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arxiv 2301.13859 v3 pith:HW6TQJIJ submitted 2023-01-31 astro-ph.HE

VLBI Scrutiny of a New Neutrino-Blazar Multiwavelength-Flare Coincidence

classification astro-ph.HE
keywords neutrinosourceblazarscoincidenceeventphysicalradioarray
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In the past years, evidence has started piling up that some high-energy cosmic neutrinos can be associated with blazars in flaring states. On February 26, 2022, a new blazar-neutrino coincidence has been reported: the track-like neutrino event IC220225A detected by IceCube is spatially coincident with the flat-spectrum radio quasar PKS 0215+015. Like previous associations, this source was found to be in a high optical and ${\gamma}$-ray state. Moreover, the source showed a bright radio outburst, which substantially increases the probability of a true physical association. We have performed six observations with the VLBA shortly after the neutrino event with a monthly cadence and are monitoring the source with the Effelsberg 100m-Telescope, and with the Australia Compact Telescope Array. Here, we present first results on the contemporary parsec-scale jet structure of PKS 0215+015 in total intensity and polarization to constrain possible physical processes leading to neutrino emission in blazars.

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