VLBI radio structure and radio brightening of the high-energy neutrino emitting blazar TXS 0506+056

Understand

We report on the radio brightening of the blazar TXS 0506+056 (at $z=0.3365$), supporting its identification as source of the high-energy (HE) neutrino IC-170922A by the IceCube Neutrino Observatory.

• MOJAVE/VLBA data indicate its radio brightness abruptly increasing since January 2016.
• When decomposing the total radio flux density curve (January 2008 - July 2018) provided by the Owens Valley Radio Observatory into eight Gaussian flares, the peak time of the largest flare overlaps with the HE neutrino detection, while the total flux density exhibits a threefold increase since January 2016.
• We reveal the radio structure of TXS 0506+056 by analysing VLBI data from the MOJAVE/VLBA Survey.