The Cosmic Microwave Background Spectrum from the FullCOBEFIRAS Data Set

1996/05/10 by D. J. Fixsen, E. S. Cheng, J. M. Gales +5 · 47 citations
Physics and Astronomy · #Astrophysics #Astrophysics and Cosmic Phenomena #Background radiation #Black-body radiation #Cosmic background radiation #Cosmic microwave background #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Microwave #Nuclear physics #Optics #Physics #Radiation #astro-ph

paper · pdf · doi:10.1086/178173

published as Astrophys.J. 473 (1996) 576 · 32 pages, LaTeX+aasms package, 6 figures as separate PostScript file. Submitted to Ap.J

arxiv created 1996/05/10 · openalex publication_date 1996/12/20 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

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 × 10 –6 and |μ| < 9 × 10 –5 (95% confidence level [CL]). There are also refinements in the absolute temperature, 2.728 ± 0.004 K (95% CL), the dipole direction, (1, b )/(264 14 ± 0.30, 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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