Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975neas.book.....b&link_type=abstract
Presented at 7th Tex. Symp. on Relativistic Astrophys., Dallas, 17 Dec. 1974
Astronomy and Astrophysics
Astrophysics
Neutrinos, Stellar Radiation, Astrophysics, Flux (Rate), Galactic Clusters, Mass Distribution, Missing Mass (Astrophysics), Neutron Stars, Scattering Cross Sections, Stellar Evolution
Scientific paper
Neutrino or antineutrino emission from collapsing or bouncing stars is considered. Up to 10 to the 15th power GM to the 15th power cm, a hot neutron fluid behaves like an ideal gas and the neutron-proton ratio is generally less than that of a cold neutron star. The neutrino diffusion approximation is expected to be valid down to eupsilon equals 8 MeV, but the Fermi statistics and the energy dependence of weak cross-sections lead to important differences between photon and neutrino emitting stars. From the energy release in collapse of a degenerate core to neutron star radius and the dynamics of free-fall, a period T approximately 1 ns and pulse width DELTA I greater than 14 mu s is expected. The dynamics of rich clusters of galaxies is discussed. It is shown that the cluster missing mass cannot be attached to massive superhalos about the galaxies but must be in intergalactic objects of lower mass.
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