Other
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983liaco..24...43l&link_type=abstract
IN: Quasars and gravitational lenses; Proceedings of the Twenty-fourth Liege International Astrophysical Colloquium, Cointe-Ougr
Other
Astronomical Photography, Astronomical Spectroscopy, Electronography, Gravitational Lenses, Quasars, Spectrographs, Cameras, Gratings (Spectra), Lens Design, Spectrophotometry
Scientific paper
A valve electronographic camera with grenses and a prime focus bonnette for the detection of quasars is described. The camera is installed at the joint Canada-France-Hawaii-Telescope (CFHT) and can produce images over a field of one degree. The optical characteristics of the instrument are described, and some advantages over other conventional cameras are discussed. The instrument was tested during observations of stellar objects with unusual spectral characteristics in the magnitude range from 21 to 23. Some of the problems of eliminating classical objects with strong emission lines from the recognized QSOs in the sample are described. A series of microdensitometer recordings of several spectra obtained with the CFHT grens and the electronographic camera are provided. The spectra show two new possible double quasar candidates.
Fort Bernard
Lelievre Gerard
Mathez Guy
Nottale Laurent
Picat Jean-Pierre
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