Adelaide Research & Scholarship
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https://hdl.handle.net/2440/50834
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| Type: | Journal article |
| Title: | Cangaroo-III observations of the 2006 outburst of PKS 2155-304 |
| Author: | Sakamoto, Y. Nishijima, K. Mizukami, T. Yamazaki, E. Kushida, J. Enomoto, R. Ohishi, M. Bicknell, G. Clay, R. Edwards, P. Gunji, S. Hara, S. Hattori, T. Hayashi, S. Higashi, Y. Hirai, Y. Inoue, K. Itoh, C. Kabuki, S. Kajino, F. et al. |
| Citation: | The Astrophysical Journal: an international review of astronomy and astronomical physics, 2008; 676(1):113-120 |
| Publisher: | Univ Chicago Press |
| Issue Date: | 2008 |
| ISSN: | 0004-637X 1538-4357 |
| Statement of Responsibility: | Y. Sakamoto, K. Nishijima, T. Mizukami, E. Yamazaki, J. Kushida, R. Enomoto, M. Ohishi, G. V. Bicknell, R. W. Clay, P. G. Edwards, S. Gunji, S. Hara, T. Hattori, S. Hayashi, Y. Higashi, Y. Hirai, K. Inoue, C. Itoh, S. Kabuki, F. Kajino, H. Katagiri, A. Kawachi, T. Kifune, R. Kiuchi, H. Kubo, R. Mizuniwa, M. Mori, H. Muraishi, T. Naito, T. Nakamori, S. Nakano, D. Nishida, A. Seki, V. Stamatescu, T. Suzuki, D. L. Swaby, T. Tanimori, G. Thornton, F. Tokanai, K. Tsuchiya, S. Watanabe, Y. Yamada, S. Yanagita, T. Yoshida, T. Yoshikoshi, and Y. Yukawa |
| Abstract: | We have used the CANGAROO-III imaging atmospheric Cerenkov telescopes to observe the high-frequency-peaked BL Lacertae (HBL) object PKS 2155-304 between 2006 July 28 (MJD 53,944) and August 2, triggered by the H.E.S.S. report that the source was in a high state of TeV gamma-ray emission. A signal was detected at the 4.8 σ level in an effective live time of 25.1 hr during the outburst period. The flux of very high energy gamma rays from the CANGAROO-III observations shows variability on the timescale of less than a few hours. The averaged integral flux above 660 GeV is (1.6 ± 0.3stat ± 0.5syst) × 10-11 cm-2 s -1, which corresponds to ∼45% of the flux observed from the Crab Nebula. Follow-up observations between August 17 (MJD 53,964) and 25 indicate that the source activity had decreased. © 2008. The American Astronomical Society. All rights reserved. |
| Keywords: | BL Lacertae objects: individual (PKS 2155–304) galaxies: active gamma rays: observations |
| Description: | Copyright © 2008. The American Astronomical Society. All rights reserved. Printed in U.S.A. |
| Provenance: | The Astrophysical Journal (0004-637X) was published by the University of Chicago Press previous to 2009. |
| DOI: | 10.1086/528369 |
| Published version: | http://dx.doi.org/10.1086/528369 |
| Appears in Collections: | Aurora harvest Chemistry and Physics publications |
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