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Extreme Dark Matter Dominated Dwarfs
Published online by Cambridge University Press: 26 May 2016
Abstract
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