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Five years of searches for point sources of astrophysical neutrinos with the AMANDA-II neutrino telescope

Abstract:

We report the results of a five-year survey of the northern sky to search for point sources of high energy neutrinos. The search was performed on the data collected with the AMANDA-II neutrino telescope in the years 2000 to 2004, with a live time of 1001 days. The sample of selected events consists of 4282 upward going muon tracks with high reconstruction quality and an energy larger than about 100 GeV. We found no indication of point sources of neutrinos and set 90% confidence level flux upper limits for an all-sky search and also for a catalog of 32 selected sources. For the all-sky search, our average (over declination and right ascension) experimentally observed upper limit Φ 0=(E 1 TeV) γ· d Φ d E to a point source flux of muon and tau neutrino (detected as muons arising from taus) is Φ ν μ+ ν μ 0+ Φ ν τ+ ν τ 0= 11.1× 10− 11 TeV− 1 cm− 2 s− 1, in the energy range between 1.6 TeV and 2.5 PeV for a flavor …