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Type: Journal article
Title: TeV gamma-ray observations of three southern BL Lacs with the CANGAROO 3.8m Imaging Telescope
Author: Roberts, M.
Dazeley, S.
Edwards, P.
Hara, T.
Hayami, Y.
Holder, J.
Kakimoto, F.
Kamei, S.
Kawachi, A.
Kifune, T.
Kita, R.
Konishi, T.
Masaike, A.
Matsubara, Y.
Matsuoka, T.
Mizumoto, Y.
Mori, M.
Muraishi, H.
Muraki, Y.
Nishijima, K.
et al.
Citation: Astronomy and Astrophysics: a European journal, 1998; 337(1):25-30
Issue Date: 1998
ISSN: 0004-6361
Statement of
M.D. Roberts, S.A. Dazeley, P.G. Edwards, T. Hara, Y. Hayami ... Gavin P. Rowell ... et al.
Abstract: 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, EXO0423.4−0840, PKS2005−489 and PKS2316−423) made between 1993 and 1996 with the CANGAROO 3.8m imaging Cˇ erenkov 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.
Keywords: gamma-rays: observations – BL Lacertae objects: individual: PKS0521−365, EXO0423.4−0840, PKS2005−489, PKS2316−423
Rights: © 1998 EDP SCIENCES S A
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