Münster 2017 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 82: Neutrinoastronomie 3

T 82.3: Vortrag

Mittwoch, 29. März 2017, 17:20–17:35, H 1

Stacking point source search of low energy contribution at the HESE track positions — •Thorben Menne for the IceCube collaboration — TU Dortmund

The IceCube detector is a cubic kilometer sized neutrino telescope located at the South Pole. One main goal is to observe neutrinos originating from a single or multiple sources in the sky. Despite the discovery of multiple neutrinos of astrophysical origin no significant source of these high energy events has been found in a point source follow-up analysis yet. Also no significant clustering of lower energy neutrinos at a single point has been found in a search with 7 years of IceCube data. This analysis aims to find a signal from lower energy neutrinos originating from the positions of HESE track events with a stacking method. It is searched for combined spatial clustering of lower energy events at those source locations. The usual stacking likelihood approach is used which combines signal from all source positions. Because the HESE events and thus the source positions have a positional uncertainty due to event reconstruction a slight modification in the fitting procedure is used. The positions are not kept fixed but are allowed to vary, using the full sky reconstruction likelihood landscape for each event as a prior to constrain the source positions around their original best fits.