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

Published online by Cambridge University Press:  11 September 2023

F. Eppel Open the ORCID record for F. Eppel [Opens in a new window] ,
M. Kadler ,
E. Ros ,
F. Rösch ,
J. Heßdörfer ,
P. Benke ,
P. G. Edwards ,
C. M. Fromm ,
M. Giroletti  and
A. Gokus
...Show all authors
F. Eppel
Affiliation:
Julius-Maximilians-Universität Würzburg, Physikalisches Institut, Lehrstuhl für Astronomie, Emil-Fischer-Straße 31, 97074 Würzburg, Germany
M. Kadler
Affiliation:
Julius-Maximilians-Universität Würzburg, Physikalisches Institut, Lehrstuhl für Astronomie, Emil-Fischer-Straße 31, 97074 Würzburg, Germany
E. Ros
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
F. Rösch
Affiliation:
Julius-Maximilians-Universität Würzburg, Physikalisches Institut, Lehrstuhl für Astronomie, Emil-Fischer-Straße 31, 97074 Würzburg, Germany
J. Heßdörfer
Affiliation:
Julius-Maximilians-Universität Würzburg, Physikalisches Institut, Lehrstuhl für Astronomie, Emil-Fischer-Straße 31, 97074 Würzburg, Germany
P. Benke
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
P. G. Edwards
Affiliation:
CSIRO Astronomy and Space Science, ATNF, PO Box 76. Epping NSW 1710. Australia
C. M. Fromm
Affiliation:
Julius-Maximilians-Universität Würzburg, Physikalisches Institut, Lehrstuhl für Astronomie, Emil-Fischer-Straße 31, 97074 Würzburg, Germany
M. Giroletti
Affiliation:
INAF, Istituto di Radio Astronomia, Via Piero Gobetti, 41029 Bologna, Italy
A. Gokus
Affiliation:
McDonnell Center for Space Science, Washington University, MSC 1105-109-03, One Brookings Drive, St. Louis, MO 63130-4899, USA
J. L. Gómez
Affiliation:
Instituto de Astrofsica de Andaluca, Gta. de la Astronomia, 18008 Granada, Spain
S. Hämmerich
Affiliation:
Remeis Observatory and Erlangen Centre for Astroparticle Physics, Universität Erlangen-Nürnberg, Sternwartstr. 7, 96049 Bamberg, Germany
D. Kirchner
Affiliation:
Julius-Maximilians-Universität Würzburg, Physikalisches Institut, Lehrstuhl für Astronomie, Emil-Fischer-Straße 31, 97074 Würzburg, Germany
Y. Y. Kovalev
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany Lebedev Physical Institute, Leninskii pr. 53, 119991, Moscow, Russia
T. P. Krichbaum
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
M. L. Lister
Affiliation:
Department of Physics and Astronomy, Purdue University, 525 Northwestern Avenue, West Lafayette, IN 47907, USA
C. Nanci
Affiliation:
INAF, Istituto di Radio Astronomia, Via Piero Gobetti, 41029 Bologna, Italy
R. Ojha
Affiliation:
NASA, Goddard Space Flight Center, Astrophysics Science Division, Code 661, Greenbelt, MD 20071, USA
G. F. Paraschos
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
A. Plavin
Affiliation:
Lebedev Physical Institute, Leninskii pr. 53, 119991, Moscow, Russia
A. C. S. Readhead
Affiliation:
California Institute of Technology, 1200 E California Blvd, Pasadena, CA 91125, USA
J. Stevens
Affiliation:
CSIRO Astronomy and Space Science, ATNF, PO Box 76. Epping NSW 1710. Australia
P. Weber
Affiliation:
Julius-Maximilians-Universität Würzburg, Physikalisches Institut, Lehrstuhl für Astronomie, Emil-Fischer-Straße 31, 97074 Würzburg, Germany
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Abstract

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In recent years, evidence has started piling up that some high-energy cosmic neutrinos can be associated with blazars in flaring states. On 2022 February 26, a new blazar-neutrino coincidence was 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 γ-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.

Keywords

AGNBlazarNeutrinoMultimessengerVLBI
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 17 , Symposium S375: The Multimessenger Chakra of Blazar Jets , December 2021 , pp. 91 - 95
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This is an Open Access article, distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike licence (https://creativecommons.org/licenses/by-nc-sa/4.0/), which permits noncommercial re-use, distribution, and reproduction in any medium, provided the same Creative Commons licence is included and the original work is properly cited. The written permission of Cambridge University Press must be obtained for commercial re-use.
Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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