This article is an erratum for: [this article] [this article]

A&A 462, 67-71 (2007)
DOI: 10.1051/0004-6361:20066244

Erratum

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

C. Itoh¹, R. Enomoto², S. Yanagita¹, T. Yoshida¹, A. Asahara³, G. V. Bicknell⁴, R. W. Clay⁵, P. G. Edwards⁶, S. Gunji⁷, S. Hara^{3, 8}, T. Hara⁹, T. Hattori¹⁰, Shin. Hayashi¹¹, Sei. Hayashi¹¹, S. Kabuki², F. Kajino¹¹, H. Katagiri², A. Kawachi², T. Kifune¹², H. Kubo³, J. Kushida^{3, 8}, Y. Matsubara¹³, Y. Mizumoto¹⁴, M. Mori², H. Moro¹⁰, H. Muraishi¹⁵, Y. Muraki¹³, T. Naito⁹, T. Nakase¹⁰, D. Nishida³, K. Nishijima¹⁰, K. Okumura², M. Ohishi², J. R. Patterson⁵, R. J. Protheroe⁵, K. Sakurazawa⁸, D. L. Swaby⁵, T. Tanimori³, F. Tokanai⁷, K. Tsuchiya², H. Tsunoo², T. Uchida², A. Watanabe⁷, S. Watanabe³, and T. Yoshikoshi<sup>16

1</sup>  Faculty of Science, Ibaraki University, Mito, Ibaraki 310-8512, Japan
²  Institute for Cosmic Ray Research, Univ. of Tokyo, Kashiwa, Chiba 277-8582, Japan
    e-mail: enomoto@icrr.u-tokyo.ac.jp
³  Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
⁴  MSSSO, Australian National University, ACT 2611, Australia
⁵  Department of Physics and Math. Physics, University of Adelaide, SA 5005, Australia
⁶  Institute for Space and Aeronautical Science, Sagamihara, Kanagawa 229-8510, Japan
⁷  Department of Physics, Yamagata University, Yamagata, Yamagata 990-8560, Japan
⁸  Department of Physics, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan
⁹  Faculty of Management Information, Yamanashi Gakuin University, Kofu,Yamanashi 400-8575, Japan
¹⁰  Department of Physics, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan
¹¹  Department of Physics, Konan University, Hyogo 658-8501, Japan
¹²  Faculty of Engineering, Shinshu University, Nagano, Nagano 380-8553, Japan
¹³  STE Laboratory, Nagoya University, Nagoya, Aichi 464-8601, Japan
¹⁴  National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan
¹⁵  Department of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, Ibaraki 300-0394, Japan
¹⁶  Department of Physics, Osaka City University, Osaka, Osaka 558-8585, Japan

(Received 14 August 2006 / Accepted 29 September 2006)

Erratum of A&A  396 p. L1

Erratum of A&A  402 p. 443

Abstract
Aims.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.
Methods.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.
Results. The result by the CANGAROO-III was negative. The upper limit of gamma ray flux was 5.8% Crab at 0.58 TeV 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.

Key words: gamma rays: observations -- galaxies: starburst -- galaxies: individual: NGC 253 -- galaxies: halos

© ESO 2007

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