Astronomy and Astrophysics – Astrophysics – Instrumentation and Methods for Astrophysics
Scientific paper
2009-01-05
Astrophys.J.730:138,2011
Astronomy and Astrophysics
Astrophysics
Instrumentation and Methods for Astrophysics
12 pages, 14 figues, 3 tables, 2 figures added, Accepted to ApJ
Scientific paper
10.1088/0004-637X/730/2/138
The second generation Absolute Radiometer for Cosmology, Astrophysics, and Diffuse Emission (ARCADE 2) instrument is a balloon-borne experiment to measure the radiometric temperature of the cosmic microwave background and Galactic and extra-Galactic emission at six frequencies from 3 to 90 GHz. ARCADE 2 utilizes a double-nulled design where emission from the sky is compared to that from an external cryogenic full-aperture blackbody calibrator by cryogenic switching radiometers containing internal blackbody reference loads. In order to further minimize sources of systematic error, ARCADE 2 features a cold fully open aperture with all radiometrically active components maintained at near 2.7 K without windows or other warm objects, achieved through a novel thermal design. We discuss the design and performance of the ARCADE 2 instrument in its 2005 and 2006 flights.
Fixsen Dale J.
Kogut Alan
Levin Sergey
Limon Michele
Lubin Philip
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