“NGC1052-DF2”的版本间差异

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*号称没有暗物质的星系, ultra diffuse galaxy [https://arxiv.org/abs/1803.10237] Nature
*号称没有暗物质的星系, ultra diffuse galaxy [https://arxiv.org/abs/1803.10237] '''Nature March 2018'''
:*an extraordinary population of globular clusters, larger and more luminous than average GCs in the Milky Way, total mass is roughly 4 percent of the mass in stars, making DF2 one of the galaxies with the largest specific frequencies known.
:*an extraordinary population of globular clusters, larger and more luminous than average GCs in the Milky Way, 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
:*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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* MOND
* MOND
:*不支持MOND，弱引力场（近似于有暗物质）[https://arxiv.org/abs/1804.04167]
:*不支持MOND，弱引力场（近似于有暗物质）[https://arxiv.org/abs/1804.04167]
:*你没考虑NGC1052作用，符合MOND！ [https://arxiv.org/abs/1903.11612], Nature
:*你没考虑NGC1052作用，符合MOND！ [https://arxiv.org/abs/1903.11612] '''Nature March 2019'''


* NGC1052-DF4， same group，第二个号称没有暗物质的星系 [https://arxiv.org/abs/901.05973]（还是球状星团算的速度弥散度）
* NGC1052-DF4， same group，第二个号称没有暗物质的星系 [https://arxiv.org/abs/901.05973]（还是球状星团算的速度弥散度）

2019年3月29日 (五) 04:07的版本

  • 号称没有暗物质的星系, ultra diffuse galaxy [1] Nature March 2018
  • an extraordinary population of globular clusters, larger and more luminous than average GCs in the Milky Way, 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]
  • 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]
  • 没有暗物质的dynamical friction没那么简单, core-stalling and GC-GC interactions效应, 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 [5]
  • MOND
  • 不支持MOND，弱引力场（近似于有暗物质）[6]
  • 你没考虑NGC1052作用，符合MOND！ [7] Nature March 2019
  • NGC1052-DF4， same group，第二个号称没有暗物质的星系 [8]（还是球状星团算的速度弥散度）
取自“http://202.127.29.3/~shen/wiki/index.php?title=NGC1052-DF2&oldid=3048”