Searches for periodic neutrino emission from binary systems with 22 and 40 strings of IceCube
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In this paper, we present the results of searches for periodic neutrino emission from a catalog of binary systems. Such modulation, observed in the photon flux, would be caused by the geometry of these systems. In the analysis, the period is fixed by these photon observations, while the phase and duration of the neutrino emission are treated as free parameters to be fit with the data. If the emission occurs during ~20% or less of the total period, this analysis achieves better sensitivity than a time-integrated analysis. We use the IceCube data taken from 2007 May 31 to 2008 April 5 with its 22 string configuration and from 2008 April 5 to 2009 May 20 with its 40 string configuration. No evidence for neutrino emission is found, with the strongest excess occurring for Cygnus X-3 at 2.1σ significance after accounting for trials. Neutrino flux upper limits for both periodic and time-integrated emission are provided.
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Abbasi, R. and Abdou, Y. and Abu-Zayyad, T. and Ackermann, M. and Adams, J. and Aguilar, J. and Ahlers, M. et al. 2012. Searches for periodic neutrino emission from binary systems with 22 and 40 strings of IceCube. Astrophysical Journal. 748 (2).
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Astrophysical Journal
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Department of Exploration Geophysics
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