Abstract
Abstract We consider a general model for the quasi-spherical explosion in which a part of the explosion energy is thermalized, forming expanding photosphere around a compact object, and the second part of energy is taken by the expanding shell of material which forms a shock wave in the surrounding medium. Different types of particles (electrons, hadrons) can be in principle accelerated at the shock. They interact with the thermal radiation from the photosphere and also with the material at the shell. We determine the equilibrium spectra of particles in the shell as a function of time after explosion and calculate the time dependent γ-ray spectra by taking into account the effects which are due to the anisotropy of the photo-spheric radiation field on the Inverse Compton (IC) process and also include the absorption of IC γ-rays in the photosphere radiation. We conclude that in principle both, leptonic and hadronic, models can explain the GeV-TeV gamma-ray emission recently detected from the Nova RS Oph. However, hadronic model, in comparison to leptonic model, is more energetically demanding and requires much stronger magnetization of the nova shell.
Published Version
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