Abstract
Measurements of the 3° K cosmic blackbody radiation at frequencies below about 1 GHz have a limited accuracy because radiation from the Galaxy becomes a dominant component. Measurements at 408 MHz and 610 MHz nevertheless show that there is a radiation component at these frequencies which is consistent with a blackbody spectrum of about 3° K.
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HOWELL, T., SHAKESHAFT, J. Spectrum of the 3° K Cosmic Microwave Radiation. Nature 216, 753–754 (1967). https://doi.org/10.1038/216753a0
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DOI: https://doi.org/10.1038/216753a0
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