Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981nyasa.375..157p&link_type=abstract
(AAS, American Physical Society, NASA, et al., Texas Symposium on Relativistic Astrophysics, 10th, Baltimore, MD, Dec. 15-19, 19
Astronomy and Astrophysics
Astrophysics
12
Big Bang Cosmology, Galaxies, Mass Distribution, Space Density, Universe, Elliptical Galaxies, Galactic Clusters, Missing Mass (Astrophysics), Neutrinos, Spiral Galaxies, Stellar Mass
Scientific paper
The progress made to date in estimating the contribution to Omega by mass concentrated in and around galaxies is assessed. After consideration of the mass of individual galaxies and of groups of galaxies, the question as to what substance makes the greatest contribution to the mass of the universe is addressed. Low mass stars, and a sea of neutrinos whose masses are some tens of eV, left over from the big bang, are proposed as attractive candidates. It is suggested that the question will be clarified only after progress has been made toward the solution of the missing mass problem. This calls for the determination of whether: (1) massive envelopes of spiral and elliptical galaxies extend beyond about 100 kpc, and (2) massive envelopes of clusters of galaxies extend well beyond about 500/h kpc.
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