Directional correlations between UHECRs and neutrinos observed with IceCube
arXiv:1011.1093 · doi:10.5194/astra-7-201-2011
Abstract
Ultra-high energy cosmic rays (UHECR) above an energy threshold of tens of EeV might undergo only small deflections due to interstellar magnetic fields. Their arrival directions would then point to regions of possible hadronic acceleration processes, which are likely to be also sources of high energy neutrinos. To search for such cosmic accelerators, we present here the first high statistics analysis of directional correlations between neutrino candidates from the IceCube Observatory and UHECR events. Data taken with IceCube in a configuration of 22 strings provided the basis for using published events from both the Pierre Auger Observatory and the HiRes experiment as reference directions in a search for coincidences with neutrinos. The analysis was optimized according to strict blindness criteria and showed an excess of neutrino candidates close to UHECR directions with a probability of 1% to occur as a random fluctuation, consistent with a background-only hypothesis. An extension of this analysis to include newer IceCube data, taken with 40 strings and using a likelihood approach, is discussed in the outlook.
4 pages, 1 figure, proceedings of ECRS 2010 held in Turku, submitted to Astrophys. Space Sci. Trans
References in corpus (6)
- Update on the correlation of the highest energy cosmic rays with nearby extragalactic matter
- Methods for point source analysis in high energy neutrino telescopes
- Time-Integrated Searches for Point-like Sources of Neutrinos with the 40-String IceCube Detector
- Search for Correlations between HiRes Stereo Events and Active Galactic Nuclei
- Measurement of the Flux of Ultra High Energy Cosmic Rays by the Stereo Technique
- Multimessenger search for point sources: ultra-high energy cosmic rays and neutrinos