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北美退伍军人节(Veterans Day),12 日无更新
arXiv 1409.4416astro-ph.GAastro-ph.CO
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团簇性质影响猝灭速率吗?

Do cluster properties affect the quenching rate?

A. Raichoor, S. Andreon

摘要:

淬灭率是已知的,取决于星系恒星的质量和环境,然而,可能的托管晕属性,如质量,丰富度和动力学状态的依赖关系,仍然有争议。这些依赖关系的确定受到系统学的阻碍,这是由于对星系团质量的嘈杂估计或对星系恒星质量缺乏控制而引起的,这可能会掩盖现有的趋势或引入假趋势。我们研究了一个局部星系团的样本(20个,0.02<z<0.1,log(M200/Msun)>14),这些样本是独立于所研究的星系性质而选择的,具有均匀的光学光度学和X射线估计性质。使用这些最高质量的测量集群质量,因此集群规模,丰富度,铁丰度,冷却时间/存在的一个冷核心,我们研究淬火对这些集群属性的同时依赖于星系恒星质量M和归一化的集群中心距离r/r200。我们发现,淬火率可以完全描述只有两个变量,星系恒星质量和归一化的集群中心距离,是独立的晕属性(质量,丰富度,铁丰度,存在一个冷的核心,和中央冷却时间)。在大多数情况下,这些晕属性的变化小于3%的概率,星系被淬火,一旦质量大小(M200-r200)的比例关系是通过集群中心的距离归一化占。

英文摘要:

The quenching rate is known to depend on galaxy stellar mass and environment, however, possible dependences on the hosting halo properties, such as mass, richness, and dynamical status, are still debated. The determination of these dependences is hampered by systematics, induced by noisy estimates of cluster mass or by the lack of control on galaxy stellar mass, which may mask existing trends or introduce fake trends. We studied a sample of local clusters (20 with 0.02<z<0.1 and log(M200/Msun)>14), selected independent of the galaxy properties under study, having homogeneous optical photometry and X-ray estimated properties. Using those top quality measurements of cluster mass, hence of cluster scale, richness, iron abundance, and cooling time/presence of a cool-core, we study the simultaneous dependence of quenching on these cluster properties on galaxy stellar mass M and normalised cluster-centric distance r/r200. We found that the quenching rate can be completely described by two variables only, galaxy stellar mass and normalised cluster-centric distance, and is independent of halo properties (mass, richness, iron abundance, presence of a cool-core, and central cooling time). These halo properties change, in most cases, by less than 3% the probability that a galaxy is quenched, once the mass-size (M200-r200) scaling relation is accounted for through cluster-centric distance normalisation.

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