南GEMS星系群II：HI分布、质量函数和HI亏损星系
Southern GEMS groups II: HI distribution, mass functions and HI deficient galaxies
摘要：
我们调查的中性氢（HI）含量的16组，我们有多波长的数据，包括X射线观测。用64米帕克斯望远镜上的20厘米多波束系统获得了这些群体的宽视场成像。我们已经检测到10个以前未编目的HI源，其中一个没有可见的光学对应物。我们研究的HI属性的群体，相比他们的X射线特性，发现那些群体具有较高的X射线温度和光度包含较少的HI每个星系。一个星系团的HI含量取决于其形态组成，其中以早期型星系为主的星系团的HI含量最少。我们测定了星系群中旋涡星系的HI值，发现有一些星系缺乏HI。HI缺陷螺旋在有和没有热的组内培养基的组中均被发现。缺乏HI的星系并不一定位于星系群的中心，但是，我们确实发现三分之二的缺乏HI的星系位于距离星系群中心约1 Mpc的范围内，这表明星系群的环境正在影响这些星系的气体损失。我们确定了HI质量函数的复合样本的15组，并发现它是显着平坦的比现场HI质量函数。我们还发现，在群体中缺乏高HI质量星系。造成这种效应的一个可能原因是，当螺旋星系被分组进行预处理时，HI气体会被潮汐剥离。
英文摘要：
We investigate the neutral hydrogen (HI) content of sixteen groups for which we have multi-wavelength data including X-ray observations. Wide-field imaging of the groups was obtained with the 20-cm multibeam system on the 64-m Parkes telescope. We have detected ten previously uncatalogued HI sources, one of which has no visible optical counterpart. We examine the HI properties of the groups, compared to their X-ray characteristics, finding that those groups with a higher X-ray temperature and luminosity contain less HI per galaxy. The HI content of a group depends on its morphological make-up, with those groups dominated by early-type galaxies containing the least total HI. We determined the expected HI for the spiral galaxies in the groups, and found that a number of the galaxies were HI deficient. The HI deficient spirals were found both in groups with and without a hot intra-group medium. The HI deficient galaxies were not necessarily found at the centre of the groups, however, we did find that two thirds of HI deficient galaxies were found within about 1 Mpc from the group centre, indicating that the group environment is affecting the gas-loss from these galaxies. We determined the HI mass function for a composite sample of 15 groups, and found that it is significantly flatter than the field HI mass function. We also find a lack of high HI-mass galaxies in groups. One possible cause of this effect is the tidal stripping of HI gas from spiral galaxies as they are pre-processed in groups.
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