Physics
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986rspta.320..465b&link_type=abstract
(Royal Society Discussion on Material Content of the Universe, London, England, Oct. 23, 24, 1985) Royal Society (London), Philo
Physics
1
Dark Matter, Mass To Light Ratios, Stellar Luminosity, Stellar Mass, Disk Galaxies, Elliptical Galaxies, Hydrogen Clouds, Night Sky, Sky Brightness
Scientific paper
Stars that between them contain a very small proportion of the mass in a typical stellar population, generate the bulk of the population's luminosity. Consequently, the overall mass:light ratio Gamma of the population depends on exactly how much of the population's mass is in luminous stars, and it would not be surprising if stellar populations that formed in different physical conditions were characterized by very different values of Gamma. Actually, the well-observed regions of galaxies show minimal variation of Gamma. It is argued that even the most extended H I rotation curves could be understood in terms of constant Gamma if estimates of the brightness of the night sky were subject to systematic errors in the region of 4-8 percent.
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