Speaker
Description
Recent studies indicate the connection between the detection of high-energy neutrinos from blazars and beaming of their relativistic jets, suggesting that the jets are the sites of the neutrino production. Detailed studies of the jet structure and dynamics, made possible by means of very-long-baseline radio interferometry (VLBI), shed light on the localization of the neutrino-emitting zone and on the mechanism of acceleration and interactions of relativistic protons. Observational evidence for spine–sheath jet stratification, in particular, may resolve the long-standing discrepancy between the high Doppler factors required by neutrino models and the slow speeds measured from VLBI component tracking. We present the results of new multi-epoch VLBI observations of prominent neutrino-candidate blazars and discuss their theoretical implications.