Abstract Details

Name: DEBBIJOY BHATTACHARYA
Affiliation: Manipal Centre for Natural Sciences, Manipal Academy of Higher Education
Conference ID: ASI2021_531
Title : Multi-band study of different flaring and low-activity states of blazar 4C+21.35
Authors and Co-Authors : Debbijoy Bhattacharya (Manipal Centre for Natural Sciences, Manipal Academy of Higher Education), Krishna Mohana A (Manipal Centre for Natural Sciences, Manipal Academy of Higher Education), S. Bhattacharyya (Bhabha Atomic Research Centre), Nilay Bhatt (Bhabha Atomic Research Centre), C.S. Stalin (Indian Institute of Astrophysics)
Abstract Type : Oral
Abstract Category : Extragalactic Astronomy
Abstract : Blazars, a class of active galactic nuclei emit over the entire electromagnetic spectrum and modelling of their broadband spectral energy distribution (SED) is the key to constrain the underlying emission mechanisms. Here we present the one-zone leptonic emission modelling results of the blazar 4C +21.35 using multi-wavelength data spanning over 2008 - 2018. Broadband SED modelling using gamma-ray data from Fermi-Large Area Telescope, X-ray data from Swift-XRT, AstroSat, UV-Optical data from Swift-UVOT, AstroSat, and Catalina Real-Time Transient Survey was carried out at seven different epochs, including three gamma-ray flaring episodes and four quiescent periods (three long-term averaged ones and one during AstroSat observing period). Our SED modelling suggests that two compact emission regions originating at a different time outside the broad-line region and moving away from the core with variation primarily in the jet electron spectra can explain the emission from the high, moderate, and low activity periods. The emissions from high and first low activity states are likely to have originated in the first region. The moderate and second low activity states are likely due to the second emission region with fresh particle acceleration/injection at a later time. The findings of this work have been published recently (https://doi.org/10.1093/mnras/staa2958).