A census of the expected properties of classical Milky Way dwarfs in Milgromian dynamics
A census of the expected properties of classical Milky Way dwarfs in Milgromian dynamics
复制标题
米尔格罗米亚动力学中经典银河系矮星预期特性的普查
DOI:
10.1093/mnras/stu757
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发表时间:
2014
影响因子:
4.8
通讯作者:
Kroupa
中科院分区:
文献类型:
--
作者:
Lüghausen;Famaey;Kroupa
Prompted by the recent successful predictions of the internal dynamics of Andromeda's satellite galaxies, we revisit the classical Milky Way dwarf spheroidal satellites Draco, Sculptor, Sextans, Carina and Fornax in the framework of Milgromian dynamics (MOND). We use for the first time a Poisson solver with adaptive mesh refinement (AMR) in order to account simultaneously for the gravitational influence of the Milky Way and its satellites. This allows us to rigorously model the important external field effect (EFE) of Milgromian dynamics, which can reduce the effective acceleration significantly. We make predictions on the dynamical mass-to-light ratio (Mdyn/L) expected to be measured by an observer who assumes Newtonian dynamics to be valid. We show that Milgromian dynamics predicts typicalMdyn/L≈ 10-50 M⊙/L⊙. The results for the most luminous ones, Fornax and Sculptor, agree well with available velocity dispersion data. Moreover, the central power-law slopes of the dynamical masses agree exceedingly well with values inferred observationally from velocity dispersion measurements. The results for Sextans, Carina and Draco are low compared to usually quoted observational estimates, as already pointed out by Angus. For Milgromian dynamics to survive further observational tests in these objects, one would thus need that either (a) previous observational findings based on velocity dispersion measurements have overestimated the dynamical mass due to, e.g. binaries and contaminant outliers, (b) the satellites are not in virial equilibrium due to the Milky Way tidal field, or (c) the specific theory used here does not describe the EFE correctly (e.g. the EFE could be practically negligible in some other theories), or a combination of (a)–(c).
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DOI:
10.1088/0004-637x/698/2/1630
发表时间:
2008
期刊:
The Astrophysical Journal
影响因子:
--
作者:
M. Milgrom
通讯作者:
M. Milgrom
影响因子:
5
作者:
HongSheng Zhao;B. Famaey
通讯作者:
B. Famaey
DOI:
--
发表时间:
2013
期刊:
影响因子:
--
作者:
F. Hammer;Yanbin Yang;S. Fouquet;M. Pawlowski;P. Kroupa;M. Puech;H. Flores;Jianling Wang Laboratoire Gepi;O. Paris;France National Astronomical Observatoires;Chinese Academy of Sciences;C. I. F. Astronomy;U. Bonn;Bonn;H Germany
通讯作者:
H Germany
DOI:
10.1140/epjc/s10052-012-1884-6
发表时间:
2011
期刊:
The European Physical Journal C
影响因子:
--
作者:
X. Hernández;M. A. Jiménez;C. Allen
通讯作者:
C. Allen
影响因子:
6.5
作者:
A. L. Serra;G. Angus;A. Diaferio
通讯作者:
A. Diaferio