Microwave Dust Maps

Retrieve Data
You must download both a copy of the data and of the software. Please email schlegel@astro.princeton.edu to report that you have obtained a copy of the maps. We can then send you information on updates.

Data

The maps required for prediction of microwave dust emission are the SFD98 100 micron map (previously released; ApJ, 500, 525 ), and a filtered DIRBE 100/240 micron ratio map (FINK_R) which is new in the current data release. Also available is the previously-released pixel mask for the 100 micron map. Data are available in two projections, Lambert (Zenith Equal Area about the Galactic Poles) and HEALPIX.

Lambert Projections:

The maps are available in 3 sizes: 10242, 20482, and 40962. You should be using the full-resolution 40962 maps if possible. The smaller sizes are provided for convenience, but lack the full resolution. Note that the R map is only computed at low resolution.

There are three full-sky maps, each stored as two files (one for the Northern Galactic Hemisphere, one for the Southern). The following maps are available individually:

Map File names Description Download individual files
I100 SFD_i100*.fits 100-micron [MJy/Sr] 1024: NGP SGP, 2048: NGP SGP, 4096: NGP SGP
mask SFD_mask*.fits 8-bit mask 1024: NGP SGP, 2048: NGP SGP, 4096: NGP SGP
R FINK_Rmap*.fits DIRBE Ratio 1024: NGP SGP

You may also obtain all the files at a given resolution as a g-zipped Unix tar file:
 1024 maps (23 MB)
2048 maps (59 MB)
4096 maps (203 MB)

Or you may obtain any of these files via anonymous ftp. To obtain the 4096 E(B-V) maps and their masks:
 ftp deep.berkeley.edu
login as anonymous
cd pub/dust/maps
bin (to set transfer type binary)
prompt off
mget SFD_i100_4096*.fits
mget SFD_mask_4096*.fits
mget FINK_Rmap*.fits
quit

HEALPIX

These maps are also provided in HEALPIX. Click here for more.

Software

You may access the data using IDL, Fortran or C code.

IDL README file -- IDL code (gzipped tar - 64kB)

C+Fortran README file -- C+FORTRAN code (gzipped tar - 29kB)

Web page designers:
David Schlegel, schlegel@astro.princeton.edu
Douglas Finkbeiner, dfink@astro.berkeley.edu