New Constraints on Red-Spiral Galaxies from Their Kinematics in Clusters of Galaxies
New Constraints on Red-Spiral Galaxies from Their Kinematics in Clusters of Galaxies
复制标题
星系团中红螺旋星系运动学的新约束
DOI：
10.1093/mnras/stz1991
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发表时间：
2019
影响因子：
4.8
通讯作者：
and Masahiro Nagashima
中科院分区：
文献类型：
--
作者：
Akinari Hamabata;Taira Oogi;Masamune Oguri;Takahiro Nishimichi;and Masahiro Nagashima
星系和它们的宿主星系团之间的成对视线速度的分布是根据星系的颜色和形态分离的。我们调查的速度分布的红旋涡星系，这是一个罕见的人口星系团内。我们发现，概率分布函数的成对线的视线velocityvlos之间的红旋涡星系和星系团有一个倾角atvlos= 0，这是一个非常奇怪的功能，在93%的置信水平。为了理解它的起源，我们构建了一个模型的相空间分布的星系团周围的星系在三维空间中使用cosmologicalN-body模拟。我们采用了一个两个组件模型，由落入组件，这对应于星系，现在落入星系团，和飞溅组件，这对应于星系的第一个（或更多）轨道后落入星系团。我们发现，我们可以重现的视线速度的红螺旋星系的分布与下降一个非常简单的假设，即红螺旋星系主要居住在下降组件，无论其空间分布的函数形式的选择。我们的结果限制了红旋涡星系的猝灭时间尺度为几个Gyr，以及形态变换有效的半径为。
The distributions of the pairwise line-of-sight velocity between galaxies and their host clusters are segregated according to the galaxy’s colour and morphology. We investigate the velocity distribution of red-spiral galaxies, which represents a rare population within galaxy clusters. We find that the probability distribution function of the pairwise line-of-sight velocityvlosbetween red-spiral galaxies and galaxy clusters has a dip atvlos= 0, which is a very odd feature, at 93 per cent confidence level. To understand its origin, we construct a model of the phase-space distribution of galaxies surrounding galaxy clusters in three-dimensional space by using cosmologicalN-body simulations. We adopt a two component model that consists of the infall component, which corresponds to galaxies that are now falling into galaxy clusters, and the splashback component, which corresponds to galaxies that are on their first (or more) orbit after falling into galaxy clusters. We find that we can reproduce the distribution of the line-of-sight velocity of red-spiral galaxies with the dip with a very simple assumption that red-spiral galaxies reside predominantly in the infall component, regardless of the choice of the functional form of their spatial distribution. Our results constrain the quenching time-scale of red-spiral galaxies to a few Gyr, and the radius where the morphological transformation is effective as.