Speaker
Description
In the recent years Seyferts have emerged as a promising class of objects to be associated with IceCube neutrinos. These objects host several sites that can accelerate particles such as the AGN disk-corona, jets, bubbles and winds, along with starburst regions observed in several of the candidates. In this talk we examine the VHE gamma ray emission of this class of objects. This electromagnetic energy range is essential in characterizing the environment of neutrino production as hadronic production of neutrinos should yield gamma rays of comparable energies and fluxes. The VHE gamma ray sensitivity of IACTs such as MAGIC partially overlaps with the energy range of the observed neutrinos from such sources. Thus, the non detection of VHE emission after 125 hours of observation of MAGIC of the most significant neutrino hotspot, the prototypical Seyfert 2 NGC 1068 signals that the neutrino production site might be within a radiation dense environment opaque to gamma rays.
In this talk we explore the environments of other Seyferts. Focusing on NGC 4151 observed by MAGIC, we use opacity arguments to constrain emission region to 10^4 R_g. We also investigate the observed GeV gamma ray emission of Seyferts, considering as well, the possibility that it originates from alternative acceleration sites, such as starburst regions.
