Gas Rich Galaxies in a Wide Range of Environments

通过中性氢线的三维成像，在广泛的环境下研究了银河系的性质。主要讨论的主题是大尺度结构和星系演化。对精心挑选的具有不同星系密度的区域进行调查，寻找富含气体的系统。这就解决了富含气体的矮星系是否比发光星系分布更均匀的问题，这是一个长期没有答案的问题。此外，对九头蛇星系团进行了全面调查。这是第一次对一个星系团进行体积有限的HI调查。这些数据是对已有的关于星系团中星系的全局HI特性的单碟数据的补充。详细地研究了环境对星系演化的影响。工作中的气体去除机制的细节，已知会耗尽星系中的原子气体，研究人员特别关注由于星系间介质压缩气体而增强恒星形成的可能性。从气体的二维速度场中推导出星系的质量分布，并与场中星系的质量分布进行比较，从而确定暗物质是否与星系团中的星系以类似于场中的方式联系在一起。

Galactic properties are investigated in a wide range of environments by three dimensional imaging in the neutral hydrogen line. The main topics addressed are large scale structure and galaxy evolution. A survey of carefully selected areas with different galaxian densities is made, searching for gas rich systems. This settles the question as to whether gas rich dwarf galaxies are more uniformly distributed than luminous galaxies, a question long unanswered. In addition, a complete survey of the Hydra Cluster of galaxies is made. This is the first time that a volume limited HI survey of a cluster of galaxies has been carried out. These data are complementary to the wealth of already available single dish data on the global HI properties of galaxies in clusters. A detailed study is made of the effects of the environment on the evolution of galaxies. Details of the gas removal mechanisms at work, which are known to deplete the atomic gas in the galaxies, are studied with particular attention to the possibility that enhanced star formation occurs due to compression of the gas by the intergalactic medium. From the two-dimensional velocity fields of the gas the mass distribution of the galaxies is derived and compared with that of galaxies in the field, thus establishing whether dark matter is associated with galaxies in clusters in a similar way to those in the field.