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arXiv 1101.3244astro-ph.CO
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低红移星系性质对环境的依赖

The dependence of low redshift galaxy properties on environment

Simone M. Weinmann, Frank C. van den Bosch, Anna Pasquali

摘要:

本文综述了近年来有关星系在低红移时各种性质对环境依赖性的研究结果。作为环境指标,我们使用组质量,组中心半径,以及中心和卫星之间的区别;检查星系属性包括恒星形成率,颜色,活动星系核分数,年龄,金属丰度和浓度。一般来说,如果卫星星系位于更大质量的晕中,它们与中央星系的偏离会更明显。我们表明,这些结果是一致的饥饿是主要的环境影响,如果考虑到卫星,居住在更大的晕和较小的晕中心半径平均已吸积了更长的时间前。然而,对环境的影响还没有完全了解。特别令人困惑的是,环境对星系的影响似乎与其恒星质量无关。这可能表明,剥离扩展的卫星星系的气体水库主要发生通过潮汐力,而不是冲压压力。

英文摘要:

We review recent results on the dependence of various galaxy properties on environment at low redshift. As environmental indicators, we use group mass, group-centric radius, and the distinction between centrals and satellites; examined galaxy properties include star formation rate, colour, AGN fraction, age, metallicity and concentration. In general, satellite galaxies diverge more markedly from their central counterparts if they reside in more massive haloes. We show that these results are consistent with starvation being the main environmental effect, if one takes into account that satellites that reside in more massive haloes and at smaller halo-centric radii on average have been accreted a longer time ago. Nevertheless, environmental effects are not fully understood yet. In particular, it is puzzling that the impact of environment on a galaxy seems independent of its stellar mass. This may indicate that the stripping of the extended gas reservoir of satellite galaxies predominantly occurs via tidal forces rather than ram-pressure.

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