Study of Temporal and Spectral variability for Blazar PKS 1830-211 with Multiwavelength Data

Abstract

A study of the gravitationally lensed blazar PKS 1830-211 was carried out using multi-wave band data collected by Fermi-LAT, Swift-XRT, and Swift-UVOT telescopes between MJD 58400 to MJD 58800 (2018 October 9-2019 November 13). Flaring states were identified by analyzing the gamma-ray light curve. Simultaneous multi-wave band spectral energy distributions (SEDs) were obtained for these flaring periods. A cross-correlation analysis of the multi-wave band data was carried out, which suggested a common origin of the gamma-ray and X-ray emission. The broadband emission mechanism was studied by modeling the SED using a leptonic model. Physical parameters of the blazar were estimated from the broadband SED modeling. The blazar PKS 1830-211 is gravitationally lensed by at least two galaxies and has been extensively studied in the literature because of this property. The self-correlation of the gamma-ray light curve was studied to identify the signature of lensing, but no conclusive evidence of correlation was found at the expected time delay of 26 days.