FIRAS Line Emission Maps

COBE sky maps are generated using the Quad-Cube pixelization scheme; the first file listed below contains data in that native format. For the convenience of user that do not require the capabilities that Quad-Cube offers, we also provide the maps in a Mollweide projection. These reprojected maps may be displayed using standard astronomical display software such as DS9 and SAOImage.

Please note that the reprojection process typically oversamples the pixels; there will be some data replication in the image data. As a result, care must be taken when using the image data in a regime where the noise properties are important since the statistical weight per pixel will also be replicated. Finally, the original datasets contain data quality flags for each pixel; this layer of information is not conveyed into the reprojection. Therefore, it is strongly recommended that the original data sets be used for any statistical analysis.

Recommended download procedure for '.fits' or '.tar.gz' files:
right click on the file name and save. For more information on the use of Dataset IDs,
see the LAMBDA Products Overview.

FIRAS Line Emission Maps
Dataset Id
File Info
File Name
Delivery Date
High Frequency, Low Spectral Resolution, 600-2880 GHz
940 KB
High Resolution, 30-660 GHz
664 KB
Low Frequency, Low Spectral Resolution, 60-630 GHz
675 KB

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