Abstract Details
| Name: Nagendra Kumar Affiliation: IISc, Bengaluru Conference ID: ASI2019_223 Title : A continuous Jet Leptonic model for Blazar SEDs - a Monte Carlo study for cylindrical Jet Authors and Co-Authors : Kumar Nagendra, Kushwaha Pankaj, Mukhopadhyay Banibrata Abstract Type : Poster Abstract Category : Extragalactic Astronomy Abstract : The broadband spectra (or spectral energy distribution SED) of blazar is extended from radio to gamma-ray energy band. The radio observations of blazar establish that blazar have core-jet structure, and the observed apparent superluminal motion of jet show that radio-emitting plasma (synchrotron-emitting electrons) has relativistic speed and beamed towards the observer. It is believed that gamma-ray emission is due to the same relativistic electron population which is responsible for radio. Also during gamma-ray flaring the core radio emission is correlated with gamma-ray emission. We aim to discuss a model for blazars SED in continuous jet scenario (i.e., relativistic electrons are in outflow which is contrary to the favorable ``one-zone model''), where the radiative process for lower peak of the blazar SED (in $\nu$F$_{\nu}$ plot) is a synchrotron emission and high-energy peak is due to a inverse Compton process (similar to the one-zone model). In addition to the outflowing relativistic electrons we assume that these electrons also have comparatively low random speed. As we are dealing with two components of electrons velocity simultaneously, so for inverse Compton process we consider a generalized bulk Comptonization (in this formalism, both velocities can have random directions). For computing the generalized bulk Comptonized spectra we adopt a Monte Carlo methods and consider a cylindrical geometry of the emission region. We find that for reasonable range of the ratio of height to radius of cylindrical geometry (H/R) the blazars (FSRQ and BL Lacs objects) SED can be SSC (synchrotron self Compton) dominated only. |