The Temperature of the Cosmic Microwave Background at 10 GHz
| Autor: | M. D. Seiffert, D. J. Fixsen, P. Lubin, S. Levin, Edward J. Wollack, Michele Limon, A. Kogut, Paul Mirel |
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| Rok vydání: | 2004 |
| Předmět: |
Physics
Radiometer media_common.quotation_subject Cosmic microwave background Astrophysics::Instrumentation and Methods for Astrophysics Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Low frequency Universe Cosmology Atmosphere Space and Planetary Science Thermal radiation Black-body radiation Astrophysics::Galaxy Astrophysics media_common |
| Zdroj: | The Astrophysical Journal. 612:86-95 |
| ISSN: | 1538-4357 0004-637X |
| DOI: | 10.1086/421993 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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