Dale J. Fixsen studies precision measurements of the cosmic microwave background. He led an analysis of FIRAS data from COBE that compared the sky signal with a precise blackbody spectrum, constraining departures from that spectral shape.[ref]
The Cosmic Microwave Background Spectrum from the Full COBE/FIRAS Data Set by Dale J. Fixsen and others. Abstract: differential blackbody comparison and limits on spectral deviations
His 2009 study independently recalibrated FIRAS using WMAP and combined published measurements of the background temperature. It distinguishes the temperature from that recalibration from the value obtained by combining the literature: . The distinction makes the origin of an extremely precise quoted number traceable.[ref]
The Temperature of the Cosmic Microwave Background by Dale J. Fixsen. Abstract: independent recalibration and literature-combined temperature
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