Kavli Affiliate: Zhuo Li
| First 5 Authors: Han-Ji Wu, Guo-Bin Mou, Kai Wang, Wei Wang, Zhuo Li
| Summary:
The origin of ultra-high energy neutrinos still lacks observational evidence,
besides, the physical mechanism is also unclear. There is an association of a
PeV neutrino event (IceCube-191001A) with an optical tidal disruption event
(TDE, AT2019dsg) which was detected 6 months ahead from IceCube-191001A. The
numerical simulations and observations suggested that a TDE can produce
ultrafast outflows, which will interact with clouds near the supermassive black
hole. In this paper, we study the interactions between TDE outflows and clouds
and the possible production. In the shock waves generated by the outflow-cloud
interactions, protons can be accelerated to $sim$ 60 PeV with the outflow
velocity 0.07 c and kinetic luminosity $10^{45}rm erg/s$. PeV neutrinos can be
produced through hadronic reactions. The calculation illustrates that the
expected PeV neutrino event from AT2019dsg is 0.014 for a power-law proton
energy distribution of $Gamma=1.5$ and 0.0016 for $Gamma=1.9$. The GeV –TeV
$gamma$-rays through hadronic processes are lower than the present observed
limits. Outflows escaped from the TDE center colliding with clouds, which also
can naturally explain the half-year delay between the neutrino event and TDE.
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