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Extreme Dark Matter Dominated Dwarfs

Published online by Cambridge University Press:  26 May 2016

Mark I. Wilkinson ,
Jan T. Kleyna ,
N. Wyn Evans  and
Gerard F. Gilmore
Mark I. Wilkinson
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK
Jan T. Kleyna
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK
N. Wyn Evans
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK
Gerard F. Gilmore
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK

Abstract

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The results of a large radial velocity survey of the Draco and Ursa Minor dwarf spheroidal galaxies are presented. the velocity dispersion profiles of both objects are very similar: initially the dispersion increases with radius, while at radii approaching the outer limit of the stellar distribution we observe a sharp fall-off. We present the results of mass modeling based on these new data – the mass to light ratios are found to be about 400M⊙/L⊙. Evidence is also presented that the dark matter in the central regions of UMi has a core-like distribution. Finally, we demonstrate that the inner regions of UMi have not been affected by tides and discuss the implications of our data for MOdified Newtonian Dynamics (MOND).

Type
Part 11: Dwarf Galaxies
Information
Symposium - International Astronomical Union , Volume 220: Dark Matter in Galaxies , 2004 , pp. 359 - 364
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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