☆ 4.7 Article

Gamma rays and neutrinos from dark matter annihilation in galaxy clusters

PHYSICAL REVIEW D (2010)

期刊

PHYSICAL REVIEW D

卷 82, 期 2, 页码 -

出版社

AMER PHYSICAL SOC

DOI: 10.1103/PhysRevD.82.023506

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类别

Astronomy & Astrophysics Physics, Particles & Fields

资金

Natural Sciences Foundation of China [10773011, 10775001, 10635030]
973 project [2010CB833000]
Chinese Ministry of Education

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摘要

The gamma-ray and neutrino emissions from dark matter (DM) annihilation in galaxy clusters are studied. After about one year of operation of Fermi-LAT, several nearby clusters are reported with stringent upper limits of GeV gamma-ray emission. We use the Fermi-LAT upper limits of these clusters to constrain the DM model parameters. We find that the DM model distributed with substructures predicted in cold DM scenario is strongly constrained by Fermi-LAT gamma-ray data. Especially for the leptonic annihilation scenario which may account for the e(+/-) excesses discovered by PAMELA/Fermi-LAT/HESS, the constraint on the minimum mass of substructures is of the level 10(2)-10(3) M-circle dot, which is much larger than that expected in the cold DM picture, but is consistent with a warm DM scenario. We further investigate the sensitivity of neutrino detections of the clusters by IceCube. It is found that neutrino detection is much more difficult than gamma-rays. Only for very heavy DM (similar to 10 TeV) together with a considerable branching ratio to line neutrinos the neutrino sensitivity is comparable with that of gamma-rays.

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Constraints on Heavy Decaying Dark Matter from 570 Days of LHAASO Observations

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Summary: In this study, the kilometer square array (KM2A) of the large high altitude air shower observatory (LHAASO) was used to analyze dark matter by searching for signals at energies above 10 TeV. The results showed no excess of dark matter signals and placed strong constraints on the lifetime of heavy dark matter particles. These findings have important implications for dark matter interpretations of the diffuse astrophysical high-energy neutrino emission.

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