麦哲伦星云有多常见？
How Common are the Magellanic Clouds?
摘要：
我们介绍了一个概率的方法来计算数据库中的有限的红移信息的宿主星系周围的矮卫星的问题。这种技术被用来调查在斯隆数字巡天的天体目录中与银河系性质类似的宿主周围的光度类似于麦哲伦云的卫星的出现。我们的分析使用来自SDSS数据发布7的数据，从光谱目录中选择候选的Milky-Way-like主机，并从光度目录中选择麦哲伦云的候选类似物。我们的主要结果是一个银河状星系的主机N_{sat}密切的卫星光度类似于麦哲伦云的概率。我们发现，像银河系这样的星系中，有81%在半径150千秒差距内没有这样的卫星，11%有一个，只有3.5%的宿主有两个。的概率是强大的主机和卫星的选择标准，背景估计技术，和调查深度的变化。这些结果表明，银河系的卫星比其光度的典型星系要多得多;这一事实有助于理解我们所在星系的更大宇宙学背景。
英文摘要：
We introduce a probabilistic approach to the problem of counting dwarf satellites around host galaxies in databases with limited redshift information. This technique is used to investigate the occurrence of satellites with luminosities similar to the Magellanic Clouds around hosts with properties similar to the Milky Way in the object catalog of the Sloan Digital Sky Survey. Our analysis uses data from SDSS Data Release 7, selecting candidate Milky-Way-like hosts from the spectroscopic catalog and candidate analogs of the Magellanic Clouds from the photometric catalog. Our principal result is the probability for a Milky-Way-like galaxy to host N_{sat} close satellites with luminosities similar to the Magellanic Clouds. We find that 81 percent of galaxies like the Milky Way are have no such satellites within a radius of 150 kpc, 11 percent have one, and only 3.5 percent of hosts have two. The probabilities are robust to changes in host and satellite selection criteria, background-estimation technique, and survey depth. These results demonstrate that the Milky Way has significantly more satellites than a typical galaxy of its luminosity; this fact is useful for understanding the larger cosmological context of our home galaxy.
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