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000461908 245__ $$aA concordance scenario for the observed neutrino from a tidal disruption event
000461908 260__ $$aLondon$$bNature Publishing Group$$c2021
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000461908 520__ $$aDuring a tidal disruption event, a star is torn apart by the tidal forces of a supermassive black hole, with about 50% of the star’s mass eventually accreted by the black hole. The resulting flare can, in extreme cases of super-Eddington mass accretion, result in a relativistic jet1,2,3,4. While tidal disruption events have been theoretically proposed as sources of high-energy cosmic rays5,6 and neutrinos7,8,9,10,11,12,13,14, stacking searches indicate that their contribution to the diffuse extragalactic neutrino flux is very low15. However, a recent association of a track-like astrophysical neutrino (IceCube-191001A16) with a tidal disruption event (AT2019dsg17) indicates that some tidal disruption events can accelerate cosmic rays to petaelectronvolt energies. Here we introduce a phenomenological concordance scenario with a relativistic jet to explain this association: an expanding cocoon progressively obscures the X-rays emitted by the accretion disk, while at the same time providing a sufficiently intense external target of backscattered X-rays for the production of neutrinos via proton–photon interactions. We also reproduce the delay (relative to the peak) of the neutrino emission by scaling the production radius with the black-body radius. Our energetics and assumptions for the jet and the cocoon are compatible with expectations from numerical simulations of tidal disruption events.
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000461908 650_7 $$2INSPIRE$$aneutrino: production
000461908 650_7 $$2INSPIRE$$aX-ray: emission
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000461908 7001_ $$0P:(DE-H253)PIP1028564$$aLunardini, Cecilia$$b1
000461908 773__ $$0PERI:(DE-600)2879712-7$$a10.1038/s41550-021-01305-3$$gVol. 5, no. 5, p. 621 - 621$$p472 - 477$$tNature astronomy$$v5$$x2397-3366$$y2021
000461908 7870_ $$0PUBDB-2020-03342$$aWinter, Walter et.al.$$d2020$$iIsParent$$rarXiv:2005.06097 ; DESY-20-088$$tA concordance scenario for the observation of a neutrino from the Tidal Disruption Event AT2019dsg
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