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Caltech-NRAO Stripe 82 Survey (CNSS) Paper III: The First Radio-Discovered Tidal Disruption Event, CNSS J0019+00

Anderson, M. M. and Mooley, K. P. and Hallinan, G. and Dong, D. and Phinney, E. S. and Horesh, A. and Bourke, S. and Cenko, S. B. and Frail, D. and Kulkarni, S. R. and Myers, S. (2019) Caltech-NRAO Stripe 82 Survey (CNSS) Paper III: The First Radio-Discovered Tidal Disruption Event, CNSS J0019+00. . (Unpublished) https://resolver.caltech.edu/CaltechAUTHORS:20191119-103851999

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Abstract

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 February 2014 to 4.4±0.1 mJy in March 2015, reaching a peak luminosity of 5×10²⁸erg s⁻¹Hz⁻¹ around October 2015. The association of CNSS J0019+00 with the nucleus (Gaia and our VLBI 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 circum-nuclear 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 2×10⁻³deg⁻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.


Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription
http://arxiv.org/abs/1910.11912arXivDiscussion Paper
ORCID:
AuthorORCID
Anderson, M. M.0000-0003-2238-2698
Mooley, K. P.0000-0002-2557-5180
Hallinan, G.0000-0002-7083-4049
Dong, D.0000-0001-9584-2531
Horesh, A.0000-0002-5936-1156
Cenko, S. B.0000-0003-1673-970X
Kulkarni, S. R.0000-0001-5390-8563
Additional Information:The authors thank Ehud Nakar for insightful discussion on equipartition analysis and Vikram Ravi for helpful comments on improving this paper. The authors also thank Yi Cao for the optical data reduction analysis and Mansi Kasliwal for the use of CLU in the identification of transient events in CNSS. KPM is a Jansky Fellow of the National Radio Astronomy Observatory. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
Group:TAPIR, Astronomy Department
Funders:
Funding AgencyGrant Number
Jansky FellowshipUNSPECIFIED
National Radio Astronomy ObservatoryUNSPECIFIED
Subject Keywords:accretion, accretion disks, galaxies: nuclei, radiation mechanisms: non-thermal, techniques: interferometric
Record Number:CaltechAUTHORS:20191119-103851999
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20191119-103851999
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:99930
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:19 Nov 2019 19:01
Last Modified:02 Dec 2019 19:15

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