Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993vheg.rept.....l&link_type=abstract
Unknown
Astronomy and Astrophysics
Astrophysics
Active Galactic Nuclei, Astrophysics, Crab Nebula, Gamma Ray Astronomy, Gamma Ray Telescopes, Markarian Galaxies, Cameras, Energy Spectra, Gamma Ray Observatory, Reflectors
Scientific paper
The Crab-Nebula continues to be the 'standard candle' of TeV gamma-ray astronomy. The Whipple Collaboration's observations of it are now confirmed by two French groups. Application of the 'supercuts' technique, developed on the Crab database, has resulted in the observation of a distant, active galaxy, Markarian 421. Markarian 421 is one of 16 active galactic nuclei (AGN's) observed by the EGRET instrument on the Compton Gamma Ray Observatory. The EGRET observations and the expected attenuation of TeV photons from very distant AGN's gives added impetus to efforts in upgrading the present steoscopic detection system. The upgrade not only improves the sensitivity of the twin telescopes, but also reduces the energy threshold to 100 GeV, at which energy attenuation effects for distant sources are greatly reduced. During the past year the llm reflector was operated as a 37-pixel camera, with its performance matching design expectations. During the coming year, its camera will be upgraded to 109 pixels, the 10m camera electronics made to conform to the llm electronics, and both systems interfaced to a single, faster computer. Observations of Markarian 421, simultaneous with EGRET, are scheduled for May, 1993.
Lamb Richard C.
Lewis Aaron D.
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