arXiv 1810.030892018-10astro-ph.GAgr-qchep-ph

星系群中的MOND

MOND in galaxy groups

Mordehai Milgrom

备注：: 5 text pages and 3 Tables. Added Figures and references, and expanded discussion. Version accepted for publication in Phys. Rev. D
发表信息：: Phys. Rev. D 98, 104036 (2018)
DOI：: 10.1103/PhysRevD.98.104036

摘要：

在MOND中几乎没有观察到的星系群，可以探测系统参数空间区域中的加速度差异，这些区域在研究充分的星系系统中是不可访问的，例如星系，星系团和矮球状卫星星系。星系群的大小通常与星系团的核心相当，但质量通常只有单个星系的几倍。星系群的加速度远低于星系群的加速度，也远低于MOND加速度。如此之多，以至于许多组可能会受到外部场效应的影响，这是MOND独有的，由于背景加速度。在这里，我分析了53个星系群的MOND动力学，最近在3个列表中编目。它们的牛顿、K波段、动力学$M/L$比为几十到几百个太阳单位，其中$\langle{M_d/L_K}\rangle= (56, 25, 30)~M_{\odot}/L_{\odot}$分别用于3个列表;因此显示出非常大的加速度差异。我发现在这里，MOND需要动态$M_M/L_K$值的顺序$1~M_{\odot}/L_{\odot}$，与$\langle{M_M/L_K}\rangle=(0.8, 0.56, 1.0) ~M_{\odot}/L_{\odot}$，为3个列表，这是在很好的协议与人口合成恒星的价值观，并与那些发现在个别星系。因此，MOND解释了在那些只有重子的群体中观察到的动力学，而不需要暗物质--这是MOND分析从星系到星系系统的重要扩展，其中，启动，具有几百千秒差距的特征大小，加速度比以前探测的要低得多--只有MOND的$a_0$的百分之几。因此，这些群体所表现出的加速度差异符合深MOND预言：$g\approx (g_Na_0)^{1/2}$，直到这些非常低的加速度（$g$是测量的，$g_N$是重子牛顿加速度）。

英文摘要：

Galaxy groups, which have hardly been looked at in MOND, afford probing the acceleration discrepancies in regions of system-parameter space that are not accessible in well-studied galactic systems, such as galaxies, galaxy clusters, and dwarf-spheroidal satellites of galaxies. Groups are typically the size of galaxy-cluster cores, but have masses typically only a few times that of a single galaxy. Accelerations in groups get far below those in galaxies, and far below the MOND acceleration. So much so, that many groups might be affected by the external-field effect, which is unique to MOND, due to background accelerations. Here, I analyze the MOND dynamics of 53 galaxy groups, recently catalogued in 3 lists. Their Newtonian, K-band, dynamical $M/L$ ratios are a few tens to several hundreds solar units, with $\langle{M_d/L_K}\rangle= (56, 25, 30)~M_{\odot}/L_{\odot}$, respectively for the 3 lists; thus evincing very large acceleration discrepancies. I find here that MOND requires dynamical $M_M/L_K$ values of order $1~M_{\odot}/L_{\odot}$, with $\langle{M_M/L_K}\rangle=(0.8, 0.56, 1.0) ~M_{\odot}/L_{\odot}$, for the 3 lists, which are in good agreement with population-synthesis stellar values, and with those found in individual galaxies. MOND thus accounts for the observed dynamics in those groups with baryons alone, and no need for dark matter -- an important extension of MOND analysis from galaxies to galactic systems, which, to boot, have characteristic sizes of several hundred kiloparsecs, and accelerations much lower than probed before -- only a few percent of MOND's $a_0$. The acceleration discrepancies evinced by these groups thus conform to the deep-MOND prediction: $g\approx (g_Na_0)^{1/2}$, down to these very low accelerations ($g$ is the measured, and $g_N$ the baryonic, Newtonian acceleration).

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。

摘要：

英文摘要：

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