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Title: Gamma-ray bounds from EAS detectors and heavy decaying dark matter constraints

Abstract

The very high energy Galactic γ-ray sky is partially opaque in the (0.1–10) PeV energy range. In the light of the recently detected high energy neutrino flux by IceCube, a comparable very high energy γ-ray flux is expected in any scenario with a sizable Galactic contribution to the neutrino flux. Here we elaborate on the peculiar energy and anisotropy features imposed upon these very high energy γ-rays by the absorption on the cosmic microwave background photons and Galactic interstellar light. As a notable application of our considerations, we study the prospects of probing the PeV-scale decaying DM scenario, proposed as a possible source of IceCube neutrinos, by extensive air shower (EAS) cosmic ray experiments. In particular, we show that anisotropy measurements at EAS experiments are already sensitive to τ{sub DM}∼ O(10{sup 27}) s and future measurements, using better gamma/hadron separation, can improve the limit significantly.

Authors:
 [1];  [2]
  1. INFN, Laboratori Nazionali del Gran Sasso, Assergi, AQ (Italy)
  2. LAPTh, Univ. de Savoie Mont Blanc, CNRS, B.P. 110, Annecy-le-Vieux, F-74941 France (France)
Publication Date:
OSTI Identifier:
22525288
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2015; Journal Issue: 10; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; ANISOTROPY; COMPARATIVE EVALUATIONS; COSMIC GAMMA SOURCES; COSMIC PHOTONS; EXTENSIVE AIR SHOWERS; GAMMA RADIATION; HADRONS; INTERSTELLAR SPACE; LIMITING VALUES; MILKY WAY; NEUTRINOS; NONLUMINOUS MATTER; PEV RANGE; PROBES; RELICT RADIATION; VISIBLE RADIATION

Citation Formats

Esmaili, Arman, and Serpico, Pasquale Dario, E-mail: arman.esmaili@lngs.infn.it, E-mail: serpico@lapth.cnrs.fr. Gamma-ray bounds from EAS detectors and heavy decaying dark matter constraints. United States: N. p., 2015. Web. doi:10.1088/1475-7516/2015/10/014.
Esmaili, Arman, & Serpico, Pasquale Dario, E-mail: arman.esmaili@lngs.infn.it, E-mail: serpico@lapth.cnrs.fr. Gamma-ray bounds from EAS detectors and heavy decaying dark matter constraints. United States. doi:10.1088/1475-7516/2015/10/014.
Esmaili, Arman, and Serpico, Pasquale Dario, E-mail: arman.esmaili@lngs.infn.it, E-mail: serpico@lapth.cnrs.fr. Thu . "Gamma-ray bounds from EAS detectors and heavy decaying dark matter constraints". United States. doi:10.1088/1475-7516/2015/10/014.
@article{osti_22525288,
title = {Gamma-ray bounds from EAS detectors and heavy decaying dark matter constraints},
author = {Esmaili, Arman and Serpico, Pasquale Dario, E-mail: arman.esmaili@lngs.infn.it, E-mail: serpico@lapth.cnrs.fr},
abstractNote = {The very high energy Galactic γ-ray sky is partially opaque in the (0.1–10) PeV energy range. In the light of the recently detected high energy neutrino flux by IceCube, a comparable very high energy γ-ray flux is expected in any scenario with a sizable Galactic contribution to the neutrino flux. Here we elaborate on the peculiar energy and anisotropy features imposed upon these very high energy γ-rays by the absorption on the cosmic microwave background photons and Galactic interstellar light. As a notable application of our considerations, we study the prospects of probing the PeV-scale decaying DM scenario, proposed as a possible source of IceCube neutrinos, by extensive air shower (EAS) cosmic ray experiments. In particular, we show that anisotropy measurements at EAS experiments are already sensitive to τ{sub DM}∼ O(10{sup 27}) s and future measurements, using better gamma/hadron separation, can improve the limit significantly.},
doi = {10.1088/1475-7516/2015/10/014},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 10,
volume = 2015,
place = {United States},
year = {2015},
month = {10}
}