Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe..62d&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
For stellar progenitors of cosmological gamma-ray bursts, the temperature of central source, T, exceeds the threshold value for nuclei dissociation. Free neutrons are accelerated by proton stream to ultrarelativistic velocity. Neutron and proton streams have comparable power and split up (achieving relative velocity larger than 0.5c) at a radius where Lorentz factor Gamma(R) of a fireball becomes greater than ~= T/5 keV. The critical value of Lorentz factor is estimated to lie in the range expected for cosmological GRBs, Gamma ~500, so there possibly exist two different populations of bursts. Velocity splitting leads to production of pions, observable emission of ~100 GeV photons and formation of electron-positron photosphere with nearly invariant temperature, 100-200 eV. Also, neutrons can change (after beta-decay) the dynamics of electron-proton shock, giving rise to bimodal distribution of bursts' durations.
Derishev Evgeny V.
Kocharovsky Vitaly V.
Kocharovsky Vl. V.
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