ABOUT LAMBDA

Foreground Data

Merged all sky H-alpha

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.

Merged all sky H-alpha
Description
File Info
File Name
Delivery Date
H-alpha map, HEALPix Nside 1024, V1.1 49 MB
FITS Hdr
Halpha_fwhm06_1024.fits
2018-04-24
Error map, HEALPix Nside 1024, V1.1 49 MB
FITS Hdr
Halpha_error_fwhm06_1024.fits
2018-04-24
Mask map, HEALPix Nside 1024, V1.1 13 MB
FITS Hdr
Halpha_mask_fwhm06_1024.fits
2018-04-24
H-alpha map, Cartesian 8640 x 4320, V1.1 143 MB
FITS Hdr
Halpha_map.fits
2018-04-24
Error map, Cartesian 8640 x 4320, V1.1 143 MB
FITS Hdr
Halpha_error.fits
2018-04-24
Mask map, Cartesian 8640 x 4320, V1.1 36 MB
FITS Hdr
Halpha_mask.fits
2018-04-24
H-alpha map, HEALPix Nside 512, V1.1 12 MB
FITS Hdr
lambda_halpha_fwhm06_0512.fits
lambda_mollweide_halpha_fwhm06_0512.fits
lambda_zea_halpha_fwhm06_0512.fits
2003-03-01
Error map, HEALPix Nside 512, V1.1 12 MB
FITS Hdr
lambda_halpha_error_fwhm06_0512.fits
lambda_mollweide_halpha_error_fwhm06_0512.fits
lambda_zea_halpha_error_fwhm06_0512.fits
2003-03-01
Mask map, HEALPix Nside 512, V1.1 3 MB
FITS Hdr
lambda_halpha_mask_fwhm06_0512.fits
lambda_mollweide_halpha_mask_fwhm06_0512.fits
lambda_zea_halpha_mask_fwhm06_0512.fits
2008-03-18

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