Search for TeV gamma ray emission from the Andromeda galaxy

Abstract

Using the HEGRA system of imaging atmospheric Cherenkov telescopes, the Andromeda galaxy (M31) was surveyed for TeV gamma ray emission. Given the large field of view of the HEGRA telescopes, three pointings were sufficient to cover all of M31, including also M32 and NGC205. No indications for point sources of TeV gamma rays were found. Upper limits are given at a level of a few percent of the Crab flux. A specific search for monoenergetic gamma-ray lines from annihilation of supersymmetric dark matter particles accumulating near the center of M31 resulted in flux limits in the 10^-13/cm^2s range, well above the predicted MSSM flux levels except for models with pronounced dark-matter spikes or strongly enhanced annihilation rates.

Latex, 7 pages, 4 Figures, submitted to A&A

References in corpus (2)

• Dark Matter Spikes and Annihilation Radiation from the Galactic Center
• Prospects for Detecting Supersymmetric Dark Matter at Post-LEP Benchmark Points

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• On the Relevance of Sharp Gamma-Ray Features for Indirect Dark Matter Searches
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• A Search for Dark Matter Annihilation with the Whipple 10m Telescope
• Dark Matter Indirect Signatures
• Gamma-Ray Lines from Radiative Dark Matter Decay
• Exploring A Cosmic-Ray Origin of the Multi-wavelength Emission in M31
• Indirect Search for Dark Matter in M31 with the CELESTE Experiment
• Dark Matter Line Searches with the Cherenkov Telescope Array
• TeV Dark Matter Searches in the Extragalactic Gamma-Ray Sky
• Constraints on Cold Dark Matter in the Gamma-ray Halo of NGC 253
• A decaying neutralino as dark matter and its gamma ray spectrum
• Spectral cutoffs in indirect dark matter searches
• The Contribution From TeV Halos to the Isotropic Gamma-Ray Background