Flat spectrum radio quasar TXS 1100+122 has a bright VLBI-compact core - as expected for neutrino candidate sources

ATel #13397; Y. Y. Kovalev (ASC Lebedev, MIPT, MPIfR), S. V. Troitsky (INR), Yu. A. Kovalev (ASC Lebedev), A. V. Plavin (ASC Lebedev, MIPT)
on 10 Jan 2020; 10:45 UT
Credential Certification: Yuri Y. Kovalev (yyk@asc.rssi.ru)

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We have recently shown that VLBI-selected radio-bright AGN are highly probable neutrino associations (Plavin et al., arXiv:2001.00930) with neutrino being generated within their central parsec-scale region. Today, IceCube collaboration has detected a new neutrino event which passed the selection criteria used in our analysis. The closest radio-bright AGN within the error region to the IceCube-200109A neutrino candidate is found to be the quasar TXS 1100+122 at z=0.914 which is also discussed in the original GCN circular 26696. Its archival observations in 2004 within the VLBA calibrator survey at 8 GHz show a very compact core-dominated structure with the core size estimated to be 0.3 mas or 2 pc and flux density about 0.3 Jy. On the basis of available VLBI catalogs this source seems to be the brightest within the IceCube error region which makes it a highly probable neutrino association. Radio follow up including VLBI observations is strongly encouraged.

8 GHz VLBA map of TXS 1100+122