Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Caltech-NRAO Stripe 82 Survey (CNSS). III: The First Radio-discovered
  Tidal Disruption Event, CNSS J0019+00   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 $\lesssim$1 yr, increasing in flux
density at 3 GHz from $<0.14$ mJy in 2014 February to $4.4\pm0.1$ mJy in 2015
March, reaching a peak luminosity of $5\times10^{28} \text{erg s}^{-1}
\text{Hz}^{-1}$ around 2015 October. 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 $\sim$15,000 km s$^{-1}$
outflow, having energy $\sim$10$^{49}$ 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, $R(>500 \mu{\rm Jy})$ of about
$2\times10^{-3}$ 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.

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The categories of this paper are: eess
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: chem-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: stat
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The categories of this paper are: q-bio
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-alg
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The categories of this paper are: quant-ph
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The categories of this paper are: math-ph
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The categories of this paper are: physics
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The categories of this paper are: hep-ph
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The categories of this paper are: adap-org
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The categories of this paper are: nlin