的2000个星系来展示不同星系形态类型的分数如何随全球环境而变化，以及在低红移下星系恒星质量的函数。考虑log 10 M ★/M <$≥ 10.25的质量有限星系样本，我们发现Es-S 0 s/晚型星系的比例从单星系到双星再到星系群的变化是平稳的。考虑到所有的环境，分数变化是更明显的S 0 s和晚型比椭圆形，仅仅由于一个急剧增强/缺乏S 0 s/晚型的集群相比，其他环境。质量范围为10.25 <log 10 M ★/M <$< 11的星系的形态分布与星系恒星质量和全球环境无关，但在星系团中除外。质量大于log 10 M ★/M⊙= 11的星系的形态是星系质量和全球环境的函数。因此，星系的形态-质量关系随着全球环境的变化而变化，这表明星系的恒星质量不是驱动星系形态分布的唯一参数。星系团中S 0和晚型星系的形态-质量关系与其他环境相比是特殊的，这强烈表明星系团特有的效应作用于这两种类型的星系，并且星系团中相当数量的S 0与其他环境中的S 0具有不同的起源。
We use ∼2000 galaxies from PM2GC (Calvi, Poggianti & Vulcani 2011a) belonging to different environments to show how the fractions of different galaxy morphological types vary with global environment and as function of galaxy stellar mass at low redshift. Considering mass-limited galaxy samples with log10M★/M⊙≥ 10.25, we find a smooth increase/decline in the fraction of Es–S0s/late-type galaxies going from single galaxies, to binaries, to groups. Considering all environments, the fractional variation is more conspicuous for S0s and late types than for ellipticals solely due to a sharp enhancement/dearth of S0s/late types in clusters compared to other environments. The morphological distribution of galaxies in the mass range 10.25 < log10M★/M⊙ < 11 is rather independent of both galaxy stellar mass and global environment, except in clusters. The morphologies of galaxies more massive than log10M★/M⊙= 11 are instead a function of both galaxy mass and global environment. The morphology–mass relation therefore changes with global environment, showing that galaxy stellar mass cannot be the only parameter driving the morphological distribution of galaxies. The morphology–mass relations for S0 and late-type galaxies in clusters are peculiar compared to other environments, and this strongly suggests that cluster-specific effects act on these two types of galaxies, and that a significant number of S0s in clusters has a different origin with respect to S0s in other environments.