Speaker
Description
The tentative identification of the gamma-ray bright BL Lac object
TXS 0506+05 with very-high-energy neutrinos detected by IceCube
triggered a large number of works on the physics implications of
neutrino production in blazar jets. Most of these works agree that
GeV - TeV gamma-rays are unlikely to be produced by the same hadronic
processes generating the IceCube neutrinos in the same emission region.
In previous work, we had developed a method to derive general constraints
on the physical conditions in the neutrino emission region and multi-wavelength
electromagnetic signatures expected to go in tandem with such neutrino
production. Our main conclusion is that, in order to produce IceCube
neutrinos at the level of the 2014-15 neutrino flare from the direction
of TXS 0506+056 (accompanied only by a slightly harder Fermi-LAT spectrum,
but no flux enhancement), an intense UV - soft X-ray radiation field external
to the jet is required as target photon field for photo-pion interactions.
This result necessitates the proper treatment of anisotropies of the
target photon field in the frame of the emission region. In this talk,
we will briefly summarize previous work and present first results of
our study of the effects of anisotropies on the resulting neutrino
yield and electromagnetic signatures.
