July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

Results of neutrino point source searches with 2008-2014 IceCube data above 10 TeV

Aug 3, 2015, 3:00 PM
15m
Yangtze 1 (World Forum)

Yangtze 1

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Oral contribution NU-EX Parallel NU 04

Speaker

Mr Stefan Coenders (Technische Universität München, Physik-Department)

Description

The emphasis on point source searches for astrophysical neutrinos has recently been strengthened by the unambiguous detection of high-energy astrophysical neutrinos by IceCube. So far the limited statistics and angular resolution of the relevant analyses do not resolve more than an isotropic emission of astrophysical neutrinos. We present the results of searches for point source neutrino emission using six years of integrated IceCube livetime, of which three years use the completed IceCube detector. Focusing on track-like events induced by charged-current muon-neutrinos, we attain a large statistics sample of more than 650,000 event candidates on the full sky with median angular resolution from 1° down to 0.4°, improving with higher energy. For the Southern hemisphere, the main background consists of bundles of muons created in extensive air-showers, whereas the Northern Hemisphere is dominated by neutrinos created in extensive air showers. With the hard energy spectrum observed in the diffuse astrophysical flux, a possible signal can be identified at high neutrino energy. Using an unbinned likelihood maximisation search for local clustering, IceCube is sensitive to sources in the Northern sky substantially below $10^{-12}\,{\rm TeV^{-1}\,cm^{-2}\,s^{-1}}$ for a benchmark $E^{-2}$-spectrum. We report about the status of these searches and the implications on the nature of the observed flux as well as single source candidates.
Collaboration IceCube
Registration number following "ICRC2015-I/" 1139

Primary author

Mr Stefan Coenders (Technische Universität München, Physik-Department)

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