Gas Rich Galaxies in a Wide Range of Environments

银河系的性质是在广泛的研究 通过在中性氢中的三维成像， 线 讨论的主要议题是大规模结构和 星系演化 对精心挑选的地区进行调查， 不同的银河系密度，寻找富含天然气的 系统. 这就解决了富气矮星 星系比发光星系分布更均匀， 这个问题一直没有答案 此外，一个完整的调查 九头蛇星系团形成。 这是第一次， 对一个星系团进行了体积有限的HI巡天 出去 这些数据是对已经丰富的 关于星系整体HI特性的可用单碟数据 成簇的。 本文详细研究了在不同温度下， 环境对星系演化的影响 气体的细节 清除机制在工作，这是众所周知的消耗原子 气体在星系中，研究特别注意的是， 由于压缩而增强星星形成的可能性 星系间介质的气体。 从二维 气体的速度场星系的质量分布 并与该领域的星系进行了比较，从而 确定暗物质是否与星系有关， 以类似于现场的方式进行集群。

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.