arXiv subjects

Simon Sotirov

Publications and source records attributed to Simon Sotirov.

2 recordsLinked to original sources

arXiv2024

TeV to PeV neutrinos from AGN coronae

In this paper, we attempt to explain the TeV - sub PeV neutrinos observed by IceCube assuming that their sources are active galactic nuclei (AGN). The results are obtained in the model where the thermal accretion disc emits in the UV-optical range inside the hot electron plasma cloud. We focus on the analytical solution for the comptonization problem obtained from consideration at the microscopic level and try to avoid fitting the coronal spectrum from spectral observations. Using the Monte-Carlo approach to model photopion interactions in the central regions of AGN and then after taking into account the cosmological evolution it is shown that within the framework of this approach it is possible to describe both $\sim$ 100 TeV and sub PeV neutrinos from AGN taking into account only photohadronic interactions.

astro-ph.HE↗

arXiv2023

General constraints on sources of high-energy cosmic rays from the interaction losses

Sources of high-energy cosmic rays are presently unknown, but can be constrained in various ways. Some of these constraints can be graphically presented on the so-called Hillas diagram. Previous versions of this diagram determined the range of geometrical sizes and magnetic fields of potential astrophysical accelerators, taking into account geometrical criteria and radiation losses. In this work, we update the Hillas diagram for protons, taking into account the losses associated with the $pγ$ and photopair interactions, relating the allowed regions to the source electromagnetic luminosity. The strongest constraints are obtained for bright compact sources such as the central regions of active galactic nuclei.

astro-ph.HE↗