The Temperature of the CMB at 10 GHz

Abstract

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.

arXiv comment8 pages including 5 figures. Submitted to The Astrophysical Journal

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• Imprint of Intergalactic Shocks on the Radio Sky
• The Spectrum of the Universe
• ARCADE 2 Observations of Galactic Radio Emission
• Does Bose-Einstein condensation of CMB photons cancel μ distortions created by dissipation of sound waves in the early Universe?
• The ARCADE 2 Instrument
• TRIS II: search for CMB spectral distortions at 0.60, 0.82 and 2.5 GHz
• Galactic Center Radio Constraints on Gamma-Ray Lines from Dark Matter Annihilation
• ARCADE: Absolute Radiometer for Cosmology, Astrophysics, and Diffuse Emission
• An Instrument to Measure the Temperature of the Cosmic Microwave Background Radiation at Centimeter Wavelengths
• The cosmological free-free signal from galaxy groups and clusters
• Design and Calibration of a Cryogenic Blackbody Calibrator at Centimeter Wavelengths
• Spectral Spatial Fluctuations of CMBR: Strategy and Concept of the Experiment
• Constraining gravitational-wave backgrounds from conversions into photons in the Galactic magnetic field