ABOUT LAMBDA

Foreground Data

IRAS/ISSA Plates

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.

IRAS/ISSA Plates
Description
File Info
File Name
Delivery Date
Band 1 (12 um) 98 MB
FITS Hdr
ISSA_B1H0_healpix_ns1024.fits
ISSA_mollweide_B1H0_healpix_ns1024.fits
ISSA_zea_B1H0_healpix_ns1024.fits
2003-03-01
Band 2 (25 um) 98 MB
FITS Hdr
ISSA_B2H0_healpix_ns1024.fits
ISSA_mollweide_B2H0_healpix_ns1024.fits
ISSA_zea_B2H0_healpix_ns1024.fits
2003-03-01
Band 3 (60 um) 98 MB
FITS Hdr
ISSA_B3H0_healpix_ns1024.fits
ISSA_mollweide_B3H0_healpix_ns1024.fits
ISSA_zea_B3H0_healpix_ns1024.fits
2003-03-01
Band 4 (100 um) 98 MB
FITS Hdr
ISSA_B4H0_healpix_ns1024.fits
ISSA_mollweide_B4H0_healpix_ns1024.fits
ISSA_zea_B4H0_healpix_ns1024.fits
2003-03-01

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