Spectral Modeling of Flares in Long Term Gamma-Ray Light Curve of PKS 0903-57

TL;DR

This study analyzes 12 years of Fermi LAT data on PKS 0903-57, identifying gamma-ray flares and modeling their spectral energy distributions to understand jet physics, highlighting the need for more multi-wavelength observations.

Contribution

First detailed temporal and spectral analysis of PKS 0903-57 using long-term gamma-ray data with leptonic modeling of flares.

Findings

Identified two major gamma-ray flares in 2018 and 2020.

Estimated variability timescales, magnetic fields, and jet power.

Observed sub-structures within the flares.

Abstract

A detailed study of the BL Lacertae PKS 0903-57 has been done for the first time with 12 years of Fermi Large Area Telescope data. We have identified two bright gamma-ray flares in 2018 and 2020. Many sub-structures were observed during multiple time binning of these flares. We have performed detailed temporal and spectral study on all the sub-structures separately. A single-zone emission model is used for time-dependent leptonic modeling of the multi-wavelength spectral energy distributions. Our estimated values of variability time scale, magnetic field in the emission region, jet power obtained from leptonic modeling of PKS 0903-57 are presented in this work. Currently, we have a minimal number of observations in X-rays and other bands. Hence, more simultaneous multi-wavelength monitoring of this source is required to have a better understanding of the physical processes happening in the jet of the blazar PKS 0903-57.