VLBI Scrutiny of a New Neutrino-Blazar Multiwavelength-Flare Coincidence. (arXiv:2301.13859v1 [astro-ph.HE])

VLBI Scrutiny of a New Neutrino-Blazar Multiwavelength-Flare Coincidence. (arXiv:2301.13859v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Eppel_F/0/1/0/all/0/1">F. Eppel</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kadler_M/0/1/0/all/0/1">M. Kadler</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ros_E/0/1/0/all/0/1">E. Ros</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Roesch_F/0/1/0/all/0/1">F. Roesch</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hessdoerfer_J/0/1/0/all/0/1">J. Hessdoerfer</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Benke_P/0/1/0/all/0/1">P. Benke</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Edwards_P/0/1/0/all/0/1">P. G. Edwards</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Fromm_C/0/1/0/all/0/1">C. M. Fromm</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Giroletti_M/0/1/0/all/0/1">M. Giroletti</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gomez_J/0/1/0/all/0/1">J. L. Gomez</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kovalev_Y/0/1/0/all/0/1">Y. Y. Kovalev</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Krichbaum_T/0/1/0/all/0/1">T. P. Krichbaum</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lister_M/0/1/0/all/0/1">M. L. Lister</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Nanci_C/0/1/0/all/0/1">C. Nanci</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ojha_R/0/1/0/all/0/1">R. Ojha</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Paraschos_G/0/1/0/all/0/1">G. F. Paraschos</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Plavin_A/0/1/0/all/0/1">A. Plavin</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Readhead_A/0/1/0/all/0/1">A. C. S. Readhead</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Stevens_J/0/1/0/all/0/1">J. Stevens</a>

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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