Early results from the Far Infrared Absolute Spectrophotometer (FIRAS)

Details Early results from the Far Infrared Absolute Spectrophotometer (FIRAS) Early results from the Far Infrared Absolute Spectrophotometer (FIRAS)

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aipc..222...43m&link_type=abstract

In: After the first three minutes; Proceedings of the 1st Astrophysics Workshop, Univ. of Maryland, College Park, Oct. 15-17, 19

Astronomy and Astrophysics

Astronomy

6

Cosmic Background Explorer Satellite, Far Infrared Radiation, Infrared Spectrometers, Relic Radiation, Satellite Instruments, Spaceborne Astronomy, Astronomical Spectroscopy, Big Bang Cosmology, Error Analysis, Interferometers, Sky Surveys (Astronomy)

Scientific paper

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.

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