A possible radio detection of the TDE candidate AT2019DSG by AMI-LA
ATel #12798; Itai Sfaradi (HUJI), David Williams (Oxford), Assaf Horesh (HUJI), Joe Bright, Rob Fender (Oxford), David Titterington, Dave Green (MRAO, Cambridge), Yvette Perrott (Victoria University of Wellington)
on 23 May 2019; 13:25 UT
Credential Certification: Assaf Horesh (assafh@mail.huji.ac.il)
Subjects: Radio, Transient, Tidal Disruption Event
We observed the field of the TDE candidate AT2019DSG (ATEL #12752, TNS Report #33340) with the Arcminute Microkelvin Imager Large Array (AMI-LA; Zwart et al. 2008; Hickish et al. 2018) at 15.5 GHz. The custom pipeline REDUCE_DC (e.g. Perrott et al. 2015) was used to calibrate and flag the data, with 3C286 as the absolute flux calibrator and J2051+1743 as the interleaved phase calibrator.
We detect an unresolved source at the phase center and fitted it with the CASA task IMFIT. On 2019 May 16.24 the peak flux was ~0.5 mJy/beam (> 5-sigma detection) at RA: 20:57:02.4 +/- 3.41", Dec: +14:12:09.68 +/- 5.6".
The archival non-detection of this source in the NVSS survey suggests that the radio emission we detect is possibly originating from the TDE candidate AT2019DSG (assuming a spectral index of -0.7 or steeper).
We plan to continue monitoring this source and would like to thank the MRAO staff for carrying out these observations.
