Dwarf spheroidal galaxies and non-Newtonian gravity

Details Dwarf spheroidal galaxies and non-Newtonian gravity Dwarf spheroidal galaxies and non-Newtonian gravity

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...397...38g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 397, no. 1, p. 38-43.

Astronomy and Astrophysics

Astrophysics

35

Dark Matter, Dwarf Galaxies, Elliptical Galaxies, Galactic Clusters, Mass To Light Ratios, Galactic Evolution, Gravitation Theory, Kinematics, Metallicity

Scientific paper

We derive a virial theorem and an analog for King's formula in modified Newtonian dynamics (MOND) and use these to estimate the mass-to-light ratios (M/Ls) in MOND of the dwarf spheroidal galaxies in the Local Group. We find that the low-velocity dispersion observed in the Fornax dwarf galaxy implies low values for its M/L in MOND:0.3-1. In particular the derived value in the core of Fornax (0.3) is much lower than expected for a normal old stellar population. Conversely, the velocity-dispersion measurements in Draco and Ursa Minor appear to still require dark matter in MOND. We show that M/L must vary between the dwarf spheroidals around the Galaxy by a factor of order at least 20, even in MOND.

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