Galactic Dust Reddening

Schlegel, Finkbeiner & Davis (SFD98) derived an all-sky map of Galactic reddening, E(B-V), from a composite 100 micron emission map constructed from the IRAS/ISSA observations, and calibrated using DIRBE. The resulting E(B-V) map is in units of magnitudes and is frequently used to estimate Galactic foreground extinction.

The full-sky SFD98 E(B-V) map distributed here is in J2000 Equatorial coordinates with NSIDE=512. It was derived from the full-sky SFD98 E(B-V) map in Galactic coordinates that is available from NASA's LAMBDA portal here. The LAMBDA full-sky Galactic Healpix map was drizzled onto J2000 Equatorial WCS FITS templates (each with 500 x 500 1.'5 square pixels), which were then combined using the drizzling algorithm to create the full-sky J2000 Equatorial Healpix map. More information about the limitations and caveats of the original Galactic SFD98 E(B-V) Healpix map is available on the LAMBDA page.

Healpix map made by A. Hughes.


  • 'Maps of Dust Infrared Emission for Use in Estimation of Reddening and Cosmic Microwave Background Radiation Foregrounds' by Schlegel, Finkbeiner & Davis, 1998, ApJ, 500, 525.

J2000 Map

* E(B-V) SF98 EBV_SFD98_1_512.fits


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