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Lowering Icecube'S Energy Threshold For Point Source Searches In The Southern Sky
Univ Adelaide, Dept Phys, Adelaide, SA 5005, Australia..
Tech Univ Munich, Dept Phys, D-85748 Garching, Germany..
DESY, D-15735 Zeuthen, Germany..
Univ Canterbury, Dept Phys & Astron, Private Bag 4800, Christchurch 1, New Zealand..
Vise andre og tillknytning
2016 (engelsk)Inngår i: Astrophysical Journal Letters, ISSN 2041-8205, E-ISSN 2041-8213, Vol. 824, nr 2, artikkel-id L28Artikkel i tidsskrift (Fagfellevurdert) Published
Resurstyp
Text
Abstract [en]

Observation of a point source of astrophysical neutrinos would be a "smoking gun" signature of a cosmic-ray accelerator. While IceCube has recently discovered a diffuse flux of astrophysical neutrinos, no localized point source has been observed. Previous IceCube searches for point sources in the southern sky were restricted by either an energy threshold above a few hundred TeV or poor neutrino angular resolution. Here we present a search for southern sky point sources with greatly improved sensitivities to neutrinos with energies below 100 TeV. By selecting charged-current nu(mu) interacting inside the detector, we reduce the atmospheric background while retaining efficiency for astrophysical neutrino-induced events reconstructed with sub-degree angular resolution. The new event sample covers three years of detector data and leads to a factor of 10 improvement in sensitivity to point sources emitting below 100 TeV in the southern sky. No statistically significant evidence of point sources was found, and upper limits are set on neutrino emission from individual sources. A posteriori analysis of the highest-energy (similar to 100 TeV) starting event in the sample found that this event alone represents a 2.8 sigma deviation from the hypothesis that the data consists only of atmospheric background.

sted, utgiver, år, opplag, sider
2016. Vol. 824, nr 2, artikkel-id L28
Emneord [en]
astroparticle physics, neutrinos
HSV kategori
Identifikatorer
URN: urn:nbn:se:uu:diva-299728DOI: 10.3847/2041-8205/824/2/L28ISI: 000378168200012OAI: oai:DiVA.org:uu-299728DiVA, id: diva2:949993
Forskningsfinansiär
Swedish Research CouncilSwedish Polar Research SecretariatSwedish National Infrastructure for Computing (SNIC)Knut and Alice Wallenberg FoundationGerman Research Foundation (DFG)Tilgjengelig fra: 2016-07-26 Laget: 2016-07-26 Sist oppdatert: 2017-11-28bibliografisk kontrollert

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Boersma, David J.Botner, OlgaBurgman, AlexanderHallgren, AllanStröm, RickardUnger, Lisa

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