Journal
ASTROPHYSICAL JOURNAL
Volume 611, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1086/423619
Keywords
dark matter-galaxies; individual (Draco dwarf spheroidal; Ursa Minor dwarf spheroidal)-galaxies; kinematics and dynamics-Local Group-stellar dynamics
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Funding
- Particle Physics and Astronomy Research Council
- Beatrice Watson Parrent Fellowship
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We present projected velocity dispersion profiles for the Draco and Ursa Minor (UMi) dwarf spheroidal galaxies based on 207 and 162 discrete stellar velocities, respectively. Both profiles show a sharp decline in the velocity dispersion outside similar to 30' (Draco) and similar to 40' ( UMi). New deep photometry of Draco reveals a break in the light profile at similar to 25'. These data imply the existence of a kinematically cold population in the outer parts of both galaxies. Possible explanations of both the photometric and the kinematic data in terms of both equilibrium and nonequilibrium models are discussed in detail. We conclude that these data challenge the picture of dwarf spheroidal galaxies as simple, isolated stellar systems.
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