دانلود رایگان مقاله تفسیر جستجو اخترفیزیک از زاویه همبستگی نوترینو مقیاس کوچک با مکعب یخ

ABSTRACT

The IceCube Neutrino Observatory has discovered a diffuse all-flavor flux of high-energy astrophysical neutrinos. However, the corresponding astrophysical sources have not yet been identified. Neither signifi- cant point sources nor significant angular correlations of event directions have been observed by IceCube or other instruments to date. We present a new method to interpret the non-observation of angular correlations in terms of exclusions on the strength and number of point-like neutrino sources in generic astrophysical scenarios. Additionally, we constrain the presence of these sources taking into account the measurement of the diffuse high-energy neutrino flux by IceCube. We apply the method to two types of astrophysically motivated source count distributions: The first type is obtained by considering the cosmological evolution of the co-moving density of active galaxies, while the second type is directly derived from the gamma ray source count distribution observed by Fermi-LAT. As a result, we constrain the possible parameter space for both types of source count distributions.

6. Summary

We have developed a method to interpret the results from analyses of angular correlations in IceCube muon neutrino data in terms of astrophysical scenarios. In addition, the observed astrophysical neutrino flux can be introduced as a boundary condition. We have shown that already with early data from the partly installed IceCube detector astrophysical scenarios can be constrained. This is especially the case for soft energy spectra. We expect a substantially improved sensitivity once results for the angular correlation with the full IceCube detector become available.