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COBE

Cosmic Background Explorer/FIRAS

Product Name
Destriped Sky Spectra (Spectral Sky Maps)
Mission
COBE/FIRAS

Description

There are three main Spectral Sky Maps: two low-spectral resolution products (FIRAS_DESTRIPED_SKY_SPECTRA_LOWF.FITS, and FIRAS_DESTRIPED_SKY_SPECTRA_HIGH.FITS), which cover the full FIRAS frequency range at 13.6041 GHz resolution; and a high-spectral resolution product called FIRAS_DESTRIPED_SKY_SPECTRA_HRES.FITS, which covers the frequency range 30 - 660 GHz at 6.9 GHz resolution. These files contain a spectrum at each pixel and were created by coadding spectra obtained from various FIRAS channel and scan mode combinations. Prior to coaddition, the observations made in different modes were calibrated to remove the instrument signature. "Destriping" is a secondary calibration step applied to compensate for unidentified instrumental offsets. The existence of such offsets is suggested by stripes that appear in an untreated sky map at a particular frequency.

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A service of the HEASARC and of the Astrophysics Science Division at NASA/GSFC
Goddard Space Flight Center, National Aeronautics and Space Administration
HEASARC Director: Dr. Alan P. Smale
LAMBDA Director: Dr. Eric R. Switzer
NASA Official: Dr. Eric R. Switzer
Web Curator: Mr. Michael R. Greason