Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-11-25
Astron.Astrophys. 396 (2002) L1-L4
Astronomy and Astrophysics
Astrophysics
4 pages, double colomn, 3 figures, aa.cls
Scientific paper
10.1051/0004-6361:20021565
We report the TeV gamma-ray observations of the nearby normal spiral galaxy NGC 253. At a distance of $\sim$2.5 Mpc, NGC 253 is one of the nearest starburst galaxies. This relative closeness, coupled with the high star formation rate in the galaxy, make it a good candidate TeV gamma-ray source. Observations were carried out in 2000 and 2001 with the CANGAROO-II 10 m imaging atmospheric Cerenkov telescope. TeV gamma-ray emission is detected at the $\sim 11\sigma$ level with a flux of $(7.8 \pm 2.5)\times 10^{-12} {\rm cm}^{-2} {\rm sec}^{-1}$ at energies $>$0.5 TeV. The data indicate that the emission region is broader than the point spread function of our telescope.
collaboration CANGAROO-II
Enomoto Ryoji
Itoh C.
Yanagita Shohei
Yoshida Tadashi
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