TeV gamma-ray observations of southern BL lacs with the CANGAROO 3.8m Imaging telescope

M. D. Roberts, S. A. Dazeley, P. G. Edwards, T. Hara, Y. Hayami, J. Holder, F. Kakimoto, S. Kamei, A. Kawachi, T. Kifune, R. Kita, T. Konishi, A. Masaike, Y. Matsubara, T. Matsuoka, Y. Mizumoto, M. Mori, H. Muraishi, Y. Muraki, K. NishijimaS. Oda, S. Ogio, J. R. Patterson, G. P. Rowell, T. Sako, K. Sakurazawa, R. Susukita, A. Suzuki, R. Suzuki, T. Tamura, T. Tanimori, G. J. Thornton, S. Yanagita, T. Yoshida, T. Yoshikoshi

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


Observational and theoretical results indicate that low-redshift BL Lacertae objects are the most likely extragalactic sources to be detectable at TeV energies. In this paper we present the results of observations of 4 BL Lacertae objects (PKS0521-365, EXO 0423.4-0840, PKS2005-489 and PKS2316-423) made between 1993 and 1996 with the CANGAROO 3.8 m imaging Čerenkov telescope. During the period of these observations the gamma-ray energy threshold of the 3.8m telescope was ∼2 TeV. Searches for steady long-term emission have been made, and, inspired by the TeV flares detected from Mkn 421 and Mkn 501, a search on a night-by-night timescale has also been performed for each source. Comprehensive Monte Carlo simulations are used to estimate upper limits for both steady and short timescale emission.

Original languageEnglish
Pages (from-to)25-30
Number of pages6
JournalAstronomy and Astrophysics
Issue number1
Publication statusPublished - Sept 1 1998
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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