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Title:
The Cosmic Microwave Background Spectrum from the Full COBE FIRAS Data Set
Authors:
Fixsen, D. J.; Cheng, E. S.; Gales, J. M.; Mather, J. C.; Shafer, R. A.; Wright, E. L.
Publication:
Astrophysical Journal v.473, p.576 (ApJ Homepage)
Publication Date:
12/1996
Origin:
APJ
Astronomy Keywords:
COSMOLOGY: COSMIC MICROWAVE BACKGROUND, COSMOLOGY: OBSERVATIONS
DOI:
10.1086/178173
Bibliographic Code:
1996ApJ...473..576F

Abstract

We have refined the analysis of the data from the FIRAS (Far-InfraRed Absolute Spectrophotometer) on board the COBE (COsmic Background Explorer). The FIRAS measures the difference between the cosmic microwave background and a precise blackbody spectrum. We find new, tighter upper limits on general deviations from a blackbody spectrum. The rms deviations are less than 50 parts per million of the peak of the cosmic microwave background radiation. For the Comptonization and chemical potential, we find |y| <15 x 10-6 and |μ| <9 x 10-5 (95% confidence level [CL]). There are also refinements in the absolute temperature, 2.728±0.004 K (95% CL), the dipole direction, (l, b) = (264°.14 + 030 48°.26±0.30) (95% CL), and the amplitude, 3.372 + 0.014 mK (95% CL). All of these results agree with our previous publications.

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