SUB-GEV GAMMA RAYS FROM NEARBY SEYFERT GALAXIES AND IMPLICATIONS FOR CORONAL NEUTRINO EMISSION

作     者：Murase, Kohta Karwin, Christopher M. Kimura, Shigeo S. Ajello, Marco Buson, Sara 

作者机构：Department of Physics Department of Astronomy & Astrophysics Center for Multimessenger Astrophysics Institute for Gravitation and the Cosmos The Pennsylvania State University University ParkPA16802 United States School of Natural Sciences Institute for Advanced Study PrincetonNJ08540 United States Center for Gravitational Physics and Quantum Information Yukawa Institute for Theoretical Physics Kyoto University Kyoto606-8502 Japan NASA Postdoctoral Program Fellow NASA Goddard Space Flight Center GreenbeltMD20771 United States Frontier Research Institute for Interdisciplinary Sciences Astronomical Institute Graduate School of Science Tohoku University Miyagi980-8578 Japan Department of Physics and Astronomy Clemson University ClemsonSC29634 United States Fakultät für Physik und Astronomie Julius-Maximilians-Universität Würzburg WürzburgD-97074 Germany 

出 版 物：《arXiv》 (arXiv)

年 卷 期：2023年

核心收录：

主　　题：Gamma rays 

摘      要：Recent observations of high-energy neutrinos by IceCube and gamma rays by the Fermi Large Area Telescope (LAT) and the MAGIC telescope have suggested that neutrinos are produced in gamma-ray opaque environments in the vicinity of supermassive black holes. In this work, we present 20 MeV – 1 TeV spectra of three Seyfert galaxies whose nuclei are predicted to be active in neutrinos, NGC 4151, NGC 4945 and the Circinus galaxy, using 14.4 yr of the Fermi LAT data. In particular, we find evidence of sub-GeV excess emission that can be attributed to gamma rays from NGC 4945, as was also seen in NGC 1068. These spectral features are consistent with predictions of the magnetically powered corona model, and we argue that NGC 4945 is among the brightest neutrino active galaxies detectable for KM3Net and Baikal-GVD. On the other hand, in contrast to other reported results, we do not detect gamma rays from NGC 4151, which constrains neutrino emission from the accretion shock model. Future neutrino detectors such as IceCube-Gen2 and MeV gamma-ray telescopes such as AMEGO-X will be crucial for discriminating among the theoretical models. © 2023, CC BY.