Construction of Wide Field Cryogenic Telescope

Details Construction of Wide Field Cryogenic Telescope Construction of Wide Field Cryogenic Telescope

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002exa....13..119a&link_type=abstract

Experimental Astronomy, v. 13, Issue 3, p. 119-134 (2002).

Astronomy and Astrophysics

Astronomy

2

Background, Infrared, Wide Field Imaging

Scientific paper

We constructed a wide field cryogenic telescope (WFCT) containing a whole Ritchey-Chrétien system and a focalplane array in a cryostat for near infrared observations to cover the field of view of 0.4°.The telescope has a primary mirror of 220 mm and anengineering grade 256 × 256 InSb array.The optical components such as two mirrors, filters, spiders,and radiation shield tube are cooled down to 180 K as well asthe InSb array to 35 K by a mechanical refrigerator.We show the results of the background surface brightnesses andthe limiting magnitudes at 3.3 and 3.67 μm measured atSutherland, South Africa.We describe the on-going upgrade of this instrument, equippedwith a 1024 × 1024 ALADDIN InSb science grade array.

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