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J/ApJ/516/693 Mass-to-light ratio of binary galaxies (Honma, 1999)
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Beginning of ReadMe :J/ApJ/516/693 Mass-to-light ratio of binary galaxies (Honma, 1999)
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The mass-to-light ratio of binary galaxies
Honma M.
<Astrophys. J. 516, 693 (1999)>
=1999ApJ...516..693H
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ADC_Keywords: Galaxies, nearby ; Surveys
Keywords: galaxies: fundamental parameters - galaxies: kinematics and dynamics
Abstract:
We report on the mass-to-light ratio determination based on a newly
selected binary galaxy sample, which includes a large number of pairs
whose separations exceed a few hundred kpc. The probability
distributions of the projected separation and the velocity difference
have been calculated considering the contamination of optical pairs,
and the mass-to-light (M/L) ratio has been determined based on the
maximum likelihood method. The best estimate of the M/L in the B band
for 57 pairs is found to be 28 - 36 depending on the orbital
parameters and the distribution of optical pairs (solar unit: H_o_ =
50 km s^-1^ Mpc^-1^). The best estimate of the M/L for 30 pure spiral
pairs is found to be 12 - 16. These results are relatively smaller
than those obtained in previous studies but are consistent with each
other within the errors. Although the number of pairs with large
separation is significantly increased compared with previous samples,
the M/L does not show any tendency of increase but is found to be
almost independent of the separation of pairs beyond 100 kpc. The
constancy of the M/L beyond 100 kpc may indicate that the typical halo
size of spiral galaxies is less than 100 kpc.
See also: