4C+28.07 is a γ-ray Flat Spectrum Radio Quasar (FSRQ) type source. It is often monitored at different frequencies, though long-term multi-wavelength data of this source have not been modelled in detail before. We have analyzed ∼12 years (Aug, 2008 - May, 2020) of Fermi-LAT data with a binning of 10 days time scale and observed three distinctive flaring states. Each flaring state consists of different phases of activity, namely, pre-flare, flare \& post-flare regions. γ-ray spectral analysis of these different activity phases has been performed and the best fit model for its spectra is found to be a Log-parabola model. We have also studied the correlation of simultaneous γ-ray light curves with the optical \& radio counterparts in these flaring states and report the DCF with a 95\% significance level. A large time delay is found between radio and gamma-ray data for two flares, indicating two zones of emission. We have fitted the multi-wavelength data with a two-zone leptonic model. In our two-zone leptonic model, the maximum required power in the jet is 9.64 × 1046 erg sec−1, which is lower than its Eddington luminosity 2.29×1047 erg sec−1.
@article{arxiv.2107.10555,
title = {Multi wavelength study of 4C+28.07},
author = {Avik Kumar Das and Raj Prince and Nayantara Gupta},
journal= {arXiv preprint arXiv:2107.10555},
year = {2021}
}
Comments
23 pages, 16 figures, Accepted for publication in ApJ