A combined astrophysical and dark matter interpretation of the IceCube HESE and throughgoing muon events

作者：Sui Yicong^*; Dev P S Bhupal

来源：Journal of Cosmology and Astroparticle Physics, 2018, 2018(7): 020.

DOI：10.1088/1475-7516/2018/07/020

• cosmological neutrinos
• ultra high energy photons and neutrinos
• dark matter simulations
• ultra high energy cosmic rays

We perform a combined likelihood analysis for the IceCube 6-year high-energy starting events (HESE) above 60 TeV and 8-year throughgoing muon events above 10 TeV using a two-component neutrino flux model. The two-component flux can be motivated either from purely astrophysical sources or due to a beyond Standard Model contribution, such as decaying heavy dark matter. As for the astrophysical neutrinos, we consider two different source flavor compositions corresponding to the standard pion decay and muon-damped pion decay sources. We find that the latter is slightly preferred over the former as the high-energy component, while the low-energy component does not show any such preference. We also take into account the multi-messenger gamma-ray constraints and find that our two-component fit is compatible with these constraints, whereas the single-component power-law best fit to the HESE data is ruled out. The astrophysical plus dark matter interpretation of the two-component flux is found to be mildly preferred by the current data and the gamma-ray constraints over the purely astrophysical explanation.

• 出版日期2018-7