在A963中绘制环境影响工作图
Mapping the working of environmental effects in A963
摘要：
我们定性地评估和映射的相对贡献的预处理和集群相关的过程中建立的A963，一个巨大的集群在z=0.2，显示出异常高的分数在其内部的恒星形成星系。我们使用Voronoi binning的位置的集群成员的天空平面上，以映射的2D变化的星系属性的中心和下落区域的A963。我们利用全SED拟合、21 cm成像和光谱学方法绘制了四个星系参数（恒星形成星系比例、比恒星形成率、HI亏损和恒星星族年龄）。我们发现一个扩展的区域占主导地位的被动星系沿南北轴穿过集群中心，可能与已知的丝的大尺度结构。有迹象表明，这个区域的被动星系在到达星系团附近之前很久就已经熄灭了。与此相反，在星团中心的东部和西部，是由富含气体的、活跃的恒星形成星系主导的最近吸积区域，这些星系与任何子结构或暗条无关。在这个区域的少数被动星系似乎是最近淬火的，一些富含气体的星系显示出正在进行的冲压压力剥离的迹象。我们报告的第一次尝试性的观察，在21厘米的持续冲压压力剥离在z=0.2，以及观察到的低熵气体流入集群沿细丝的大尺度结构。观测到的A963的星系含量是不同性质星系强烈各向异性吸积的结果。富含气体的恒星形成星系正在从星团的东部和西部吸积，这些星系在r<R200时被淬灭，而大部分的吸积，包含多个群体，沿着南北轴发生，并带来了大部分被动星系。
英文摘要：
We qualitatively assess and map the relative contribution of pre-processing and cluster related processes to the build-up of A963, a massive cluster at z=0.2 showing an unusually high fraction of star forming galaxies in its interior. We use Voronoi binning of positions of cluster members on the plane of the sky in order to map the 2D variations of galaxy properties in the centre and infall region of A963. We map four galaxy parameters (fraction of star forming galaxies, specific star formation rate, HI deficiency and age of the stellar population) based on full SED fitting, 21cm imaging and optical spectroscopy. We find an extended region dominated by passive galaxies along a north-south axis crossing the cluster centre, possibly associated with known filaments of the large-scale structure. There are signs that the passive galaxies in this region were quenched long before their arrival in the vicinity of the cluster. Contrary to that, to the east and west of the cluster centre lie regions of recent accretion dominated by gas rich, actively star forming galaxies not associated with any substructure or filament. The few passive galaxies in this region appear to be recently quenched, and some gas rich galaxies show signs of ongoing ram-pressure stripping. We report the first tentative observations at 21cm of ongoing ram-pressure stripping at z=0.2, as well as observed inflow of low-entropy gas into the cluster along filaments of the large-scale structure. The observed galaxy content of A963 is a result of strongly anisotropic accretion of galaxies with different properties. Gas rich, star forming galaxies are being accreted from the east and west of the cluster and these galaxies are being quenched at r<R200, while the bulk of the accretion, containing multiple groups, happens along the north-south axis and brings mostly passive galaxies.
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