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Detection of diffuse TeV gamma-ray emission from the nearby starburst galaxy NGC 253

C. Itoh·R. Enomoto·S. Yanagita·T. Yoshida·CANGAROO-II collaboration
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Abstract

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 $\sim 11σ$ 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.

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C. Itoh, R. Enomoto, S. Yanagita, T. Yoshida, CANGAROO-II collaboration. 2002-11-25. Detection of diffuse TeV gamma-ray emission from the nearby starburst galaxy NGC 253. https://doi.org/10.1051/0004-6361%3A20021565

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