Astron. Astrophys. 364, 450-454 (2000)

TeV observations of PKS 2005-489 and PKS 0548-322

P.M. Chadwick, M.K. Daniel, K. Lyons, T.J.L. McComb, J.M. McKenny, S.J. Nolan, K.J. Orford, J.L. Osborne, S.M. Rayner and K.E. Turver

University of Durham, Department of Physics, Rochester Building, Science Laboratories, Durham, DH1 3LE, UK

Received 22 May 2000 / Accepted 23 October 2000

Abstract

Observations have been made using the University of Durham Mark 6 telescope of the nearby X-ray selected BL Lacs PKS 2005-489 and PKS 0548-322 which should be strong candidates as sources of TeV emission. We find no evidence for long-term emission of VHE gamma rays from these sources in extended measurements covering years. We find limits to the VHE gamma ray flux of above 400 GeV for PKS 2005-489 and above 300 GeV for PKS 0548-322.

Key words: galaxies: BL Lacertae objects: general gamma rays: observations

Send offprint requests to: T.J.L. McComb (t.j.l.mccomb @dur.ac.uk)

Correspondence to: T.J.L. McComb, Department of Physics, Rochester Building, Science Laboratories, University of Durham, Durham, DH1 3LE, UK

SIMBAD Objects

Contents

• 1. Introduction
• 2. Observations
• 3. Results
  • 3.1. Limits on longterm emission
  • 3.2. Search for short bursts
  • 3.3. The November 1998 PKS 2005-489 X-ray flare
• 4. Discussion
• 5. Conclusions
• Acknowledgements
• Appendices
  • A: observing log
• References

© European Southern Observatory (ESO) 2000

Online publication: January 29, 2001
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