This article is cited in 23 papers

ASTROPHYSICS AND COSMOLOGY

Search for Galactic disk and halo components in the arrival directions of high-energy astrophysical neutrinos

S. V. Troitsky

Institute for Nuclear Research of the RAS, 117312 Moscow, Russia

Abstract: Arrival directions of 40 neutrino events with energies ${\gtrsim}$ 100 TeV, observed by the IceCube experiment, are studied. Their distribution in the Galactic latitude and in the angular distance to the Galactic Center allow to search for the Milky-Way disk and halo-related components, respectively. No statistically significant evidence for the disk component is found, though even 100 % disk origin of the flux is allowed at the 90 % confidence level. Contrary, the Galactic Center–Anticenter dipole anisotropy, specific for dark-matter decays (annihilation) or for interactions of cosmic rays with the extended halo of circumgalactic gas, is clearly favoured over the isotropic distribution (the probability of a fluctuation of the isotropic signal is ${\sim}$ 2 %).

Received: 05.11.2015

Language: English

DOI: 10.7868/S0370274X15240017

 English version: Journal of Experimental and Theoretical Physics Letters, 2015, 102:12, 785–788

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