SIMBAD references

A gamma-ray halo in the nearby starburst galaxy NGC 253 was found by the CANGAROO-II Imaging Atmospheric Cerenkov Telescope. By fitting the energy spectrum with expected curves from cold dark matter (CDM) annihilations, we constrain the CDM annihilation rate in the halo of NGC 253. Upper limits for the CDM density were obtained in the wide mass range between 0.5 and 50 TeV. Although these limits are higher than the expected values, they are complementary to the other experimental techniques, especially considering the extended energy coverage. We also investigate the next astronomical targets to improve these limits.