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Caltech-NRAO Stripe...
Caltech-NRAO Stripe 82 Survey (CNSS). III. The First Radio-discovered Tidal Disruption Event, CNSS J0019+00
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- Anderson, M. M. (författare)
- California Institute of Technology (Caltech)
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- Mooley, K. P. (författare)
- California Institute of Technology (Caltech),National Radio Astronomy Observatory
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- Hallinan, G. (författare)
- California Institute of Technology (Caltech)
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- Dong, D. (författare)
- California Institute of Technology (Caltech)
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- Phinney, E. S. (författare)
- California Institute of Technology (Caltech)
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- Horesh, A. (författare)
- The Hebrew University Of Jerusalem
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- Bourke, Stephen, 1978 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Cenko, S. B. (författare)
- NASA Goddard Space Flight Center,University of Maryland
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- Frail, D. (författare)
- National Radio Astronomy Observatory
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- Kulkarni, S. R. (författare)
- California Institute of Technology (Caltech)
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- Myers, S. (författare)
- National Radio Astronomy Observatory
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(creator_code:org_t)
- 2020-11-09
- 2020
- Engelska.
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Ingår i: Astrophysical Journal. - : American Astronomical Society. - 1538-4357 .- 0004-637X. ; 903:2
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https://research.cha...
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https://doi.org/10.3...
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Abstract
Ämnesord
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- 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 less than or similar to 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 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 similar to 15,000 km s(-1) outflow, having energy similar to 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 Jy) 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
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Anderson, M. M.
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Mooley, K. P.
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Hallinan, G.
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Dong, D.
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Phinney, E. S.
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Horesh, A.
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visa fler...
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Bourke, Stephen, ...
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Cenko, S. B.
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Frail, D.
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Kulkarni, S. R.
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Myers, S.
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