The Far Infrared Absolute Spectrophotometer (FIRAS): Cosmic Background Spectrum, Dipole and Distortions

Details The Far Infrared Absolute Spectrophotometer (FIRAS): Cosmic Background Spectrum, Dipole and Distortions The Far Infrared Absolute Spectrophotometer (FIRAS): Cosmic Background Spectrum, Dipole and Distortions

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.1807f&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #18.07; Bulletin of the American Astronomical Society, Vol. 24, p.1149

Astronomy and Astrophysics

Astrophysics

Scientific paper

The FIRAS (Far Infrared Absolute Spectrophotometer) instrument on the COBE(dag ) is designed to measure differences between the cosmic microwave background spectrum and the theoretically predicted blackbody spectrum. This paper reports details of the calibration and analysis methods used to achieve accuracy and precision of better than 0.05% of the peak brightness from 2 to 20 cm(-1) . The calibration is done by least squares fitting of an instrument model to observations of the calibration blackbodies and horn antennas at a wide variety of temperatures. The model includes the bolometer detectors, the emissivities of the IR sources, and error parameters for vibrations, thermometer noise and calibration, and multipass radiation. The analysis of the sky includes fits to a uniform (CBR), dipole, and an average galactic spectrum. The fits, residuals, and error estimates leading to these spectra will be shown, and the spectra will be compared with predictions and the y and mu distortion. Limits for mu and y will be reported along with the best values and their errors for the CBR temperature, the dipole amplitude, the dipole color temperature, and an estimate for the galactic radiation at the galactic poles. () COBE is supported by NASA's Astrophysics Division. Goddard Space Flight Center (GSFC), under the scientific guidance of the COBE Science Working Group, is responsible for the development and operation of COBE.

Affiliated with

Also associated with

No associations

Rating

The Far Infrared Absolute Spectrophotometer (FIRAS): Cosmic Background Spectrum, Dipole and Distortions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Far Infrared Absolute Spectrophotometer (FIRAS): Cosmic Background Spectrum, Dipole and Distortions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Far Infrared Absolute Spectrophotometer (FIRAS): Cosmic Background Spectrum, Dipole and Distortions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1110301