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arXiv 0907.4758astro-ph.COastro-ph.GA
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寻找最不亮的星系

In Pursuit of the Least Luminous Galaxies

Beth Willman

摘要:

银河系的矮星系同伴是独特的宇宙学实验室。它们的光度低至10^-7 L_MW,存在于已知的最低质量的恒星宿主暗物质晕中,是目前最直接的暗物质分布、质谱和成团尺度的示踪物。它们分辨出的恒星星族也有助于详细研究它们的历史和质量含量。为了充分利用这一潜力,需要对几乎不可见的星系进行明确的普查,以达到最微弱的可能限制和最大的可能距离。我回顾了过去和现在的调查天文学对银河系矮星系同伴普查的影响,并讨论了未来在银河系周围及以外的宽视场调查数据中发现超微弱的矮星系。

英文摘要:

The dwarf galaxy companions to the Milky Way are unique cosmological laboratories. With luminosities as low as 10^-7 L_MW, they inhabit the lowest mass dark matter halos known to host stars and are presently the most direct tracers of the distribution, mass spectrum, and clustering scale of dark matter. Their resolved stellar populations also facilitate detailed studies of their history and mass content. To fully exploit this potential requires a well-defined census of virtually invisible galaxies to the faintest possible limits and to the largest possible distances. I review the past and present impacts of survey astronomy on the census of Milky Way dwarf galaxy companions, and discuss the future of finding ultra-faint dwarf galaxies around the Milky Way and beyond in wide-field survey data.

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