Abstract Details
| Name: Rukaiya Khatoon Affiliation: Tezpur University Conference ID: ASI2018_1559 Title : Probing the origin of high energy variability in Blazars Authors and Co-Authors : Prof. Ranjeev Misra, IUCAA Dr. Sunder Sahayanathan, BARC,Mumbai Dr. Atreyee Sinha, Paris Observatory Abstract Type : Poster Abstract Category : Extragalactic astronomy Abstract : We study the temporal behaviour of the non-thermal emission from blazars, when the underlying particle acceleration process is time dependent. To model the emission from the blazar jet, we consider a scenario where electrons accelerated at a shock front, escapes into the downstream region and lose their energy through radiative processes. Analogously, we consider two-zones, namely, the acceleration region (AR), the region around the shock front, and the cooling region (CR), the region downstream. The electrons are accelerated in AR, at a rate defined by a characteristic acceleration time scale, and in the cooling region they lose their energy through synchrotron emission mechanism in a constant and homogeneous magnetic field. To study the effect of acceleration process on the observed flux, a Gaussian perturbation on the acceleration time scale is introduced and the evolution of the resultant particle distribution in the cooling region is obtained. We show through the present study that a Gaussian perturbation in the acceleration timescale can give rise to a log-normal particle distribution at high-energies, imitating a multiplicative process. Such log-normal flux distribution are often observed in long duration blazar light curves and are usually attributed to disk-jet coupling akin to disk emission from microquasars. Additionally, our result shows a less skewed distribution(i.e., neither Gaussian nor log-normal) while introducing a Gaussian distribution on the escape time-scale in the acceleration region. In the future work, we propose to compare these theoretical findings with the observational results from different blazars. |