The Cosmic Microwave Background Spectrum from the Full COBE/FIRAS Data Set

Details The Cosmic Microwave Background Spectrum from the Full COBE/FIRAS Data Set The Cosmic Microwave Background Spectrum from the Full COBE/FIRAS Data Set

1996-05-10

arxiv.org/abs/astro-ph/9605054v1

Astrophys.J. 473 (1996) 576

Astronomy and Astrophysics

Astrophysics

32 pages, LaTeX+aasms package, 6 figures as separate PostScript file. Submitted to Ap.J

Scientific paper

10.1086/178173

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 CMBR. For the Comptonization and chemical potential we find $|y| < 15\times10^{-6}$ and $|\mu| < 9\times10^{-5}$ (95\% CL). There are also refinements in the absolute temperature, 2.728 $\pm$ 0.004 K (95\% CL), and dipole direction, $(\ell,b)=(264.14^\circ\pm0.30, 48.26^\circ\pm0.30)$ (95\% CL), and amplitude, $3.372 \pm 0.007$ mK (95\% CL). All of these results agree with our previous publications.

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