1. VLBI Scrutiny of a New Neutrino-Blazar Multiwavelength-Flare Coincidence.
- Author
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Eppel, F., Kadler, M., Ros, E., Rösch, F., Heßdörfer, J., Benke, P., Edwards, P. G., Fromm, C. M., Giroletti, M., Gokus, A., Gómez, J. L., Hämmerich, S., Kirchner, D., Kovalev, Y. Y., Krichbaum, T. P., Lister, M. L., Nanci, C., Ojha, R., Paraschos, G. F., and Plavin, A.
- Subjects
BL Lacertae objects ,NEUTRINO astrophysics ,WAVELENGTHS ,OPTICAL polarization ,ASTRONOMICAL observations - Abstract
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. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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