Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....109.1071p&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 109, no. 3, p.1071-1085
Astronomy and Astrophysics
Astronomy
115
Dwarf Galaxies, Galactic Rotation, Gravitation, Kinematics, Mass To Light Ratios, Milky Way Galaxy, Orbits, Tides, Apsides, Computer Programs, Computerized Simulation, Flux Density, Gravitational Fields, Velocity Distribution
Scientific paper
We have performed numerical simulations to investigate whether galactic tides can elevate the apparent mass-to-light ratio (M/L) in a dwarf spheroidal galaxy (dSph). In our simulations the dSph is composed only of luminous matter and falls towards the Milky Way on various orbits and in various galactic potentials starting from apogalacticon. We assume a single perigalacticon passage in which the close encounter with the Milky Way produces strong tides that greatly affect the structure and the kinematics of the dSph. We find that even when tides affect the structure and the kinematics of the dSph, they fail to inflate the central M/L. Tides produce large ordered motions rather than large random motions; a clear signature of these motions is apparent rotation. Tides can inflate the global M/L to a value as large as approximately 40; however, this is solely due to the ordered motions. comparing our results with real dSphs, we conclude that galactic tides at the most recent pericenter passage have not inflated the apparent M/L's.
Piatek Slawomir
Pryor Carlton
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