Evidence for Light-weight Local Group Dwarf Spheroidal Galaxies

Details Evidence for Light-weight Local Group Dwarf Spheroidal Galaxies Evidence for Light-weight Local Group Dwarf Spheroidal Galaxies

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..220..365k&link_type=abstract

International Astronomical Union Symposium no. 220, held 21 - 25 July, 2003 in Sydney, Australia. Eds: S. D. Ryder, D. J. Pisano

Astronomy and Astrophysics

Astronomy

Scientific paper

Local Group dwarf spheroidal (dS) galaxies are a testing ground for dark matter dominated models of galaxy structure formation and dynamical evolution. Using Keck HIRES kinematic data CFHT deep wide-field photometry and a new analysis of a Mathieu equation description of parametric tidal interactions we demonstrate that these galaxies are unlikely to be in dynamical equilibrium. The data and models imply that dS dynamics and morphology are controlled by multiple perigalacticon orbit passes in mildly elliptical Milky Way orbits.

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