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arXiv 1901.02679astro-ph.GA
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群环境中超弥散星系目录的预测MOND速度色散

Predicted MOND velocity dispersions for a catalog of ultra-diffuse galaxies in group environments

Oliver Müller, Benoit Famaey, Hongsheng Zhao

摘要:

超弥散星系缺乏暗物质的可能性最近激发了人们的兴趣,以检查修改后的牛顿动力学(MOND)预测的有效性,这样的星系的规模。研究表明,由邻近星系引起的外场效应(EFE)可以抑制这些系统的速度色散,使它们在牛顿背景下几乎不含暗物质。在这里,接下来,我们对附近宇宙中22个超扩散星系的速度色散进行了先验预测。该样本可用于测试MOND和EFE,并进行后续测量。我们构建了一个目录附近的超扩散星系在星系群环境中,并设置上限和下限的可能的速度色散允许在MOND,考虑到可能的变化,在质量-光比的矮星和星系群的距离。速度色散的预测是作为一个功能的三维分离的矮星,它的主机。在22例中的17例中,EFE在预测中起着关键作用。

英文摘要:

The possibility that ultra-diffuse galaxies lacking dark matter has recently stimulated interest to check the validity of Modified Newton Dynamics (MOND) predictions on the scale of such galaxies. It has been shown that the External Field Effect (EFE) induced by the close-by galaxy can suppress the velocity dispersion of these systems, so that they appear almost dark matter free in the Newtonian context. Here, following up on this, we are making a priori predictions for the velocity dispersion of 22 ultra-diffuse galaxies in the nearby Universe. This sample can be used to test MOND and the EFE with future follow-up measurements. We construct a catalog of nearby ultra-diffuse galaxies in galaxy group environments, and set upper and lower limits for the possible velocity dispersion allowed in MOND, taking into account possible variations in the mass-to-light ratio of the dwarf and in the distance to the galaxy group. The prediction for the velocity dispersion is made as a function of the three dimensional separation of the dwarf to its host. In 17 out of 22 cases, the EFE plays a crucial role in the prediction.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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