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

Authors :
Eppel, F.
Kadler, M.
Ros, E.
Roesch, F.
Hessdoerfer, J.
Benke, P.
Edwards, P. G.
Fromm, C. M.
Giroletti, M.
Gokus, A.
Gomez, J. L.
Haemmerich, S.
Kirchner, D.
Kovalev, Y. Y.
Krichbaum, T. P.
Lister, M. L.
Nanci, C.
Ojha, R.
Paraschos, G. F.
Plavin, A.
Readhead, A. C. S.
Stevens, J.
Weber, P.
Publication Year :
2023

Abstract

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.<br />Comment: 4 pages, 2 figures, IAU Symposium 375: The Multimessenger Chakra of Blazar Jets

Details

Language :
English
Database :
OpenAIRE
Accession number :
edsair.doi.dedup.....66d65ac9f359d0a9eb487045a2264a51