Collimated high-energy photons and others possible observational effects of the photon angular and spectral distribution in gamma-ray bursts sources

Details Collimated high-energy photons and others possible observational effects of the photon angular and spectral distribution in gamma-ray bursts sources Collimated high-energy photons and others possible observational effects of the photon angular and spectral distribution in gamma-ray bursts sources

2004-10-14

arxiv.org/abs/astro-ph/0410350v4

Bull. Spec. Astrophys. Obs., 2005, 59, 5-17

Astronomy and Astrophysics

Astrophysics

he modified version for the journal. Two paragraphs were corrected near formula (1)

Scientific paper

Typical observational gamma-ray burst (GRB) spectra are discussed and, in this connection, what is the origin of the compactness problem and how it was solved at first. If the threshold for $e^{-}e^{+}$ pair production depends on an angle between photon momenta, then another solution of the compactness problem is possible. We discuss a possibility of the $\gamma$-rays collimation and the dependence of photon beaming on photon energies. The list of basic assumptions of the scenario describing the GRB source with energy $< 10^{49}$ ergs are adduced: the matter is about an alternative to the ultrarelativistic fireball if {\it all} long-duration GRBs are related or physically connected with {\it normal/unpeculiar} core-collapse supernovae (SNe). Namely, we consider the questions about radiation pressure and how the jet arises on account of even small asymmetry of the radiation field in a compact GRB source. The possibility of a new approach to explanation of GRB phenomenon is shown. Possible mechanisms of their generation in regions of size $< 10^8$cm are discussed (a compact model of GRBs). Observational consequences of the compact GRB energy release are considered.

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