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Title:
Possible observation of 100 TeV gamma rays from the active galaxy Centaurus A
Authors:
JANZOS Collaboration; Allen, W. H.; Bond, I. A.; Budding, E.; Conway, M. J.; Daniel, A.; Fenton, K. B.; Fujii, H.; Fujii, Z.; Hayashida, N.; Hibino, K.; Honda, M.; Humble, J. E.; Kabe, S.; Kasahara, K.; Kifune, T.; Lythe, G. D.; Masaike, A.; Matsubara, Y.; Mitsui, K.; Miura, Y.; Mori, M.; Muraki, Y.; Nagano, M.; Nakamura, T.; Nishizawa, M.; Norris, P. M.; Ogio, S.; Saito, To.; Sakata, M.; Sato, H.; Shimizu, H. M.; Spencer, M.; Storey, J. R.; Tanimori, T.; Teshima, M.; Torii, S.; Wadsworth, A.; Watase, Y.; Woodhams, M. D.; Yamamoto, Y.; Yock, P. C. M.; Yuda, T.
Affiliation:
AA(Carter National Observatory of New Zealand, Wellington, New Zealand), AB(Department of Physics, University of Auckland, Auckland, New Zealand), AC(Carter National Observatory of New Zealand, Wellington, New Zealand), AD(Department of Physics, University of Auckland, Auckland, New Zealand), AE(Department of Physics, University of Auckland, Auckland, New Zealand), AF(Department of Physics, University of Tasmania, Hobart 7001, Australia), AG(National Laboratory for High Energy Physics (KEK), Tsukuba 305, Japan), AH(Solar, Terrestrial and Environmental Laboratory, Nagoya University, Nagoya 464, Japan), AI(Institute for Cosmic Ray Research, University of Tokyo, Tokyo 188, Japan), AJ(Faculty of Engineering, Kanagawa University, Yokohama 221, Japan), AK(Institute for Cosmic Ray Research, University of Tokyo, Tokyo 188, Japan), AL(Department of Physics, University of Tasmania, Hobart 7001, Australia), AM(National Laboratory for High Energy Physics (KEK), Tsukuba 305, Japan), AN(Faculty of Engineering, Kanagawa University, Yokohama 221, Japan), AO(Institute for Cosmic Ray Research, University of Tokyo, Tokyo 188, Japan), AP(Department of Physics, University of Auckland, Auckland, New Zealand), AQ(Department of Physics, Kyoto University, Kyoto 606, Japan), AR(Solar, Terrestrial and Environmental Laboratory, Nagoya University, Nagoya 464, Japan), AS(Institute for Cosmic Ray Research, University of Tokyo, Tokyo 188, Japan), AT(National Laboratory for High Energy Physics (KEK), Tsukuba 305, Japan), AU(National Laboratory for High Energy Physics (KEK), Tsukuba 305, Japan), AV(Solar, Terrestrial and Environmental Laboratory, Nagoya University, Nagoya 464, Japan), AW(Institute for Cosmic Ray Research, University of Tokyo, Tokyo 188, Japan), AX(Department of Physics, Kyoto University, Kyoto 606, Japan), AY(Institute for Cosmic Ray Research, University of Tokyo, Tokyo 188, Japan), AZ(Department of Physics, University of Auckland, Auckland, New Zealand), BA(Department of Physics, Tokyo Institute of Technology, Tokyo 152, Japan), BB(Tokyo Metropolitan College of Aeronautical Engineering, Tokyo 116, Japan), BC(Department of Physics, Konan University, Kobe 658, Japan), BD(Department of Physics, Kyoto University, Kyoto 606, Japan), BE(Department of Physics, Kyoto University, Kyoto 606, Japan), BF(Department of Physics, University of Auckland, Auckland, New Zealand), BG(Department of Physics, University of Auckland, Auckland, New Zealand), BH(Department of Physics, Tokyo Institute of Technology, Tokyo 152, Japan), BI(Institute for Cosmic Ray Research, University of Tokyo, Tokyo 188, Japan), BJ(Faculty of Engineering, Kanagawa University, Yokohama 221, Japan), BK(Carter National Observatory of New Zealand, Wellington, New Zealand), BL(National Laboratory for High Energy Physics (KEK), Tsukuba 305, Japan), BM(Department of Physics, University of Auckland, Auckland, New Zealand), BN(Department of Physics, Konan University, Kobe 658, Japan), BO(Department of Physics, University of Auckland, Auckland, New Zealand), BP(Institute for Cosmic Ray Research, University of Tokyo, Tokyo 188, Japan)
Publication:
ASTROPARTICLE PHYSICS, Volume 1, Issue 3, p. 269-276. (APh Homepage)
Publication Date:
07/1993
Origin:
ELSEVIER
DOI:
10.1016/0927-6505(93)90012-3
Bibliographic Code:
1993APh.....1..269J

Abstract

We have searched for evidence of ultra-high energy gamma rays from the active galaxy Centaurus A in the data set of the JANZOS experiment during the period 13 October 1987 to 18 January 1992. No significant DC excess was found from this source. Excess events were found, however, in the period 14 April - 3 June 1990. The duration of the excess, 48 days, and equivalent luminosity, ~10^43 erg s^-1, are both similar to those measured previously for X-ray outbursts of Centaurus A. Furthermore, the events appear to exhibit the expected absorption feature at 200 TeV due to interactions with the 2.7 K background radiation, but the chance probability for the excess is at the 2% level. The equivalent time averaged flux during this period was (5.5+/-1.5)x10^-12 photons cm^-2s^-1 at energies >=110 TeV, about 20 times as large as the upper limit flux of steady emission, assuming a differential spectral index of -2.0. Further observations are required to confirm the result.
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