Abstract Details

Name: Arkadipta Sarkar
Affiliation: Tata Institute of Fundamental Research
Conference ID: ASI2021_223
Title : Origin of multi-waveband flares in 3C 454.3
Authors and Co-Authors : Arkadipta Sarkar[1], Abhradeep Roy[1], Anshu Chatterjee[1], Sonal R. Patel[2], Amit Shukla[3], Varsha R. Chitnis[1], Alok C. Gupta[4] and Paul J. Wiita[5]. [1] Department of High Energy Physics, Tata Institute of Fundamental Research, Mumbai 400005, India [2] Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany [3] Indian Institute of Technology Indore, Indore 453552, India [4] Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, Nainital 263001, India [5] Department of Physics, The College of New Jersey, PO Box 7718, Ewing, NJ 08628-0718, USA
Abstract Type : Oral
Abstract Category : Extragalactic Astronomy
Abstract : We have performed an extensive study to understand the origin of the multi-waveband flares in the blazar 3C 454.3. We identified three multi-waveband flares in the long-term light curve of the source, and our analysis was restricted to 150 days around its peak. Bayesian block algorithm was used to model the structure of the flare and to quantify its variability. We then generated broadband spectral energy distributions in each of the blocks and modelled it using a one-zone leptonic model under the assumption that a single blob is responsible for the entire emission during the flare period. The evolution of physical parameters of the blob could then be traced along the duration of the flares. We found that emissions from a blob filling the cross-section of a conical jet could not explain the observed multi-waveband emission. The statistically favorable model involves a non-linear motion of the blob inside the jet which changes jet related parameters (like Doppler boosting and magnetic field) thereby changing the observed flux. Other models considered include one where the particle injection parameters change over time for a blob moving in a conical jet, and one where both the particle injection parameters and jet parameters change. We have also tried to recreate the multi-waveband light curve from the model.