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arXiv 1304.3124astro-ph.CO
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全球环境对低红移星系质量函数的影响

The impact of global environment on galaxy mass functions at low redshift

Rosa Calvi, Bianca M. Poggianti, Benedetta Vulcani, Giovanni Fasano

摘要:

本文研究了局域宇宙中不同环境下的星系-恒星质量函数,同时考虑了总质量函数和单个星系形态类型的质量函数。我们比较了用$\rm log_{10} M_{\star}/M_{\odot} \geq 10.25$计算的帕多瓦千禧星系和星系团星表中星系团的质量函数与$z=0.04-0.07$的宽视场近星系团巡天中星系团的质量函数。引人注目的是,总体上,质量函数随全球环境的变化是微小而微妙的。一般场和团簇的质量函数的形状是不可区分的,并且在组中只允许很小的、统计上不显著的变化。只有我们的单个星系的质量函数,代表最小的质量晕,并包括不到三分之一的一般场人口,是按比例丰富的低质量星系比其他环境。最显著的环境效应是上层星系质量的逐渐变化,只有在最大质量的环境中才能发现非常大质量的星系。这种依赖于环境的质量截止不能影响Schechter参数和K-S检验,只能通过特别分析来揭示。最后,我们展示了如何在每个给定的环境中,质量函数的形态类型的变化,以及相同的形态类型的星系可以有不同的质量函数在不同的环境。

英文摘要:

We study the galaxy stellar mass function in different environments in the local Universe, considering both the total mass function and that of individual galaxy morphological types. We compare the mass functions of galaxies with $\rm log_{10} M_{\star}/M_{\odot} \geq 10.25$ in the general field and in galaxy groups, binary and single galaxy systems from the Padova-Millennium Galaxy and Group Catalogue at $z=0.04-0.1$ with the mass function of galaxy clusters of the WIde-field Nearby Galaxy-Cluster Survey at $z=0.04-0.07$. Strikingly, the variations of the mass function with global environment, overall, are small and subtle. The shapes of the mass functions of the general field and clusters are indistinguishable, and only small, statistically insignificant variations are allowed in groups. Only the mass function of our single galaxies, representing the least massive haloes and comprising less than a third of the general field population, is proportionally richer in low-mass galaxies than other environments. The most notable environmental effect is a progressive change in the upper galaxy mass, with very massive galaxies found only in the most massive environments. This environment-dependent mass cut-off is unable to affect the Schechter parameters and the K-S test, and can only be revealed by an ad-hoc analysis. Finally, we show how, in each given environment, the mass function changes with morphological type, and that galaxies of the same morphological type can have different mass functions in different environments.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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