Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2011-02-01
2011, MNRAS, 413, 2873
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
4 pages, 3 figures. Accepted for publication in MNRAS. The definitive version will be available at http://www.blackwell-synerg
Scientific paper
10.1111/j.1365-2966.2011.18365.x
The MOdified Newtonian Dynamics (MOND) is an alternative to the dark matter assumption that can explain the observed flat rotation curve of galaxies. Here hydrodynamic accretion is considered to critically check the consistency and to constrain the physical interpretation of this theory. It is found that, in case of spherically symmetrical hydrodynamic accretion, the modified Euler's equation has real solution if the interpretation is assumed to be a modification of the law of dynamics. There is no real solution if it is assumed to be an acceleration scale dependent modification of the gravitational law. With the modified Euler's equation, the steady state mass accretion rate is found to change up to ~ 15%. The astrophysical and cosmological implications of these results are also discussed.
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