Ponente
Descripción
IceCube's recent studies of one of the nearest Seyfert galaxies--the Circinus galaxy--suggest that it is a new candidate source of high-energy neutrinos, with a pre-trial significance reaching
3$\sigma$. As a Compton-thick AGN with a column density of $n_{\rm H} \sim 4 \times 10^{24}\rm~cm^{-2}$, the Circinus galaxy strongly obscures the photons produced near its core. To understand the physical origin of high-energy neutrinos from Circinus, it is essential to characterize the distribution of ambient matter and photon fields near the neutrino production site. The Circinus galaxy hosts a complex environment consisting of a corona, an accretion disk, a dust torus, and contaminating point sources, which can influence leptohadronic processes and, consequently, neutrino and gamma-ray production. We consider two distinct regions in our modeling. In this study, we perform leptohadronic simulations and combine observed multi-wavelength and neutrino data to constrain the relevant physical parameters. We also discuss the broader implications of our findings for the contribution of sources with properties similar to those of the Circinus galaxy to the diffuse high-energy neutrino background.
