Astrophys. J., 903, 116-116 (2020/November-2)
Caltech-NRAO Stripe 82 Survey (CNSS). III. The first radio-discovered tidal disruption event, CNSS J0019+00.
ANDERSON M.M., MOOLEY K.P., HALLINAN G., DONG D., PHINNEY E.S., HORESH A., BOURKE S., CENKO S.B., FRAIL D., KULKARNI S.R. and MYERS S.
Abstract (from CDS):
We present the discovery of a nuclear transient with the Caltech-NRAO Stripe 82 Survey (CNSS), a dedicated radio transient survey carried out with the Karl G. Jansky Very Large Array (VLA). This transient, CNSS J001947.3+003527, exhibited a turn-on over a timescale of <=1 yr, increasing in flux density at 3 GHz from <0.14 mJy in 2014 February to 4.4 ± 0.1 mJy in 2015 March, reaching a peak luminosity of 5×1028ergs–1Hz–1 around 2015 October. The association of CNSS J0019+00 with the nucleus (Gaia and our very-long baseline interferometry positions are consistent to within 1 pc) of a nearby S0 Seyfert galaxy at 77 Mpc, together with the radio spectral evolution, implies that this transient is most likely a tidal disruption event (TDE). Our equipartition analysis indicates the presence of a ∼15,000 km s–1 outflow, having energy ∼1049 erg. We derive the radial density profile for the circumnuclear material in the host galaxy to be proportional to R–2.5. All of these properties suggest resemblance with radio-detected thermal TDEs like ASASSN-14li and XMMSL1 J0740-85. No significant X-ray or optical emission is detected from CNSS J0019+00, although this may simply be due to the thermal emission being weak during our late-time follow-up observations. From the CNSS survey we have obtained the first unbiased measurement of the rate of radio TDEs, R(>500µJy) of about 2 x 10–3 deg–2, or equivalently a volumetric rate of about 10 Gpc–3 yr–1. This rate implies that all-sky radio surveys such as the VLA Sky Survey and those planned with ASKAP, will find many tens of radio TDEs over the next few years.
© 2020. The American Astronomical Society. All rights reserved.
Tidal disruption - Radio transient sources - Radio interferometry
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