Likely Physical Mechanism Behind Cosmic Gamma Ray Bursts

Details Likely Physical Mechanism Behind Cosmic Gamma Ray Bursts Likely Physical Mechanism Behind Cosmic Gamma Ray Bursts

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe..71m&link_type=abstract

Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:

Astronomy and Astrophysics

Astrophysics

Scientific paper

Since the estimated energy output for GRB971214 is Q_gamma ~3 times 1053ergs in soft gamma-rays alone, it is conceivable that the actual energy output in the preceding neutrino burst is higher by two orders, i.e, Q_nu ~1055 ergs (Mitra, A & A, in press, astro-ph / 9807197). We propose that such an energy liberation is easily explained by considering gravitational collapse of a stellar core of initial mass M_i few Modot to a stage of final gravitational mass M_f = M_i -Q_nu. This is possible because, we have recently shown that for General Relativistic Gravitational collapse, no trapped surface is formed, and for contined collapse, the absolute upper limit on the value of the radiated energy is Q --> M_i c^2 (Mitra, astro-ph/9803013, 9803014). We shall discuss that this energy emission is not necessarily accompanied by a strong nu- driven wind. Consequently, it may be possible that this process generates a highly relativistic e^- e^+ gamma fireball.

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