Title: Upper Limit on the Coronal Cosmic Ray Energy Budget in Seyfert Galaxies.
Authors: Yoshiyuki Inoue, Shinsuke Takasao, Dmitry Khangulyan
The IceCube collaboration has reported possible detections of high-energy neutrinos from nearby Seyfert galaxies. While central hot coronae are proposed as the primary neutrino production site, the exact coronal cosmic-ray energy budget has been loosely constrained. In this study, we propose a new stringent upper bound on the coronal cosmic-ray energy budget of Seyfert galaxies, considering both accretion dynamics and observed properties of radio-quiet Seyfert galaxies. Notably, even under the calorimetric condition where cosmic rays lose all their energies, our limit indicates that the coronal neutrino flux of NGC~1068 is about an order of magnitude fainter than the observed levels. This discrepancy suggests the need for further theoretical and observational investigations on the IceCube signals from Seyfert galaxies.
も参照してください
- Our paper on cosmic rays in cosmological filaments is accepted by Universe.
- Our paper on multi-epoch X-ray spectral analysis of Cen A is accepted by PASJ.
- Our paper on radio emission from AGN disk winds is accepted by ApJ.
- Our paper on Millimeter Time Variability in the Gamma-Ray Detected Seyfert Galaxy GRS 1734-292 is accepted by ApJ.
- Our paper on gamma-ray emission in NGC 4151 is accepted by PASJ.