http://arxiv.org/abs/2005.08937
Tidal disruption events (TDE) have been considered as cosmic-ray and neutrino sources for a decade. We suggest two classes of new scenarios for high-energy multi-messenger emission from TDEs that do not have to harbor powerful jets. First, we investigate high-energy neutrino and gamma-ray production in the core region of a supermassive black hole. In particular, we show that $\sim10-100$~TeV neutrinos and MeV gamma-rays can efficiently be produced in hot coronae around an accretion disk. We also study the consequences of possible particle acceleration in radiatively inefficient accretion flows (RIAFs). Second, we consider possible cosmic-ray acceleration by disk-driven winds or interactions between tidal streams, and show that subsequent hadronuclear and photohadronic interactions inside the TDE debris lead to GeV-TeV neutrinos and sub-GeV cascade gamma-rays. We demonstrate that these models should be accompanied by hard X-rays and soft gamma-rays, which can be used for future observational tests. By considering the corona, RIAF, hidden wind, and hidden jet models, we discuss the implications of the observation of the high-energy neutrino IceCube-191001A in coincidence with the TDE AT2019dsg. It is not yet possible to be conclusive about their physical association, but we find that the most optimistic cases of the corona and hidden disk-wind models can be consistent with the observation of IceCube-191001A with a few percent chance probability, whereas jet models are unlikely to explain the multi-messenger observations.
K. Murase, S. Kimura, B. Zhang, et. al.
Tue, 19 May 20
75/92
Comments: 14 pages, 5 figures
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