TeV gamma-ray observations of southern BL Lacs with the CANGAROO 3.8m Imaging Telescope

Details TeV gamma-ray observations of southern BL Lacs with the CANGAROO 3.8m Imaging Telescope TeV gamma-ray observations of southern BL Lacs with the CANGAROO 3.8m Imaging Telescope

1998-11-17

arxiv.org/abs/astro-ph/9811260v1

Astron.Astrophys.337:25-30,1998

Astronomy and Astrophysics

Astrophysics

6 pages including 2 figures

Scientific paper

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 Cherenkov telescope. During the period of these observations the gamma-ray energy threshold of the 3.8m telescope was ~2TeV. Searches for steady long-term emission have been made, and, inspired by the TeV flares detected from Mkn421 and Mkn501, 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.

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