PoS - Proceedings of Science
Volume 358 - 36th International Cosmic Ray Conference (ICRC2019) - NU - Neutrino
Constraining the environment of neutrino-emitting regions in jets of FSRQs
A. Reimer*, M. Böttcher, S. Buson, D. Miceli  on behalf of the Fermi-LAT Collaboration
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Pre-published on: July 22, 2019
Published on: July 02, 2021
Recently, the gamma-ray blazar TXS 0506+056 has been proposed as the source of neutrino events detected by IceCube in 2014-15 and 2017. This has further pushed the idea of blazar jets being among those cosmic sites where significant neutrino production may take place.

We use a procedure based on source-internal electromagnetic cascading to constrain the environments of neutrino-producing sites in photomeson production models of jetted AGN. The role of external photon fields as the dominant target for particle-photon interactions including possible effects of the anisotropic nature of the interactions in the co-moving jet frame is discussed.

We apply this procedure to the 2014-15 neutrino spectrum observed by IceCube from TXS 0506+056 to conduct a comprehensive study of these cascade spectra. By comparing these to the simultaneous multi wavelength emission of this blazar constraints on the environment of the neutrino-emitting region are derived.
DOI: https://doi.org/10.22323/1.358.0988
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