The ESA PCD at the 2.2 m telescope

Details The ESA PCD at the 2.2 m telescope The ESA PCD at the 2.2 m telescope

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985msngr..41....2d&link_type=abstract

ESO Messenger (ISSN 0722-6691), no. 41, Sept. 1985, p. 2-6.

Astronomy and Astrophysics

Astronomy

3

Astronomical Observatories, Imaging Techniques, Optical Measuring Instruments, Photons, Astronomical Spectroscopy, Data Reduction, Image Intensifiers, Telescopes

Scientific paper

The Photon Counting Detector (PCD) has been used at the European Southern Observatory with the 2.2 m telescope since 1984 and furnishes data expedted to be similar to its follow-up, the Faint Object Camera on the Space Telescope. The PCD consists of a three-stage image intensifier with magnetic focusing and a bialkali prime photocathode. The system is coupled by a reimaging lens to a television tube which detects scintillations at the intensifier output. The positions of the scintillations are recorded in Cartesian coordinates to build an image of the light striking the detector. The front end has been fitted with a dioptric camera for operation with a spectrograph. The sensitivity covers the range 3400-6800 A at a scale factor of 1 arcsec/22 microns in a field 25 mm across. Spectroscopy is carried out at an image size of 1024 x 256 pixels in standard format, and 512 x 512 pixels in narrow band. Sample data at various levels of processing are provided for forbidden O III spectra for the galaxy PKS 0349-27.

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