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Title:
A new determination of the halo luminosity density of the galaxy
Authors:
Richstone, D. O.; Graham, F. G.
Affiliation:
AA(Michigan, University, Ann Arbor, MI), AB(Pittsburgh, University, Pittsburgh, PA)
Publication:
Astrophysical Journal, Part 1, vol. 248, Sept. 1, 1981, p. 516-523. Research supported by the Research Corp.; (ApJ Homepage)
Publication Date:
09/1981
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
Galactic Radiation, Milky Way Galaxy, Star Distribution, Stellar Luminosity, Stellar Motions, Astronomical Models, Distribution Functions, Stellar Mass, Stellar Structure, Velocity Distribution
DOI:
10.1086/159176
Bibliographic Code:
1981ApJ...248..516R

Abstract

The distribution of tangential velocities for arbitrary halo velocity dispersions and rotation rates are explicitly computed, assuming a particular form of the halo velocity distribution function near the sun. It is found that for a specific model of the halo velocity dispersion tensor that Schmidt's (1975) estimate of the mass carried by halo stars of 0.25-0.70 solar masses should be revised by a factor of between 1.0 and 2.0, depending on the rotation rate of the halo. Although obtaining a mass density in all stars from the stellar density in that mass range is extremely uncertain, it is found, in agreement with earlier work, that even under rather extreme assumptions about the remnants the observed stars and expected remnants fail to provide the theoretically expected mass. Comparison of the luminosity to the theoretical mass yields a mass to light ratio consistent with that of rich clusters of galaxies.

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