“NGC1052-DF2”的版本间差异
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*号称没有暗物质的星系 |
*号称没有暗物质的星系, ultra diffuse galaxy [https://arxiv.org/abs/1803.10237] Nature |
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: an extraordinary population of globular clusters. They are both larger and more luminous than average GCs in the Milky Way, and their total mass is roughly 4 percent of the mass in stars, making DF2 one of the galaxies with the largest specific frequencies known. |
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: the line-of-sight velocity dispersion of the GCs suggests a total dynamical mass for DF2 that leaves little room for any dark matter |
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:气体含量非常低 arXiv:1810.04938 arXiv:1901.07586 |
:气体含量非常低 arXiv:1810.04938 arXiv:1901.07586 |
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* really? |
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*如果有暗物质,这些球状星团系统受到暗物质的dynamic friction,会形成nuclear cluster[arXiv:1902.05959 ] |
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:测量误差很大,不能说得那么肯定 [https://arxiv.org/abs/1804.04136] |
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:如果没有暗物质,星系和球状星团质量的比靠近,动力学摩擦效应显著,哪些星团已经并合了[https://arxiv.org/abs/1806.01812] ApJL |
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:考虑NGC1052的tidal效应,改变了DF2中球状星团在相空间的分布函数 (真实空间外围的GC少了,GC在速度空间的弥散小了) [https://arxiv.org/abs/1810.03864] Nussler A., MNRAS |
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:没有暗物质的dynamical friction没那么简单, core-stalling and GC-GC interactions , 让星团掉不进去。反过来,如果有cuspy的NFW暗晕,里面的dynamical friction更强,会形成核心GC[arXiv:1902.05959 ] |
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* MOND |
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: 不支持MOND,弱引力场(近似于有暗物质)[https://arxiv.org/abs/1804.04167] |
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: 你没考虑NGC1052作用,符合MOND! [[https://arxiv.org/abs/1903.11612 1903.11612]], Nature |
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* [[https://arxiv.org/abs/1903.11612 1903.11612]] Nature 文章:动力学符合MOND |
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2019年3月29日 (五) 03:38的版本
- 号称没有暗物质的星系, ultra diffuse galaxy [1] Nature
- an extraordinary population of globular clusters. They are both larger and more luminous than average GCs in the Milky Way, and their total mass is roughly 4 percent of the mass in stars, making DF2 one of the galaxies with the largest specific frequencies known.
- the line-of-sight velocity dispersion of the GCs suggests a total dynamical mass for DF2 that leaves little room for any dark matter
- 气体含量非常低 arXiv:1810.04938 arXiv:1901.07586
- really?
- 测量误差很大,不能说得那么肯定 [2]
- 如果没有暗物质,星系和球状星团质量的比靠近,动力学摩擦效应显著,哪些星团已经并合了[3] ApJL
- 考虑NGC1052的tidal效应,改变了DF2中球状星团在相空间的分布函数 (真实空间外围的GC少了,GC在速度空间的弥散小了) [4] Nussler A., MNRAS
- 没有暗物质的dynamical friction没那么简单, core-stalling and GC-GC interactions , 让星团掉不进去。反过来,如果有cuspy的NFW暗晕,里面的dynamical friction更强,会形成核心GC[arXiv:1902.05959 ]
- MOND
- 不支持MOND,弱引力场(近似于有暗物质)[5]
- 你没考虑NGC1052作用,符合MOND! [1903.11612], Nature
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- NGC1052-DF4, same group,第二个号称没有暗物质的星系 arXiv:1901.05973 (球状星团算的速度弥散度)