Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975nyasa.262..181b&link_type=abstract
(AAS, American Physical Society, and New York Academy of Sciences, Texas Symposium on Relativistic Astrophysics, 7th, Dallas, Te
Astronomy and Astrophysics
Astrophysics
8
Astronomical Models, Astrophysics, Neutrinos, Neutron Stars, Absorption Spectra, Equations Of State, Galactic Clusters, Gravitational Collapse, Hot Stars, Missing Mass (Astrophysics), Particle Flux Density, Pulsars, Stellar Evolution, Stellar Gravitation, Stellar Luminosity
Scientific paper
Neutrino emission and absorption processes relevant to collapsing or bouncing stars are reviewed, and a simple analytic model is presented for radiation from a very hot pulsating neutron star. The causality and luminosity limits on the neutrino fluxes and burst widths to be expected from spherical astronomic sources are examined. A discussion of the dynamics of rich clusters of galaxies shows that the missing mass cannot be attached to massive superhalos around the galaxies but must lie in intergalactic objects of lesser mass; the cluster-missing mass cannot lie in a degenerate superstar of small-mass neutrinos. The equation of state of a hot neutron star formed by collapse of a degenerate core is analyzed. A major conclusion is that a simple neutrino diffusion model is generally correct, but that the Fermi statistics and the energy dependence of weak cross sections entail substantial differences between photon- and neutrino-emitting stars.
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