Physics – Optics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.1112m&link_type=abstract
American Astronomical Society, AAS Meeting #211, #11.12; Bulletin of the American Astronomical Society, Vol. 39, p.746
Physics
Optics
Scientific paper
The FourStar infrared camera is a 1.0-2.5 μm (JHKs) near infrared camera for the Magellan Baade 6.5 m Telescope at Las Campanas Observatory (Chile). It is being built by Carnegie Observatories for use by the Magellan Consortium and is scheduled for completion in June 2009. The instrument uses four Rockwell HAWAII-2RG 2048 X 2048 imaging arrays in a close-packed arrangement for a 4096 X 4096 pixel imaging area. The field size is 10.9' X 10.9' with a 0.16 arcsec/pixel scale. The survey power, in terms of A-Ω (telescope aperture times field), will be the largest of any southern hemisphere imager. FourStar will be mounted at a Magellan telescope Nasmyth focus. Fed by the f/11 telescope beam, cryogenically cooled optics reduce this to F/3.6 providing the desired field and pixel sampling. The optics comprise a seven element, three group system with one aspheric surface. Two filter wheels accomodate ten filters. The readout electronics are provided by Teledyne-supplied Application Specific Integrated Circuits (ASIC's) cooled to LN2 temperatures. The imaging arrays present themselves as USB 2.0 devices to our data system. A network of eleven computers implement control and reduce data reduction functions. An online data pipeline will produce fully reduced and calibrated images at the telescope. The outstanding seeing at Las Campanas site, coupled with the high sensitivity and large field of view of FourStar will enable a range of survey and targeted science programs. These include surveys of massive red galaxies at z > 2, surveys of galaxy clusters at z > 1, near-IR follow-up of Spitzer legacy fields, and surveys of T and L brown dwarfs using both intermediate-band methane and broad-band filters. FourStar funding has been provided by the National Science Foundation and the Carnegie Institution of Washington.
Barkhouser Robert
Hammond Richard
Kelson Daniel
Marshall James J.
McCarthy Patrick
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