TY - JOUR T1 - On the multiwavelength emission from gamma ray burst afterglows Y1 - 2009 A1 - Petropoulou, M. A1 - Mastichiadis, A. KW - acceleration of particles KW - Astrophysics - High Energy Astrophysical Phenomena KW - Gamma Rays: Bursts KW - radiation mechanisms: non-thermal AB - Aims: Drawing an analogy with active galactic nuclei, we investigate the one-zone synchrotron self-compton (SSC) model of gamma ray bursts (GRB) afterglows in the presence of electron injection and cooling both by synchrotron and SSC losses.
Methods: We solve the spatially averaged kinetic equations which describe the simultaneous evolution of particles and photons, obtaining the multi-wavelength spectrum as a function of time. We back up our numerical calculations with analytical solutions of the equations using various profiles of the magnetic field evolution under certain simplifying assumptions.
Results: We apply the model to the afterglow evolution of GRBs in a uniform density environment and examine the impact various parameters have on the multiwavelength spectra. We find that in cases where the electron injection and/or the ambient density is high, the losses are dominated by SSC and the solutions depart significantly from the ones derived in the synchrotron standard cases. VL - 507 SN - 0004-6361 UR - https://ui.adsabs.harvard.edu/abs/2009A&A...507..599P JO - Astronomy and Astrophysics ER -