Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.5701p&link_type=abstract
American Astronomical Society, 183rd AAS Meeting, #57.01D; Bulletin of the American Astronomical Society, Vol. 25, p.1383
Astronomy and Astrophysics
Astronomy
Scientific paper
Dwarf spheroidal galaxies (dSph's; hereafter), companions of the Milky Way, have unusually high apparent mass-to-light ratios, (M/L's; hereafter). For example, the two closest dSph's, Draco and Ursa Minor, have M/L's ~ 100. Such large apparent M/L's may indicate that dSph's contain a great deal of dark matter or that they are not in a virial equilibrium, e.g., due to galactic tides. In this work we investigate whether galactic tides can elevate the apparent M/L's in dwarf spheroidals. We find that tides can affect the structure, the kinematics, and the apparent M/L in a dSph, however, only under very special circumstances: the dSph must have an intrinsic M/L of about 1.0, it must be very near its perigalacticon, and it must be just disintegrating; it is unlikely that four out of eight dSph's should exist in these special circumstances. However, the ultimate test of the importance of tides in dSph's will come from searches for the kinematic signatures of tides in these galaxies. Tides produce large ordered motions rather than large random motions. A clear signature of these motions is apparent rotation.
Piatek Slawomir
Pryor Craig
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