Hostname: page-component-77c89778f8-sh8wx Total loading time: 0 Render date: 2024-07-16T11:22:29.640Z Has data issue: false hasContentIssue false

Very High Energy Gamma-ray Observations of AGN with CANGAROO

Published online by Cambridge University Press:  05 March 2013

Kyoshi Nishijima*
Affiliation:
Department of Physics, Tokai University, 1117 Kita-Kaname, Hiratsuka, Kanagawa, Japan, 259-1292; kyoshi@tkikam.sp.u-tokai.ac.jp
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

We have observed eight AGN since 1993 in the energy region above several hundred GeV using the CANGAROO telescopes. We observed Mrk 421 for ten nights with the CANGAROO-II 10 m telescope during its active state in early 2001 using the very large zenith angle technique. Our preliminary result implies the detection of gamma-ray emission from Mrk 421 in the energy range above 9.3 TeV. The high energy peaked BL Lacs (HBLs) PKS 2005–489 and PKS 2155–304 have been also observed. No statistically significant signals are found for both HBLs and flux upper limits are obtained. A summary of results of observations of AGN is presented in this paper.

Type
Research Article
Copyright
Copyright © Astronomical Society of Australia 2002

References

Catanese, M., & Weekes, T. C. 1999, PASP, 111, 1193 Google Scholar
Chadwick, P. M., et al. 1999a, ApJ, 513, 161 Google Scholar
Chadwick, P. M., et al. 1999b, Proc. 26th ICRC (Salt Lake City), 3, 338 Google Scholar
Chadwick, P. M., et al. 2000, A&A, 364, 450 Google Scholar
Kajino, F., et al. 1999, Proc. 26th ICRC (Salt Lake City), 3, 370 Google Scholar
Kubo, H., Takahashi, T., Madejski, G., Tashiro, M., Makino, F., Inoue, S., & Takahara, F. 1998, ApJ, 504, 693 Google Scholar
Mori, M., et al. 2001, Proc. 27th ICRC (Hamburg), OG231Google Scholar
Neshpor, Y. I., Stepanyan, A. A., Kalekin, O. P., Fomin, V. P., Chalenko, N. N., & Shitov, V. G. 1998, Astron. Letts., 24, 134 Google Scholar
Okumura, K., et al. 2001, Proc. 27th ICRC (Hamburg), OG202Google Scholar
Punch, M., et al. 1992, Nature, 358, 477 Google Scholar
Quinn, J., et al. 1996, ApJ, 456, L83 Google Scholar
Roberts, M. D., et al. 1998a, A&A, 337, 25 Google Scholar
Roberts, M. D., et al. 1998b, A&A, 343, 691 Google Scholar
Rowell, G. P., et al. 1999, Astropart. Phys., 11, 217 Google Scholar
Sambruna, R. M., Maraschi, L., & Urry, C. M. 1996, ApJ, 463, 444 Google Scholar
Sommers, P., & Elbert, J. W. 1987, J. Phys. G: Nucl. Phys., 13, 553 Google Scholar
Stecker, F. W., de Jager, O. C., & Salamon, M. H. 1996, ApJ, 473, L75 Google Scholar
Ulrich, M.-H., Maraschi, L., & Urry, C. M. 1997, ARA&A, 35, 445 Google Scholar