Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-10-08
Int.J.Mod.Phys. D14 (2005) 131-142
Astronomy and Astrophysics
Astrophysics
11 pages, 3 figures, to appear on Int.J.Mod.Phys.D
Scientific paper
10.1142/S0218271805006146
We present theoretical predictions for the spectral, temporal and intensity signatures of the electromagnetic radiation emitted during the process of the gravitational collapse of a stellar core to a black hole, during which electromagnetic field strengths rise over the critical value for $e^+e^-$ pair creation. The last phases of this gravitational collapse are studied, leading to the formation of a black hole with a subcritical electromagnetic field, likely with zero charge, and an outgoing pulse of initially optically thick $e^+e^-$-photon plasma. Such a pulse reaches transparency at Lorentz gamma factors of $10^2$--$10^4$. We find a clear signature in the outgoing electromagnetic signal, drifting from a soft to a hard spectrum, on very precise time-scales and with a very specific intensity modulation. The relevance of these theoretical results for the understanding of short gamma-ray bursts is outlined.
Fraschetti Federico
Ruffini Remo
Vitagliano Luca
Xue She-Sheng
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