"Are Blazars sources of High energy neutrinos?"

Dr. Sarira Sahu, ICN-UNAM

On 22nd of September 2017, the IceCube neutrino observatory detected a track-like neutrino event with energy ~ 290 TeV (IceCube-170922A). This neutrino event is spatially and temporally associated with TXS 0506+056, a blazar at a redshift of z=0.3365 which was in a flaring state in the gamma-ray energy range at that very moment. Extensive follow-up observations from radio to TeV energy bands revealed that the blazar TXS 0506+056 was active during this period and enhanced emission in all these energy bands were observed, notably the GeV emission is found to be at high state as observed by Fermi-LAT. Also for the first time very high energy (VHE) gamma-rays above 100 GeV were observed by MAGIC telescopes from the same object. In the context of the photohadronic model I shall analyze this blazar to explain the high energy gamma-ray and the neutrino spectra.