Speaker
Description
The origins of the cosmic neutrino background (CNB) and the cosmic gamma-ray background (CGB) remain uncertain. Accretion disk winds driven by active galactic nuclei (AGNs) have been proposed as possible contributors, but the background contribution they are predicted to make depends sensitively on poorly constrained wind energetics and ambient densities. In this contribution, I will revisit the AGN disk-wind scenario by constructing a lepto-hadronic wind model calibrated against radio and GeV gamma-ray fluxes of nearby Fermi-LAT-detected Seyfert galaxies. In this framework, cosmic rays are accelerated at both the wind-driven forward and reverse shocks, and then produce synchrotron, external Compton, and hadronic gamma-ray emission. Applying our calibrated lepto-hadronic models to an AGN population synthesis model, we find that disk winds contribute at most $\lesssim 5\%$ of the CGB above 10 GeV and $\lesssim 10\%$ of the CNB around 100 TeV.
