The nature of the intrinsic spectra from the VHE emission of H 2356-309 and 1ES 1101-232

Abstract

were analyzed to derive strong upper limits on the EBL, which were found to be consistent with the lower limits from the integrated light of resolved galaxies. Here we have used the photohadronic model corroborated by two template EBL models to fit the observed VHE gamma-ray data from these two HBLs and to predict their intrinsic spectra. We obtain very good fit to the VHE spectra of these two HBLs. However, the predicted intrinsic spectra are different for each EBL model. For the HBL H 2356-309, we obtain a flat intrinsic spectrum and for 1ES 1101-232 the spectrum is mildly harder than 2 but much softer than 1.5.

Photohadronic modelling of the 2010 gamma-ray flare from Mrk 421

“…There is also PKS B1424-418, a Flat Spectrum Radio Quasar that was in temporal and positional coincidence with a high-energy starting event (HESE) on 2012 December, a cascade-like event with a reconstructed energy of 2 PeV but a median positional uncertainty of ∼16 • that gives an estimated ∼ 5% chance of coincidence (Kadler et al 2016). In addition, there are several studies searching for gamma-ray counterparts and predicting consistent limits within the IC neutrino flux so far (Krauß et al 2014(Krauß et al , 2015Brown, Adams & Chadwick 2015;Glüsenkamp 2016;Padovani et al 2016); the successful SED modelling of blazars during flaring episodes using hadronic models (Mücke & Protheroe 2001;Diltz, Böttcher & Fossati 2015;Diltz & Böttcher 2016;Sahu, de León & Miranda 2017;Sahu, de León & Nagataki 2018a;Sahu et al 2018b); and hadronic emission has been proposed as an explanation for the spectral hardening in TeV energy gamma-ray spectra, behaviour which has been observed in some blazars [e.g. W Comae, 3C 66A (Böttcher et al 2013), 1ES 0229+200 (Tavecchio et al 2009), 1ES 1101-232 and H 2356-309 (Aharonian et al 2006)].…”