Apparent superluminal core expansion and limb brightening in the candidate neutrino blazar TXS 0506+056

Understand

IceCube has reported a very-high-energy neutrino (IceCube-170922A) in a region containing the blazar TXS 0506+056.

• Correlated {\gamma}-ray activity has led to the first high-probability association of a high-energy neutrino with an extragalactic source.
• This blazar has been found to be in a radio outburst during the neutrino event.
• We have performed target-of-opportunity VLBI imaging observations at 43 GHz frequency with the VLBA two and eight months, respectively, after the neutrino event.