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Neutrino Analysis of the 2010 September Crab Nebula Flare and Time-Integrated Constraints on Neutrino Emission from the Crab using IceCube
Stockholm University, Faculty of Science, Department of Physics. (Systemfysik)
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). (Elementarpartikelfysik)
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). (Elementarpartikelfysik)
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). (Elementarpartikelfysik)
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2012 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 745, no 1, 45- p.Article in journal (Refereed) Published
Abstract [en]

We present the results of a search for high-energy muon neutrinos with the IceCube detector in coincidence with the Crab Nebula flare reported on 2010 September by various experiments. Due to the unusual flaring state of the otherwise steady source we performed a prompt analysis of the 79-string configuration data to search for neutrinos that might be emitted along with the observed γ-rays. We performed two different and complementary data selections of neutrino events in the time window of 10 days around the flare. One event selection is optimized for discovery of E –2 ν neutrino spectrum typical of first-order Fermi acceleration. A similar event selection has also been applied to the 40-string data to derive the time-integrated limits to the neutrino emission from the Crab. The other event selection was optimized for discovery of neutrino spectra with softer spectral index and TeV energy cutoffs as observed for various Galactic sources in γ-rays. The 90% confidence level (CL) best upper limits on the Crab flux during the 10 day flare are 4.73 × 10–11 cm–2 s–1 TeV–1 for an E –2 ν neutrino spectrum and 2.50 × 10–10 cm–2 s–1 TeV–1 for a softer neutrino spectra of E –2.7 ν, as indicated by Fermi measurements during the flare. In this paper, we also illustrate the impact of the time-integrated limit on the Crab neutrino steady emission. The limit obtained using 375.5 days of the 40-string configuration is compared to existing models of neutrino production from the Crab and its impact on astrophysical parameters is discussed. The most optimistic predictions of some models are already rejected by the IceCube neutrino telescope with more than 90% CL.

Place, publisher, year, edition, pages
2012. Vol. 745, no 1, 45- p.
Keyword [en]
gamma rays: general, ISM: supernova remnants, neutrinos, pulsars: individual (Crab Pulsar)
National Category
Subatomic Physics
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-69590DOI: 10.1088/0004-637X/745/1/45ISI: 000300316600045OAI: oai:DiVA.org:su-69590DiVA: diva2:477873
Projects
IceCube
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Note

266

Available from: 2012-01-14 Created: 2012-01-14 Last updated: 2017-12-08Bibliographically approved
In thesis
1. Searches for Dark Matter with IceCube and DeepCore: New constraints on theories predicting dark matter particles
Open this publication in new window or tab >>Searches for Dark Matter with IceCube and DeepCore: New constraints on theories predicting dark matter particles
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The cubic-kilometer sized IceCube neutrino observatory, constructed in the glacial ice at the South Pole, searches indirectly for dark matter via neutrinos from dark matter self-annihilations. It has a high discovery potential through striking signatures. This thesis presents searches for dark matter annihilations in the center of the Sun using experimental data collected with IceCube.

The main physics analysis described here was performed for dark matter in the form of weakly interacting massive particles (WIMPs) with the 79-string configuration of the IceCube neutrino telescope. For the first time, the DeepCore sub-array was included in the analysis, lowering the energy threshold and extending the search to the austral summer. Data from 317 days live-time are consistent with the expected background from atmospheric muons and neutrinos. Upper limits were set on the dark matter annihilation rate, with conversions to limits on the WIMP-proton scattering cross section, which initiates the WIMP capture process in the Sun.These are the most stringent spin-dependent WIMP-proton cross-sections limits to date above 35 GeV for most WIMP models.

In addition, a formalism for quickly and directly comparing event-level IceCube data with arbitrary annihilation spectra in detailed model scans, considering not only total event counts but also event directions and energy estimators, is presented. Two analyses were made that show an application of this formalism to both model exclusion and parameter estimation in models of supersymmetry.

An analysis was also conducted that extended for the first time indirect dark matter searches with neutrinos using IceCube data, to an alternative dark matter candidate, Kaluza-Klein particles, arising from theories with extra space-time dimensions.

The methods developed for the solar dark matter search were applied to look for neutrino emission during a flare of the Crab Nebula in 2010.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2013. 113 p.
Keyword
Dark matter, neutrinos, neutrino telescopes, IceCube, DeepCore, dark matter experiments
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-89820 (URN)978-91-7447-716-0 (ISBN)
Public defence
2013-06-14, sal FB42, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Opponent
Supervisors
Available from: 2013-05-23 Created: 2013-05-10 Last updated: 2013-05-16Bibliographically approved

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Bohm, ChristianDanninger, MatthiasFinley, ChadHulth, Per OlofHultqvist, KlasJohansson, HenrikSeo, Seon-HeeWalck, ChristianZoll, Marcel
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