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Volume 358 - 36th International Cosmic Ray Conference (ICRC2019) - NU - Neutrino
Constraining the environment of neutrino-emitting regions in jets of FSRQs
A. Reimer,* M. Boettcher, S. Buson, D. Miceli
*corresponding author
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Pre-published on: 2019 July 22
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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.
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