The normalization and slope of the dark matter (sub-)halo mass function on sub-galactic scales
The normalization and slope of the dark matter (sub-)halo mass function on sub-galactic scales
复制标题
亚星系尺度上暗物质（亚）晕质量函数的归一化和斜率
DOI：
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发表时间：
2019
影响因子：
4.8
通讯作者：
A. Benson
中科院分区：
文献类型：
--
作者：
A. Benson
冷暗物质的模拟在小尺度上对暗物质晕和亚晕质量函数的斜率和归一化作出了可靠的预测。最近利用强引力透镜的观测进展已经证明了这种技术能够在亚星系尺度上限制这些数量，对应于暗物质晕的质量为106 - $10^9\,\mathrm{M}_\odot$。在这些尺度上，重子的物理特性预计会影响结构的增长和暗物质晕的坍缩。重子占宇宙物质含量的17%左右，但不包括在纯暗物质n体模拟中。在这项工作中，我们开发了一个半解析模型来预测暗物质晕和亚晕质量函数在亚星系尺度上重子存在时的振幅和斜率。我们发现光晕质量函数被抑制了25%，并且斜率被修正，在这个质量范围内从- 1.916到- 1.868。这些结果与目前的测量结果是一致的，但与对只有暗物质的宇宙的期望有很大的不同，因此在不久的将来它可能是可测试的。
Simulations of cold dark matter make robust predictions about the slope and normalization of the dark matter halo and subhalo mass functions on small scales. Recent observational advances utilizing strong gravitational lensing have demonstrated the ability of this technique to place constraints on these quantities on subgalactic scales corresponding to dark matter halo masses of 106–$10^9\, \mathrm{M}_\odot$. On these scales the physics of baryons, which make up around 17 per cent of the matter content of the Universe but which are not included in pure dark matter N-body simulations, are expected to affect the growth of structure and the collapse of dark matter haloes. In this work, we develop a semi-analytic model to predict the amplitude and slope of the dark matter halo and subhalo mass functions on subgalactic scales in the presence of baryons. We find that the halo mass function is suppressed by up to 25 per cent, and the slope is modified, ranging from −1.916 to −1.868 in this mass range. These results are consistent with current measurements, but differ sufficiently from the expectations for a dark matter only universe that it may be testable in the near future.
影响因子：
4.8
作者：
J. Hsueh;Wolfgang Enzi;S. Vegetti;M. Auger;C. Fassnacht;G. Despali;L. Koopmans;J. McKean
通讯作者：
J. Hsueh;Wolfgang Enzi;S. Vegetti;M. Auger;C. Fassnacht;G. Despali;L. Koopmans;J. McKean
影响因子：
4.8
作者：
Ethan D Jahn;Laura V. Sales;A. Wetzel;M. Boylan-Kolchin;T K Chan;K. El-Badry;Alexandres Lazar;James S Bullock
通讯作者：
Ethan D Jahn;Laura V. Sales;A. Wetzel;M. Boylan-Kolchin;T K Chan;K. El-Badry;Alexandres Lazar;James S Bullock
影响因子：
8.7
作者：
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者：
Wright, E. L.