A search for arrival direction clustering in the HiRes-I monocular data above 1019.5 eV

Abbasi, Rasha; Abu‐Zayyad, T.; Amann, J. F.; Archbold, G.; Atkins, R.; Bellido, J. A.; Belov, K.; Belz, J. W.; BenZvi, S.; Bergman, D. R.; Burt, G. W.; Cao, Zhen; Clay, R. W.; Connolly, B.; Dawson, B. R.; Deng, W.; Fedorova, Y.; Findlay, J.; Finley, C.; Hanlon, W.; Hoffman, C. M.; Holzscheiter, M. H.; Hughes, G.; Hüntemeyer, P.; Jui, C.; Kim, K.; Kirn, M.; Loh, E. C.; Maestas, M. M.; Manago, Naohiro; Marek, Lukáš; Martens, K.; Matthews, John; Matthews, J. N.; O’Neill, A.; Painter, C. A.; Perera, L.; Reil, K.; Riehle, R.; Roberts, M.; Sasaki, M.; Schnetzer, S.; Simpson, K. M.; Sinnis, G.; Smith, J. D.; Snow, R.; Sokolsky, P.; Song, C.; Springer, R. W.; Stokes, B. T.; Thomas, J. R.; Thomas, S. B.; Thomson, G. B.; Tupa, D.; Westerhoff, S.; Wiencke, L.; Zech, A.

doi:10.1016/j.astropartphys.2004.07.003

Cited by 20 publications

(5 citation statements)

References 9 publications

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“…Limits were also set for other assumed energy spectra, including E −3 and E −2. 25 uncertainties than estimations from MC simulations. Considering the astrophysical flux previously observed in IceCube [12], a small number (≤ 10) of isotropically distributed sources in the northern hemisphere of very hard energy spectra, like E −2 , is excluded as it was by former IceCube analyses [15].…”

Section: Discussionmentioning

confidence: 91%

“…It is designed to detect an event clustering at angular scales θ comparable to the detector resolution, while no prior information about the potential sources is required. The amount of clustering is then obtained from scanning simultaneously over θ and different bins for the minimum energy E min that optimizes the sensitivity [24,25].…”

Section: Two-point Autocorrelation Testmentioning

confidence: 99%

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Searches for small-scale anisotropies from neutrino point sources with three years of IceCube data

Aartsen,

Ackermann,

Adams

et al. 2014

Preprint

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Recently, IceCube found evidence for a diffuse signal of astrophysical neutrinos in an energy range of ∼ 60 TeV to the PeV-scale [1]. The origin of those events, being a key to understanding the origin of cosmic rays, is still an unsolved question. So far, analyses have not succeeded to resolve the diffuse signal into point-like sources. Searches including a maximumlikelihood-ratio test, based on the reconstructed directions and energies of the detected down-and up-going neutrino candidates, were also performed on IceCube data leading to the exclusion of bright point sources. In this paper, we present two methods to search for faint neutrino point sources in three years of IceCube data, taken between 2008 and 2011. The first method is an autocorrelation test, applied separately to the northern and southern sky. The second method is a multipole analysis, which expands the measured data in the northern hemisphere into spherical harmonics and uses the resulting expansion coefficients to separate signal from background. With both methods, the results are consistent with the background expectation with a slightly more sparse spatial distribution, corresponding to an underfluctuation. Depending on the assumed number of sources, the resulting upper limit on the flux per source in the northern hemisphere for an E −2 energy spectrum ranges from ∼ 1.5 • 10 −8 GeV/cm 2 s −1 , in the case of one assumed source, to ∼ 4 • 10 −10 GeV/cm 2 s −1 , in the case of 3500 assumed sources.

show abstract

Section: Discussionmentioning

confidence: 91%

Section: Two-point Autocorrelation Testmentioning

confidence: 99%

Searches for small-scale anisotropies from neutrino point sources with three years of IceCube data

Aartsen,

Ackermann,

Adams

et al. 2014

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…It is designed to detect an event clustering at angular scales h comparable to the detector resolution, while no prior information about the potential sources is required. The amount of clustering is then obtained from scanning simultaneously over h and different bins for the minimum energy E min that optimizes the sensitivity [24,25].…”

Section: Two-point Autocorrelation Testmentioning

confidence: 99%

Searches for small-scale anisotropies from neutrino point sources with three years of IceCube data

Aartsen¹,

Ackermann²,

Adams³

et al. 2015

Astroparticle Physics

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a b s t r a c tRecently, IceCube found evidence for a diffuse signal of astrophysical neutrinos in an energy range of $ 60 TeV to the PeV-scale [1]. The origin of those events, being a key to understanding the origin of cosmic rays, is still an unsolved question. So far, analyses have not succeeded to resolve the diffuse signal into point-like sources. Searches including a maximum-likelihood-ratio test, based on the reconstructed directions and energies of the detected down-and up-going neutrino candidates, were also performed on IceCube data leading to the exclusion of bright point sources. In this paper, we present two methods to search for faint neutrino point sources in three years of IceCube data, taken between 2008 and 2011. The first method is an autocorrelation test, applied separately to the northern and southern sky. The second method is a multipole analysis, which expands the measured data in the northern hemisphere into spherical harmonics and uses the resulting expansion coefficients to separate signal from background. With both methods, the results are consistent with the background expectation with a slightly more sparse spatial distribution, corresponding to an underfluctuation. Depending on the assumed number of sources, the resulting upper limit on the flux per source in the northern hemisphere for an E À2 energy spectrum ranges from $ 1:5 Á 10 À8 GeV/cm 2 s À1 , in the case of one assumed source, to $ 4 Á 10 À10 GeV/cm 2 s À1 , in the case of 3500 assumed sources.

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“…This result could not be confirmed. An analysis of a HiRes I data set corresponding to an exposure similar to that of AGASA did not reveal any evidence for small scale clustering [463]. Also no significant clustering is seen in a data set from HiRes stereo observations of more than 270 showers with E > 10 19 eV [464] and in the combined AGASA-HiRes stereo data set with E > 4 × 10 19 eV [465].…”

Section: Extragalactic Cosmic Raysmentioning

confidence: 99%

Cosmic rays from the knee to the highest energies

Blümer¹,

Engel²,

Hörandel

2009

Progress in Particle and Nuclear Physics

277

187

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A search for arrival direction clustering in the HiRes-I monocular data above 1019.5 eV

Cited by 20 publications

References 9 publications

Searches for small-scale anisotropies from neutrino point sources with three years of IceCube data

Searches for small-scale anisotropies from neutrino point sources with three years of IceCube data

Searches for small-scale anisotropies from neutrino point sources with three years of IceCube data

Cosmic rays from the knee to the highest energies

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