Possible observation of 100 TeV gamma rays from the active galaxy Centaurus a

W. H. Allen, I. A. Bond, E. Budding, M. J. Conway, A. Daniel, K. B. Fenton, H. Fujii, Z. Fujii, N. Hayashida, K. Hibino, M. Honda, J. E. Humble, S. Kabe, K. Kasahara, T. Kifune, G. D. Lythe, A. Masaike, Y. Matsubara, K. Mitsui, Y. MiuraM. Mori, Y. Muraki, M. Nagano, T. Nakamura, M. Nishizawa, P. M. Norris, S. Ogio, To Saito, M. Sakata, H. Sato, H. M. Shimizu, M. Spencer, J. R. Storey, T. Tanimori, M. Teshima, Shoji Torii, A. Wadsworth, Y. Watase, M. D. Woodhams, Y. Yamamoto, P. C M Yock, T. Yuda

Research output: Contribution to journalArticle

18 Citations (Scopus)

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, ~ 1043 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) × 10-12 photons cm-2s-1 at energies ≥ 110 TeV, about 20 times as large as the upper lim of steady emission, assuming a differential spectral index of -2.0. Further observations are required to confirm the result.

Original languageEnglish
Pages (from-to)269-276
Number of pages8
JournalAstroparticle Physics
Volume1
Issue number3
DOIs
Publication statusPublished - 1993
Externally publishedYes

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active galaxies
gamma rays
background radiation
direct current
luminosity
energy
photons
x rays
interactions

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Nuclear and High Energy Physics
  • Atomic and Molecular Physics, and Optics

Cite this

Allen, W. H., Bond, I. A., Budding, E., Conway, M. J., Daniel, A., Fenton, K. B., ... Yuda, T. (1993). Possible observation of 100 TeV gamma rays from the active galaxy Centaurus a. Astroparticle Physics, 1(3), 269-276. https://doi.org/10.1016/0927-6505(93)90012-3

Possible observation of 100 TeV gamma rays from the active galaxy Centaurus a. / 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, Shoji; Wadsworth, A.; Watase, Y.; Woodhams, M. D.; Yamamoto, Y.; Yock, P. C M; Yuda, T.

In: Astroparticle Physics, Vol. 1, No. 3, 1993, p. 269-276.

Research output: Contribution to journalArticle

Allen, WH, Bond, IA, Budding, E, Conway, MJ, Daniel, A, Fenton, KB, Fujii, H, Fujii, Z, Hayashida, N, Hibino, K, Honda, M, Humble, JE, Kabe, S, Kasahara, K, Kifune, T, Lythe, GD, Masaike, A, Matsubara, Y, Mitsui, K, Miura, Y, Mori, M, Muraki, Y, Nagano, M, Nakamura, T, Nishizawa, M, Norris, PM, Ogio, S, Saito, T, Sakata, M, Sato, H, Shimizu, HM, Spencer, M, Storey, JR, Tanimori, T, Teshima, M, Torii, S, Wadsworth, A, Watase, Y, Woodhams, MD, Yamamoto, Y, Yock, PCM & Yuda, T 1993, 'Possible observation of 100 TeV gamma rays from the active galaxy Centaurus a', Astroparticle Physics, vol. 1, no. 3, pp. 269-276. https://doi.org/10.1016/0927-6505(93)90012-3
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, Shoji ; Wadsworth, A. ; Watase, Y. ; Woodhams, M. D. ; Yamamoto, Y. ; Yock, P. C M ; Yuda, T. / Possible observation of 100 TeV gamma rays from the active galaxy Centaurus a. In: Astroparticle Physics. 1993 ; Vol. 1, No. 3. pp. 269-276.
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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, ~ 1043 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) × 10-12 photons cm-2s-1 at energies ≥ 110 TeV, about 20 times as large as the upper lim of steady emission, assuming a differential spectral index of -2.0. Further observations are required to confirm the result.",
author = "Allen, {W. H.} and Bond, {I. A.} and E. Budding and Conway, {M. J.} and A. Daniel and Fenton, {K. B.} and H. Fujii and Z. Fujii and N. Hayashida and K. Hibino and M. Honda and Humble, {J. E.} and S. Kabe and K. Kasahara and T. Kifune and Lythe, {G. D.} and A. Masaike and Y. Matsubara and K. Mitsui and Y. Miura and M. Mori and Y. Muraki and M. Nagano and T. Nakamura and M. Nishizawa and Norris, {P. M.} and S. Ogio and To Saito and M. Sakata and H. Sato and Shimizu, {H. M.} and M. Spencer and Storey, {J. R.} and T. Tanimori and M. Teshima and Shoji Torii and A. Wadsworth and Y. Watase and Woodhams, {M. D.} and Y. Yamamoto and Yock, {P. C M} and T. Yuda",
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T1 - Possible observation of 100 TeV gamma rays from the active galaxy Centaurus a

AU - Allen, W. H.

AU - Bond, I. A.

AU - Budding, E.

AU - Conway, M. J.

AU - Daniel, A.

AU - Fenton, K. B.

AU - Fujii, H.

AU - Fujii, Z.

AU - Hayashida, N.

AU - Hibino, K.

AU - Honda, M.

AU - Humble, J. E.

AU - Kabe, S.

AU - Kasahara, K.

AU - Kifune, T.

AU - Lythe, G. D.

AU - Masaike, A.

AU - Matsubara, Y.

AU - Mitsui, K.

AU - Miura, Y.

AU - Mori, M.

AU - Muraki, Y.

AU - Nagano, M.

AU - Nakamura, T.

AU - Nishizawa, M.

AU - Norris, P. M.

AU - Ogio, S.

AU - Saito, To

AU - Sakata, M.

AU - Sato, H.

AU - Shimizu, H. M.

AU - Spencer, M.

AU - Storey, J. R.

AU - Tanimori, T.

AU - Teshima, M.

AU - Torii, Shoji

AU - Wadsworth, A.

AU - Watase, Y.

AU - Woodhams, M. D.

AU - Yamamoto, Y.

AU - Yock, P. C M

AU - Yuda, T.

PY - 1993

Y1 - 1993

N2 - 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, ~ 1043 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) × 10-12 photons cm-2s-1 at energies ≥ 110 TeV, about 20 times as large as the upper lim of steady emission, assuming a differential spectral index of -2.0. Further observations are required to confirm the result.

AB - 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, ~ 1043 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) × 10-12 photons cm-2s-1 at energies ≥ 110 TeV, about 20 times as large as the upper lim of steady emission, assuming a differential spectral index of -2.0. Further observations are required to confirm the result.

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U2 - 10.1016/0927-6505(93)90012-3

DO - 10.1016/0927-6505(93)90012-3

M3 - Article

AN - SCOPUS:0002152663

VL - 1

SP - 269

EP - 276

JO - Astroparticle Physics

JF - Astroparticle Physics

SN - 0927-6505

IS - 3

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