Seyfert galaxies produce observed TeV neutrinos via proton-proton collisions in outflow-cloud bow shocks and can account for a substantial fraction of the diffuse astrophysical neutrino background at 10^4-10^5 GeV.
Hard X--ray detection of NGC 1068 with BeppoSAX
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abstract
We report on the first detection above ~10 keV of the archetypal Compton-thick Seyfert 2 galaxy NGC 1068. This detection, obtained with the PDS instrument onboard BeppoSAX in the 20-100 keV range, confirms the hardness of the X--ray spectrum above a few keV (as indicated by ASCA observations and supports models envisaging a mixture of both neutral and ionized reflections of an otherwise invisible nuclear continuum, the neutral reflection component being the dominant one in hard X-rays.
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Seyfert Galaxies as Neutrino Sources: An Outflow$-$Cloud Interaction Perspective
Seyfert galaxies produce observed TeV neutrinos via proton-proton collisions in outflow-cloud bow shocks and can account for a substantial fraction of the diffuse astrophysical neutrino background at 10^4-10^5 GeV.