Upper bounds on the neutrino burst from collapse of a neutron star into a black hole

Details Upper bounds on the neutrino burst from collapse of a neutron star into a black hole Upper bounds on the neutrino burst from collapse of a neutron star into a black hole

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...271..187g&link_type=abstract

Astronomy and Astrophysics, Vol. 271, p. 187 (1993)

Astronomy and Astrophysics

Astrophysics

28

Dense Matter, Gravitation, Relativity, Stars: Neutron

Scientific paper

Neutrino burst accompanying the collapse of a neutron star into a black hole is studied. Such a collapse is expected to happen, when the mass of an accreting neutron star exceeds the maximum value allowed by general relativity. A collapsing neutron star has a baryon number very close to the maximum value allowed for the assumed equation of state of dense matter. Neutrinos are produced mainly via non-equilibrium weak interaction processes in the interior of the collapsing star. General relativistic equations, describing hydrodynamics of collapse and the propagation of neutrinos, are derived in the simplest case of stellar matter transparent to neutrinos. Thermal effects in collapsing matter are studied. Heating of collapsing stellar interior is due mainly to non-equilibrium weak interaction processes. Numerical simulations are performed for several models of dense matter. The predicted neutrino burst has a duration of a fraction of millisecond. Its total energy and the dominating neutrino flavor are model dependent. In the scenarios most favorable to the detection of the burst, the total energy of the burst of ‾ve, as measured by a distant observer, is a few times 1050 erg. Due to the strong gravitational and Doppler red shift of emitted neutrinos, their mean energy at infinity ˜4 MeV. The results obtained should be considered as upper bounds for the neutrino luminosity and total energy of the neutrino burst. Inclusion of neutrino opacity will reduce the luminosity of the burst, and will decrease the average energy of neutrinos at infinity. The neutrino burst accompanying the gravitational collapse of a neutron star into a black hole, at a distance of a few kiloparsecs, is thus unlikely to be detected by the contemporary neutrino detectors on Earth.

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