Journal
ASTRONOMY & ASTROPHYSICS
Volume 402, Issue 2, Pages 443-455Publisher
E D P SCIENCES
DOI: 10.1051/0004-6361:20030247
Keywords
gamma rays : observation; galaxies : starburst; galaxies : individual : NGC 253; galaxies : halos; ISM : cosmic rays
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TeV gamma-rays were recently detected from the nearby normal spiral galaxy NGC 253 (Itoh et al. 2002). Observations to detect the Cherenkov light images initiated by gamma-rays from the direction of NGC 253 were carried out in 2000 and 2001 over a total period of similar to150 hours. The orientation of images in gamma-ray-like events is not consistent with emission from a point source, and the emission region corresponds to a size greater than 10 kpc in radius. Here, detailed descriptions of the analysis procedures and techniques are given.
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