Constraints on Cold Dark Matter in the Gamma-ray Halo of NGC 253

Details Constraints on Cold Dark Matter in the Gamma-ray Halo of NGC 253 Constraints on Cold Dark Matter in the Gamma-ray Halo of NGC 253

2003-06-27

arxiv.org/abs/astro-ph/0306572v1

Astrophys.J.596:216-219,2003

Astronomy and Astrophysics

Astrophysics

13 pages, 5 figures, aastex.cls, natbib.sty, To appear in ApJ v596n1, Oct. 10, 2003

Scientific paper

10.1086/377732

A gamma-ray halo in a nearby starburst galaxy NGC 253 was found by the CANGAROO-II Imaging Atmospheric Cherenkov Telescope (IACT). 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, it is complementary important to the other experimental techniques, especially considering the energy coverage. We also investigate the next astronomical targets to improve these limits.

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