MOND PREDICTION FOR THE VELOCITY DISPERSION OF THE "FEEBLE GIANT" CRATER II

被引：42

作者：

McGaugh, Stacy S. ^{[1
]}

机构：

[1] Case Western Reserve Univ, Dept Astron, Cleveland, OH 44106 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2016年 / 832卷 / 01期

关键词：

dark matter; galaxies: dwarf; galaxies: kinematics and dynamics; MODIFIED NEWTONIAN DYNAMICS; LOW SURFACE BRIGHTNESS; DARK-MATTER HALOES; DWARF SPHEROIDALS; TOO-BIG; ANDROMEDA DWARFS; DENSITY PROFILE; ROTATION CURVES; LAMBDA-CDM; GALAXIES;

D O I：

10.3847/2041-8205/832/1/L8

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Crater II is an unusual object among the dwarf satellite galaxies of the Local Group in that it has a very large size for its small luminosity. This provides a strong test of MOND, as Crater II should be in the deep MOND regime (g(in) approximate to 34 km(2) s(-2) kpc(-1) << a(0) = 3700 km(2) s(-2) kpc(-1)). Despite its great distance (approximate to 120 kpc) from the Milky Way, the external field of the host (g(ex) approximate to 282 km(2) s(-2) kpc(-1)) comfortably exceeds the internal field. Consequently, Crater II should be subject to the external field effect, a feature unique to MOND. This leads to the prediction of a very low velocity dispersion: sigma(efe) 2.1(-0.6)(+0.9)km s(-1).

引用

页数：4

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