Early results from the Cosmic Background Explorer (COBE)

J. C. Mather*, M. G. Hauser, C. L. Bennett, N. W. Boggess, E. S. Cheng, Eplee R.E. Jr., H. T. Freudenreich, R. B. Isaacman, T. Kelsall, C. M. Lisse, Moseley S.H. Jr., R. A. Shafer, R. F. Silverberg, W. J. Spiesman, G. N. Toller, J. L. Weiland, S. Gulkis, M. Jansssen, P. M. Lubin, S. S. MeyerR. Weiss, T. L. Murdock, G. F. Smoot, D. T. Wilkinson, E. L. Wright

*Corresponding author for this work

Research output: Contribution to journalJournal Articlepeer-review

11 Citations (Scopus)

Abstract

The Cosmic Background Explorer, launched November 18, 1989, has nearly completed its first full mapping of the sky with all three of its instruments: a Far Infrared Absolute Spectrophotometer (FIRAS) covering 0.1 to 10 mm, a set of Differential muwave Radiometers (DMR) operating at 3.3, 5.7, and 9.6 mm, and a Diffuse Infrared Background Experiment (DIRBE) spanning 1 to 300 μm in ten bands. A preliminary map of the sky derived from DIRBE data is presented. Initial cosmological implications include: a limit on the Comptonization y parameter of 10-3, on the chemical potential μ parameter of 10-2, a strong limit on the existence of a hot smooth intergalactic medium, and a confirmation that the dipole anisotropy has the spectrum expected from a Doppler shift of a blackbody. There are no significant anisotropies in the muwave sky detected, other than from our own galaxy and a cos θ dipole anisotropy whose amplitude and direction agree with previous data. At shorter wavelengths, the sky spectrum and anisotropies.

Original languageEnglish
Pages (from-to)181-191
Number of pages11
JournalAdvances in Space Research
Volume11
Issue number2
DOIs
Publication statusPublished - 1991
Externally publishedYes

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