Radio Flaring of the Quasar B2 1420+32

ATel #14822; F. Eppel, M. Kadler, A. Gokus, J. Heßdörfer, F. Rösch, J. Sinapius
on 1 Aug 2021; 12:25 UT
Credential Certification: Matthias Kadler (matthias.kadler@astro.uni-wuerzburg.de)

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We report radio flaring of the flat-spectrum radio quasar B2 1420+32 at high radio frequencies in the 14mm and 7mm bands observed as part of the TELAMON program. We have observed the source in the night of July 28, 2021 and measured flux densities of (1.059 ± 0.012) Jy and (1.26 ± 0.10) Jy at 14mm and 7mm, respectively, averaged over four frequencies within each band. This corresponds to an increase of ~300mJy at 14mm and ~500 mJy at 7mm within 33 days. The radio flaring seems to correlate with an ongoing optical flare of this source reported in ATel #14819.

The TELAMON program uses the Effelsberg 100-m telescope to monitor the radio spectra of very-high-energy emitting active galactic nuclei (AGN), namely TeV blazars and candidate neutrino-associated AGN, with high-cadence high-frequency observations every ~3 weeks and at multiple frequencies up to 44 GHz.

We encourage more observations especially at other wavelengths to further characterize the correlated optical and radio flaring event in this TeV-detected (Atel #13412) blazar.