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Early results from the Far Infrared Absolute Spectrophotometer (FIRAS)The Far Infrared Absolute Spectrophotometer (FIRAS) on the Cosmic Background Explorer (COBE) mapped 98 percent of the sky, 60 percent of it twice, before the liquid helium coolant was exhausted. The FIRAS covers the frequency region from 1 to 100/cm with a 7 deg angular resolution. The spectral resolution is 0.2/cm for frequencies less than 20/cm and 0.8/cm for higher frequencies. Preliminary results include: a limit on the deviations from a Planck curve of 1 percent of the peak brightness from 1 to 20/cm, a temperature of 2.735 +/- 0.06 K, a limit on the Comptonization parameter y of 0.001, on the chemical potential parameter mu of 0.01, a strong limit on the existence of a hot smooth intergalactic medium, and a confirmation that the dipole anisotropy spectrum is that of a Doppler shifted blackbody.
Document ID
19930039611
Document Type
Conference Paper
Authors
Mather, J. C. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Cheng, E. S. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Shafer, R. A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Eplee, R. E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Isaacman, R. B. (General Sciences Corp. Laurel, MD, United States)
Fixsen, D. J. (Univ. Space Research Association Greenbelt, MD, United States)
Read, S. M. (STX Corp. Lanham, MD, United States)
Meyer, S. S. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Weiss, R. (MIT Cambridge, MA, United States)
Wright, E. L. (California Univ. Los Angeles, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1991
Publication Information
Publication: In: After the first three minutes; Proceedings of the 1st Astrophysics Workshop, Univ. of Maryland, College Park, Oct. 15-17, 1990 (A93-23605 07-90)
Subject Category
SPACECRAFT INSTRUMENTATION
Distribution Limits
Public
Copyright
Other