MHONGOOSE巡天综述：用MeerKAT观测附近的Galerkin
An Overview of the MHONGOOSE Survey: Observing Nearby Galaxies with MeerKAT
摘要：
MHONGOOSE是对30个具有代表性的邻近盘星系和矮星系中中性氢分布的深度观测，这些星系的HI质量从10 ^6到10^{11} M_sun，亮度从M_R ~ -12到M_R ~-22。选择样本以均匀覆盖log（M_HI）中的可用范围。我们的极深观测，低至远低于10^{18} cm^{-2}的HI柱密度极限--或比星系中典型的HI盘暗几百倍--将直接探测来自星系际介质的冷吸积效应以及与宇宙网的联系。这些观测将是有史以来第一次以如此高的分辨率探测星系中极低柱密度的中性气体。与其他波长的数据相结合，其中大部分已经可用，将能够准确模拟这些星系中质量成分的性质和演变，并将这些与环境的影响，暗物质分布以及其他基本性质，如晕质量和角动量联系起来。MHONGOOSE已经可以开始解决SKA-1的一些科学目标，并将以高分辨率和超过5个数量级的列密度提供驱动附近宇宙中星系转变和演化的过程的全面清单。这将是一个在SKA出现之前无与伦比的Nearby Galvey Legacy Survey，可以作为MeerKAT能力的高度可见，持久的声明。
英文摘要：
MHONGOOSE is a deep survey of the neutral hydrogen distribution in a representative sample of 30 nearby disk and dwarf galaxies with HI masses from 10^6 to ~10^{11} M_sun, and luminosities from M_R ~ -12 to M_R ~ -22. The sample is selected to uniformly cover the available range in log(M_HI). Our extremely deep observations, down to HI column density limits of well below 10^{18} cm^{-2} - or a few hundred times fainter than the typical HI disks in galaxies - will directly detect the effects of cold accretion from the intergalactic medium and the links with the cosmic web. These observations will be the first ever to probe the very low-column density neutral gas in galaxies at these high resolutions. Combination with data at other wavelengths, most of it already available, will enable accurate modelling of the properties and evolution of the mass components in these galaxies and link these with the effects of environment, dark matter distribution, and other fundamental properties such as halo mass and angular momentum. MHONGOOSE can already start addressing some of the SKA-1 science goals and will provide a comprehensive inventory of the processes driving the transformation and evolution of galaxies in the nearby universe at high resolution and over 5 orders of magnitude in column density. It will be a Nearby Galaxies Legacy Survey that will be unsurpassed until the advent of the SKA, and can serve as a highly visible, lasting statement of MeerKAT's capabilities.
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