Multiwavelength study of different flaring and low-activity states of blazar 4C+21.35

Author:

Bhattacharya Debbijoy1ORCID,Mohana A Krishna1ORCID,Bhattacharyya Subir23ORCID,Bhatt Nilay2ORCID,Stalin C S4ORCID

Affiliation:

1. Manipal Centre for Natural Sciences, Centre of Excellence, Manipal Academy of Higher Education, Manipal 576104, Karnataka, India

2. Bhabha Atomic Research Centre, Mumbai 400085, Maharashtra, India

3. Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, Maharashtra, India

4. Indian Institute of Astrophysics, Bangalore 560034, Karnataka, India

Abstract

ABSTRACT Blazars, a class of active galactic nuclei, emit over the entire accessible electromagnetic spectrum and modelling of their broad-band spectral energy distribution (SED) is the key to constrain the underlying emission mechanisms. Here we report the results on the one-zone leptonic emission modelling carried out on the blazar 4C+21.35 using multiwavelength data spanning over the period 2008–2018. Broad-band SED modelling using γ-ray data from Fermi-Large Area Telescope, X-ray data from Swift-XRT and AstroSat, and UV–optical data from Swift-UVOT, AstroSat, and Catalina Real-Time Transient Survey was carried out at seven different epochs, including three γ-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.

Funder

Indian Space Research Organisation

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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