The RATAN-600 2-22 GHz continuum spectrum of the neutrino association quasar TXS 1100+122 is slightly rising
ATel #13405; Yu. A. Kovalev (ASC Lebedev), Yu. V. Sotnikova (SAO RAS), A. K. Erkenov (SAO RAS), Y. Y. Kovalev (ASC Lebedev, MIPT, MPIfR), A. V. Plavin (ASC Lebedev, MIPT), S. V. Troitsky (INR)
on 15 Jan 2020; 16:31 UT
Credential Certification: Yuri Y. Kovalev (yyk@asc.rssi.ru)
Subjects: Radio, Neutrinos, Quasar
In ATel 13397 we argued that the quasar TXS 1100+122 is a highly probable neutrino association for the IceCube-200109A event due to its compact and bright core at parsec scales (8 GHz VLBI image) following conclusions by Plavin et al. (arXiv:2001.00930). Since that time we have organized RATAN-600 measurements of its total continuum radio spectrum. The observations were performed on 11-14 January 2020 and resulted in the following average values: 2.3 GHz: 262+-39 mJy, 5 GHz: 392+-20 mJy, 8 GHz: 445+-22 mJy, 11 GHz: 452+-23 mJy, 22 GHz: 552+-39 mJy. The values are comparable or higher than historic ones from literature (0.2-0.3 Jy), our RATAN measurements in 2002 and 2003 (0.3-0.4 Jy) and VLBA 8 GHz measurements in 2004 and 2012 (0.15-0.3 Jy). We note that the spectrum is slightly inverted towards the highest frequency of 22 GHz which has risen the most. Such behaviour is typical when a synchrotron flare starts in an AGN core - as expected for a neutrino association (Plavin et al.). However, this should be checked by further observations. We will continue monitoring this quasar at RATAN.
