通过NGC 1052中心附近折射到超漫射星系NGC 1052- DF2中
Refracting into Ultra Diffuse Galaxy NGC 1052-DF2 by Passing near the Center of NGC 1052
摘要：
最近对超漫射星系NGC 1052-DF 2的观测表明，星系可能缺乏暗物质。在星系环境中，通常暗物质比恒星物质丰富得多。这种暗物质与重子的质量比通常大于宇宙学的大约5的质量比，因为重子的很大一部分以星系际介质的形式扩散。如何实现如此低的暗物质与重子质量比是对标准星系形成机制的挑战。在这里，我们表明，如果NGC 1052-DF 2在几千秒内经历了一次到星系NGC 1052中心的单次通过，那么这样低的比率可能是一个自然的结果。NGC 1052的潮汐效应将加热NGC 1052-DF 2，将以前的矮星系显著拉伸到目前的大小。观测区域中相对缺乏暗物质是暗物质扩展分布和相遇前相应中心区域相对较少浓度的自然结果，以及相遇后松弛期间痕量质量估计方法的系统低估。超漫射星系的平面分布可以再现。我们的结果表明，不需要引入任何新的物理机制。
英文摘要：
The recent observation of the ultra-diffuse galaxy NGC 1052-DF2 shows a galaxy may lack dark matter. Usually dark matter is much more abundant than stellar in galaxy environment. This dark matter to baryon mass ratio is generally larger than the cosmological ratio of about five, since a significant part of baryon is diffused in the form of intergalactic medium. How to achieve such a low dark matter to baryon mass ratio is a challenge to the standard galaxy formation mechanism. Here we show that such a low ratio can be a natural consequence if the NGC 1052-DF2 had experienced a single passage within a few kpcs to the center of galaxy NGC 1052. The tidal effect of NGC 1052 in the encounter will heat the NGC 1052-DF2 up, stretch the previous dwarf galaxy significantly into its current size. The relative lacking of dark matter in the observed region is a natural consequence of the dark matter extended distribution and relatively less concentration in the corresponding central region before encounter, together with a systematic underestimation of the trace mass estimator method during relaxation after encounter. The observed flat distribution of the ultra-diffuse galaxy can be reproduced. Our results shows no need of introducing any new physical mechanism.
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