Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-02-24
Astrophys.J. 612 (2004) 86-95
Astronomy and Astrophysics
Astrophysics
8 pages including 5 figures. Submitted to The Astrophysical Journal
Scientific paper
10.1086/421993
We report the results of an effort to measure the low frequency portion of the spectrum of the Cosmic Microwave Background Radiation (CMB), using a balloon-borne instrument called ARCADE (Absolute Radiometer for Cosmology, Astrophysics, and Diffuse Emission). These measurements are to search for deviations from a thermal spectrum that are expected to exist in the CMB due to various processes in the early universe. The radiometric temperature was measured at 10 and 30 GHz using a cryogenic open-aperture instrument with no emissive windows. An external blackbody calibrator provides an in situ reference. A linear model is used to compare the radiometer output to a set of thermometers on the instrument. The unmodeled residuals are less than 50 mK peak-to-peak with a weighted RMS of 6 mK. Small corrections are made for the residual emission from the flight train, atmosphere, and foreground Galactic emission. The measured radiometric temperature of the CMB is 2.721 +/- 0.010 K at 10 GHz and 2.694 +/- 0.032 K at 30 GHz.
Fixsen Dale J.
Kogut Alan
Levin Sergey
Limon Michele
Lubin Philip
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