A concordance scenario for the observed neutrino from a tidal disruption event

摘要: During a tidal disruption event, star is torn apart by the forces of supermassive black hole, with about 50% star’s mass eventually accreted hole. The resulting flare can, in extreme cases super-Eddington accretion, result relativistic jet1–4. While events have been theoretically proposed as sources high-energy cosmic rays5,6 and neutrinos7–14, stacking searches indicate that their contribution to diffuse extragalactic neutrino flux very low15. However, recent association track-like astrophysical (IceCube-191001A16) event (AT2019dsg17) indicates some can accelerate rays petaelectronvolt energies. Here we introduce phenomenological concordance scenario jet explain this association: an expanding cocoon progressively obscures X-rays emitted accretion disk, while at same time providing sufficiently intense external target backscattered for production neutrinos via proton–photon interactions. We also reproduce delay (relative peak) emission scaling radius black-body radius. Our energetics assumptions are compatible expectations from numerical simulations events. A be explained