Implications for dwarf spheroidal mass content from interloper removal
Implications for dwarf spheroidal mass content from interloper removal
复制标题
干扰物去除对矮球体质量含量的影响
DOI：
10.1051/0004-6361/201015180
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发表时间：
2009
影响因子：
6.5
通讯作者：
A. Diaferio
中科院分区：
文献类型：
--
作者：
A. L. Serra;G. Angus;A. Diaferio
利用焦散方法，我们确定了银河系中五个矮球状星系（dSph）的成员恒星，这是宇宙中最小的暗物质（DM）主导系统。在排除干扰后，我们计算的视线速度色散曲线比以前的结果平滑得多。此外，两个dsph的视距速度色散比之前的计算结果小20%。我们的Jeans模型证实了300pc内部的DM含量与卫星亮度大致恒定。最后，如果我们假设MOND提供了真正的引力定律，我们对闯入者的识别意味着，四个dsph的质量与光比与恒星人口综合模型一致，而船底座的质量与光比仍然是MOND的一个大的两倍，这仍然是一个问题。
Using the caustic method, we identify the member stars of five dwarf spheroidal (dSph) galaxies of the Milky Way, the smallest dark matter (DM) dominated systems in the Universe. After our interloper rejection, we compute line-of-sight velocity dispersion profiles that are substantially smoother than previous results. Moreover, two dSphs have line-of-sight velocity dispersions 20% smaller than previous calculations suggested. Our Jeans modelling confirms that the DM content interior to 300 pc is roughly constant with satellite luminosity. Finally, if we assume that MOND provides the true law of gravity, our identification of interlopers implies that four dSphs have mass-to-light ratios in agreement with stellar population synthesis models, whereas Carina still has a mass-to-light ratio a factor of two too large and remains a problem for MOND.