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

Abstract

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.

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

References in corpus (6)

• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Preliminary Maps and Basic Results
• Is the Giant Radio Galaxy M87 a TeV Gamma-Ray Emitter?
• Evidence of TeV gamma-ray emission from the nearby starburst galaxy NGC 253
• Detection of diffuse TeV gamma-ray emission from the nearby starburst galaxy NGC 253
• Search for TeV gamma ray emission from the Andromeda galaxy
• Galactic Gamma-Ray Halo of the Nearby Starburst Galaxy NGC 253

Cited by in corpus (6)

• Detection of Sub-TeV Gamma-Rays from the Galactic Center Direction by CANGAROO-II
• X-ray Observations of the Compact Source in CTA 1
• A Search for TeV Gamma-ray Emission from the PSR B1259-63/SS2883 Binary System with the CANGAROO-II 10-m Telescope
• TeV Blazars - Observations and Models
• CANGAROO-III Search for Gamma Rays from Centaurus A and the $\omega$ Centauri Region
• A search for very high energy gamma-ray emission from the starburst galaxy NGC 253 with H.E.S.S