A ring accelerator? Unusual jet dynamics in the IceCube candidate PKS 1502+106

Understand

On 2019/07/30.86853 UT, IceCube detected a high-energy astrophysical neutrino candidate.

• The Flat Spectrum Radio Quasar PKS 1502+106 is located within the 50 percent uncertainty region of the event.
• Our analysis of 15 GHz Very Long Baseline Array (VLBA) and astrometric 8 GHz VLBA data, in a time span prior and after the IceCube event, reveals evidence for a radio ring structure which develops with time.
• Several arc-structures evolve perpendicular to the jet ridge line.