Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pasp..114.1043g&link_type=abstract
The Publications of the Astronomical Society of the Pacific, Volume 114, Issue 799, pp. 1043-1050.
Astronomy and Astrophysics
Astronomy
39
Galaxies: Kinematics And Dynamics, Instrumentation: Detectors, Instrumentation: Spectrographs
Scientific paper
A third-generation image photon-counting system (IPCS) camera is presented, based on a GaAs photocathode that can achieve a quantum efficiency of up to 23%, which is comparable to a thick CCD but without readout noise. This system is 10 times more sensitive at Hα than previous photon-counting cameras. In terms of signal-to-noise ratio, the system outperforms CCDs for extremely faint fluxes, including antireflection-coated, low-noise, thin CCDs. This system, with up to 1K×1K pixels, is one of the largest monolithic IPCSs. A unique cooling system, based on a Ranque-Hilsh vortex tube, is used for this camera. Real-time centering is done by a scalable digital signal processor board. Astrophysical projects and preliminary results obtained with this new camera coupled with a scanning Fabry-Pérot interferometer at the Cassegrain focus of the 3.6 m ESO telescope, the 1.93 m Observatoire de Haute Provence telescope, and the 1.6 m Observatoire du Mont Mégantic telescope are presented.
Amram Ph.
Boissin Olivier
Boulesteix Jacques
Carignan Claude
Gach Jean-Luc
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