z=0.2时星系团的WSRT超深中性氢成像：Abell 963和Abell 2192的初步观测
WSRT Ultra-Deep Neutral Hydrogen Imaging of Galaxy Clusters at z=0.2, a Pilot Survey of Abell 963 and Abell 2192
摘要：
利用韦斯特博克合成射电望远镜（WSRT）强大的新后端对z=0.2的两个星系团进行的一项试点研究揭示了来自42个星系的中性氢发射。WSRT探测的总体积为3.4x10^4 Mpc ^3，分辨率为54 x86 kpc ^2和19.7 km/s，测量了两个星系团和它们所嵌入的大尺度结构。在Abell 963中，一个动态弛豫的、透镜化的Butcher-Oemler星系团，具有高的蓝色部分，大多数富含气体的星系位于1到3 Mpc的投影中，位于星系团核心的东北方向。它们的速度相对于星团有轻微的红移，这可能是一个背景群。阿贝尔963核心的蓝色星系都没有被HI探测到，尽管它们的颜色和光度与HI探测到的星系团外围和视野中的星系相似。Abell 2192的质量较小，而且更加分散。在这里，富含气体的星系分布得更均匀。检测到的HI质量范围为5x10^9至4x10^10 Msun。一些星系的空间分辨，提供了基本的旋转曲线有用的详细的运动学研究星系在各种环境中。这是一个超深积分的试点，质量低至8x10^8 Msun的HI，提供了z=0.2的星系气体含量的完整调查，探测从星系团核心到空洞的环境。
英文摘要：
A pilot study with the powerful new backend of the Westerbork Synthesis Radio Telescope (WSRT) of two galaxy clusters at z=0.2 has revealed neutral hydrogen emission from 42 galaxies. The WSRT probes a total combined volume of 3.4x10^4 Mpc^3 at resolutions of 54x86 kpc^2 and 19.7 km/s, surveying both clusters and the large scale structure in which they are embedded. In Abell 963, a dynamically relaxed, lensing Butcher-Oemler cluster with a high blue fraction, most of the gas-rich galaxies are located between 1 and 3 Mpc in projection, northeast from the cluster core. Their velocities are slightly redshifted with respect to the cluster, and this is likely a background group. None of the blue galaxies in the core of Abell 963 are detected in HI, although they have similar colors and luminosities as the HI detected galaxies in the cluster outskirts and field. Abell 2192 is less massive and more diffuse. Here, the gas-rich galaxies are more uniformly distributed. The detected HI masses range from 5x10^9 to 4x10^10 Msun. Some galaxies are spatially resolved, providing rudimentary rotation curves useful for detailed kinematic studies of galaxies in various environments. This is a pilot for ultra-deep integrations down to HI masses of 8x10^8 Msun, providing a complete survey of the gas content of galaxies at z=0.2, probing environments ranging from cluster cores to voids.
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