Multi-wavelength spectral modelling of the candidate neutrino blazar PKS 0735+178

• DOI: 10.48550/arxiv.2401.12680
• Publication Date: 2024-01-01
• Authors: Athira M. Bharathan; C. S. Stalin; S. Sahayanathan; Subir Bhattacharyya; Blesson Mathew
• Keywords: BL Lac object; Spectral energy distribution

The BL Lac object PKS 0735+178 was in its historic $\gamma$-ray brightness state during December 2021. This period also coincides with the detection of a neutrino event IC211208A, which localized close to vicinity 0735+178. We carried out detailed timing and spectral analysis source three epochs (a) quiescent ($E_{1}$), (b) moderate activity ($E_{2}$) (c) high ($E_{3}$) coincident epoch detection. During ($E_{3}$), we found largest variability amplitude 95%. spectra corresponding these are well fit by power law model is show variations softer when brighter trend. In $E_{3}$, shortest flux doubling/halving time 5.75 hrs. Even though energy distribution could be modeled one-zone leptonic emission model, required an additional component radiation over above component. Here that photo-meson process needed explain excess hundreds GeV not accounted for synchrotron self-Compton process.