Foreground

The 408 MHz radio continuum all-sky map of Haslam et al. (see references below) combines data from four different surveys. The map is dominated by synchrotron emission.

Two versions of the map are supplied:

• The destriped/desourced (dsds) version was constructed from survey data obtained from the archives of the NCSA ADIL in galactic coordinates. The data were then transformed to a celestial coordinate grid and subsequently processed further in both the Fourier and spatial domains to mitigate baseline striping and strong point sources. These data were then interpolated onto a HEALPix projection.
• A second version was constructed from data downloaded from the Max Planck Institute for Radioastronomy Survey Sampler website. This version, labeled 'nofilt' on the data download page, was not processed to remove baseline striping or strong point sources.

More details can be found in:

"A 408 MHz All_Sky Continuum Survey. II. The Atlas of Contour Maps",
Haslam, et al., 1982

"A 408 MHz All_Sky Continuum Survey. I. Observations at southern declinations and for the North Polar region",
Haslam, et al., 1981

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