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2007A&A...462...67I - Astronomy and Astrophysics, volume 462, 67-71 (2007/1-4)

Evidence of TeV gamma-ray emission from the nearby starburst galaxy NGC 253.

ITOH C., ENOMOTO R., YANAGITA S., YOSHIDA T., ASAHARA A., BICKNELL G.V., CLAY R.W., EDWARDS P.G., GUNJI S., HARA S., HARA T., HATTORI T., HAYASHI SH., HAYASHI SE., KABUKI S., KAJINO F., KATAGIRI H., KAWACHI A., KIFUNE T., KUBO H., KUSHIDA J., MATSUBARA Y., MIZUMOTO Y., MORI M., MORO H., MURAISHI H., MURAKI Y., NAITO T., NAKASE T., NISHIDA D., NISHIJIMA K., OKUMURA K., OHISHI M., PATTERSON J.R., PROTHEROE R.J., SAKURAZAWA K., SWABY D.L., TANIMORI T., TOKANAI F., TSUCHIYA K., TSUNOO H., UCHIDA T., WATANABE A., WATANABE S. and YOSHIKOSHI T.

Abstract (from CDS):

The CANGAROO-II telescope observed sub-TeV gamma-ray emission from the nearby starburst galaxy NGC 253. The emission region was extended with a radial size of 0.3-0.6 degree. On the contrary, HESS could not confirm this emission and gave upper limits at the level of the CANGAROO-II flux. In order to resolve this discrepancy, we analyzed new observational results for NGC 253 by CANGAROO-III and also assessed the results by CANGAROO-II. Observation was made with three telescopes of the CANGAROO-III in October 2004. We analyzed three-fold coincidence data by the robust Fisher Discriminant method to discriminate gamma ray events from hadron events. The result by the CANGAROO-III was negative. The upper limit of gamma ray flux was 5.8% Crab at 0.58TeV for point-source assumption. In addition, the significance of the excess flux of gamma-rays by the CANGAROO-II was lowered to less than 4 sigma after assessing treatment of malfunction of photomultiplier tubes.

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Journal keyword(s): gamma rays: observations - galaxies: starburst - galaxies: individual: NGC 253 - galaxies: halos

Simbad objects: 3

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