TY - JOUR
T1 - High-energy neutrinos and gamma rays from the AGN-driven wind in NGC 1068
AU - Inoue, Susumu
AU - Cerruti, Matteo
AU - Murase, Kohta
AU - Liu, Ruoyu
N1 - Publisher Copyright:
© Copyright owned by the author(s) under the terms of the Creative Commons.
PY - 2022/3/18
Y1 - 2022/3/18
N2 - Various observations are revealing the widespread occurrence of fast and powerful winds in active galactic nuclei (AGN) that are distinct from relativistic jets, likely launched from accretion disks. Such winds can harbor collisionless shocks at different locations that may induce acceleration of protons and electrons and consequent nonthermal emission. We focus on the inner regions of the winds, where interactions of accelerated protons with the AGN radiation field and/or ambient gas clouds can induce emission of high-energy neutrinos and gamma rays. In particular, we address the case of NGC 1068, a nearby Seyfert galaxy bearing a prominent wind, which is a known source of GeV gamma rays as well as a tentative source of sub-PeV neutrinos. Considering pγ, pp, as well as all relevant electromagnetic processes in such regions, we model the multi-messenger emission of NGC 1068. The relatively soft neutrino spectrum indicated by IceCube may favor a predominantly pp interpretation in which high-energy protons interact with gas that has densities typical of broad line region clouds. The accompanying cascade emission modulated by γγ absorption in the AGN radiation field can account for the observed GeV emission under certain conditions.
AB - Various observations are revealing the widespread occurrence of fast and powerful winds in active galactic nuclei (AGN) that are distinct from relativistic jets, likely launched from accretion disks. Such winds can harbor collisionless shocks at different locations that may induce acceleration of protons and electrons and consequent nonthermal emission. We focus on the inner regions of the winds, where interactions of accelerated protons with the AGN radiation field and/or ambient gas clouds can induce emission of high-energy neutrinos and gamma rays. In particular, we address the case of NGC 1068, a nearby Seyfert galaxy bearing a prominent wind, which is a known source of GeV gamma rays as well as a tentative source of sub-PeV neutrinos. Considering pγ, pp, as well as all relevant electromagnetic processes in such regions, we model the multi-messenger emission of NGC 1068. The relatively soft neutrino spectrum indicated by IceCube may favor a predominantly pp interpretation in which high-energy protons interact with gas that has densities typical of broad line region clouds. The accompanying cascade emission modulated by γγ absorption in the AGN radiation field can account for the observed GeV emission under certain conditions.
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M3 - Conference article
AN - SCOPUS:85123444288
SN - 1824-8039
VL - 395
JO - Proceedings of Science
JF - Proceedings of Science
M1 - 1013
T2 - 37th International Cosmic Ray Conference, ICRC 2021
Y2 - 12 July 2021 through 23 July 2021
ER -