Rising radio emission from TDE AT2019qiz
ATel #13334; Andrew O'Brien (University of Wisconsin-Milwaukee), David Kaplan (University of Wisconsin-Milwaukee), Tara Murphy (University of Sydney), Wenfei Yu (Shanghai Astronomical Observatory), Wenda Zhang (Astronomical Institute, Czech Academy of Sciences)
on 6 Dec 2019; 18:11 UT
Credential Certification: Andrew O'Brien (obrienan@uwm.edu)
Subjects: Radio, Transient, Tidal Disruption Event
AT2019qiz is a tidal disruption event discovered optically on 2019-09-19 and has been consistently monitored since with Swift (see ATel #13131, #13146, #13193, #13170).
Observations on 2019-10-25 and 2019-11-17 detected a likely radio counterpart, although the lack of spectral coverage prevented firm conclusions (ATel #13310). We have conducted another epoch of radio observations with the Australia Telescope Compact Array (ATCA) under the project code CX442 with broader frequency coverage to confirm variability.
Our latest radio observation was conducted on 2019-12-02 and measures the SED of AT2019qiz from 2.1 - 21.2 GHz by frequency switching between the L/S, C/X and K band receivers. We detect AT2019qiz with high significance (> 25-sigma) in all bands except 2.1 GHz where there we find no detection. The emission is well fit by a point source model with the following peak fluxes: 0.71 +/- 0.04 mJy at 5.5 GHz, 1.69 +/- 0.03 mJy at 9.0 GHz, 2.38 +/- 0.04 mJy at 16.7 GHz, and 2.61 +/- 0.05 mJy at 21.2 GHz. These latest flux densities confirm that the radio emission from AT2019qiz is on the rise. The position remains consistent with the optical detection with positional accuracies <0.1". Additional epochs with the ATCA are planned.
We thank the staff at the Australia Telescope National Facility for approving our observation requests. AO and DK were supported by NSF grant AST-1816492.
