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Foreground Data

Haslam 408 MHz

The sky maps are generated using the HEALPix sky pixelization scheme. The first file listed for each map contains the data in its native HEALPix format. For the convenience of users who do not require the capabilities that HEALPix offers, we also provide the maps in two projected image formats: Mollweide and Zenith Equal Area (ZEA). These files contain the string "_mollweide" and "_zea" respectively, and may be displayed with standard astronomical display software such as DS9 and SAOImage. Note that the image pixels typically over-sample the HEALPix pixels, thus some amount of data replication will be present 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.

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.

Haslam 408 MHz
Description
File Info
File Name
Haslam 408 MHz with filtering and strong sources removed 25 MB
FITS Hdr
lambda_haslam408_dsds.fits
lambda_mollweide_haslam408_dsds.fits
lambda_zea_haslam408_dsds.fits
Haslam 408 MHz with no filtering 25MB
FITS Hdr
lambda_haslam408_nofilt.fits
lambda_mollweide_haslam408_nofilt.fits
lambda_zea_haslam408_nofilt.fits

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