Cosmic Background Explorer/FIRAS

Product Name
Covariance Matrix


The Covariance Matrices express all frequency-to-frequency variances in the calibrated spectra, including correlation effects induced by apodization prior to taking the Fourier transform, in units of (MJ/sr)^2. Covariances with instrument characteristics such as calibration source temperatures are included as well. For a full discussion, see the FIRAS Explanatory Supplement (especially subsection 7.1.2). 6 FITS files are available, corresponding to the FIRAS modes HRES, HIGH, LOWF and HIF(3 files). FITS headers are listed in the FIRAS Explanatory Supplement Appendix G.

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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