Computer Science
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phdt........16p&link_type=abstract
PhD Dissertation, Rutgers - The State Univ. New Brunswick, NJ United States
Computer Science
Dwarf Galaxies, Galactic Clusters, Mass To Light Ratios, Tides, Galactic Radiation, Dark Matter, Brightness
Scientific paper
The galactic dwarf spheroidal galaxies (dSphs) have unusually large mass-to-light ratios (M/L's), which indicate that these galaxies either contain a great deal of dark matter or are not in virial equilibrium. We have used numerical simulations to investigate whether galactic tides can inflate the apparent M/L in a dSph. In our simulation, the dSph is comprised of only luminous matter and has a M/LV of either 1 or 3. We assume a close encounter with the Galaxy, producing strong tides that greatly alter the structure and kinematics of the dSph. We find that even if the dSph is almost totally destroyed, there is no appreciable change in 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. We compare the results of our simulations to real dSphs and conclude that tides at the most recent pericenter passage have not inflated the apparent M/L's. We have also analyzed the surface brightness and velocity data for the globular cluster M107 to derive its M/L and determine the slope of the power-law mass function by fitting single- and multi-component King models to our velocity data and to existing surface-brightness profiles. In addition, we fitted models which have the galactic disk mass-function. Determining the M/L and the slope of the power-law mass function is not robust one model that is an acceptable fit to the data. However, the possible ranges for the central and global M/L are small initial mass-function fit the data poorly, which suggests that the galactic disk and M107 initial mass functions were different.
No associations
LandOfFree
Mass-to-Light Ratios in Dwarf Spheroidal Galaxies and Globular Clusters does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Mass-to-Light Ratios in Dwarf Spheroidal Galaxies and Globular Clusters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mass-to-Light Ratios in Dwarf Spheroidal Galaxies and Globular Clusters will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1685014