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Search For Sources Of High-Energy Neutrons With Four Years Of Data From The Icetop Detector
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, New Zealand..
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2016 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 830, no 2, 129Article in journal (Refereed) Published
Abstract [en]

IceTop is an air-shower array located on the Antarctic ice sheet at the geographic South Pole. IceTop can detect an astrophysical flux of neutrons from Galactic sources as an excess of cosmic-ray air showers arriving from the source direction. Neutrons are undeflected by the Galactic magnetic field and can typically travel 10 (E/PeV) pc before decay. Two searches are performed using 4 yr of the IceTop data set to look for a statistically significant excess of events with energies above 10 PeV (10(16) eV) arriving within a small solid angle. The all-sky search method covers from -90 degrees to approximately -50 degrees in declination. No significant excess is found. A targeted search is also performed, looking for significant correlation with candidate sources in different target sets. This search uses a higher-energy cut (100 PeV) since most target objects lie beyond 1 kpc. The target sets include pulsars with confirmed TeV energy photon fluxes and high-mass X-ray binaries. No significant correlation is found for any target set. Flux upper limits are determined for both searches, which can constrain Galactic neutron sources and production scenarios.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2016. Vol. 830, no 2, 129
Keyword [en]
astroparticle physics, cosmic rays, methods: data analysis
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-322893DOI: 10.3847/0004-637X/830/2/129ISI: 000400471300001OAI: oai:DiVA.org:uu-322893DiVA: diva2:1103970
Funder
Swedish Research CouncilSwedish Polar Research SecretariatSwedish National Infrastructure for Computing (SNIC)German Research Foundation (DFG)
Available from: 2017-05-31 Created: 2017-05-31 Last updated: 2017-05-31Bibliographically approved

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Botner, OlgaBurgman, AlexanderEuler, SebastianHallgren, AllanPerez de los Heros, CarlosStröm, RickardTaavola, HenricUnger, Lisa E.

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Botner, OlgaBurgman, AlexanderEuler, SebastianHallgren, AllanPerez de los Heros, CarlosStröm, RickardTaavola, HenricUnger, Lisa E.
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