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We describe the time-dependent radiation transfer in blazar jets, within theinternal shock model. We assume that the central engine, which consists of ablack hole and an accretion disk, spews out relativistic shells of plasma withdifferent velocity, mass, and energy. We consider a single inelastic collisionbetween a faster (inner) and a slower (outer) moving shell. We study thedynamics of the collision and evaluate the subsequent emission of radiation viathe synchrotron and synchrotron self Compton (SSC) processes after theinteraction between the two shells has begun. The collision results in theformation of a forward shock (FS) and a reverse shock (RS) that convert theordered bulk kinetic energy of the shells into magnetic field energy andaccelerate the particles, which then radiate. We assume a cylindrical geometryfor the emission region of the jet. We treat the self-consistent radiativetransfer by taking into account the inhomogeneity in the photon densitythroughout the region. In this paper, we focus on understanding the effects ofvarying relevant input parameters on the simulated spectral energy distribution(SED) and spectral variability patterns.

Time-dependent Radiation Transfer in the Internal Shock Model Scenario for Blazar Jets