WMAP Foreground Reduced Single Year I,Q,U Maps Per Differencing Assembly
FITS Header Information

The maps are contained in a binary table TEMPERATURE, Q_POLARISATION, U_POLARISATION, and N_OBS columns. A second table supplies the noise covariance matrices of the polarization maps.

Primary Header

SIMPLE  =                    T /FITS format
BITPIX  =                   16 /Dummy primary header
NAXIS   =                    0 /No data is associated with this header
EXTEND  =                    T /Extensions may (will!) be present
RESOLUTN=                    9 /Resolution Index
PIXTYPE = 'HEALPIX '           /Pixel algorigthm
ORDERING= 'NESTED  '           /Ordering scheme
NSIDE   =                  512 /Resolution Parameter
NPIX    =              3145728 /Number of pixels
FIRSTPIX=                    0 /First pixel (0 based)
LASTPIX =              3145727 /Last pixel (0 based)
COMMENT This file contains WMAP Intensity and Polarization (I, Q, and U)
COMMENT Res 9 Foreground Reduced skymaps for the differencing assembly
COMMENT indicated by the DA keyword.
COMMENT There is no Ka1 foreground cleaned kkahadust intensity map.
COMMENT Therefore this file contains an empty map in the TEMPERATURE
COMMENT column of the Stokes Maps table
COMMENT The first year of data went into the map.
DATE    = '2009-12-09T18:25:38' /file creation date (YYYY-MM-DDThh:mm:ss UT)
TELESCOP= 'WMAP    '           /Wilkinson Microwave Anisotropy Probe
REFERENC= 'WMAP Explanatory Supplement:  http://lambda.gsfc.nasa.gov/' /
STOKES  = 'IQU     '           /
DA      = 'Ka1     '           /WMAP Differencing Assembly
FREQ    = 'Ka band '           /Frequency band
RELEASE = 'DR4     '           /WMAP Release
END

Temperature and Polarization Map Table

XTENSION= 'BINTABLE'           /binary table extension
BITPIX  =                    8 /8-bit bytes
NAXIS   =                    2 /2-dimensional binary table
NAXIS1  =                   16 /width of table in bytes
NAXIS2  =              3145728 /number of rows in table
PCOUNT  =                    0 /size of special data area
GCOUNT  =                    1 /one data group (required keyword)
TFIELDS =                    4 /number of fields in each row
COMMENT
COMMENT  *** End of mandatory fields ***
COMMENT
COMMENT
COMMENT  *** End of mandatory fields ***
COMMENT
COMMENT
COMMENT  *** Column names ***
COMMENT
COMMENT
COMMENT  *** Column formats ***
COMMENT
COMMENT
COMMENT  *** Column names ***
COMMENT
TTYPE1  = 'TEMPERATURE '       /
COMMENT
COMMENT  *** Column formats ***
COMMENT
TFORM1  = 'E       '           /
TUNIT1  = 'mK,thermodynamic'   /
TTYPE2  = 'Q_POLARISATION '    /
TFORM2  = 'E       '           /
TUNIT2  = 'mK,thermodynamic'   /
TTYPE3  = 'U_POLARISATION '    /
TFORM3  = 'E       '           /
TUNIT3  = 'mK,thermodynamic'   /
TTYPE4  = 'N_OBS   '           /
TFORM4  = 'E       '           /
TUNIT4  = 'counts  '           /
EXTNAME = 'Stokes Maps'        /
DATE    =                    0 /
PIXTYPE = 'HEALPIX '           /
ORDERING= 'NESTED  '           /
NSIDE   =                  512 /
FIRSTPIX=                    0 /
LASTPIX =              3145727 /
END

Noise Covariance Table

XTENSION= 'BINTABLE'           /binary table extension
BITPIX  =                    8 /8-bit bytes
NAXIS   =                    2 /2-dimensional binary table
NAXIS1  =                   16 /width of table in bytes
NAXIS2  =              3145728 /number of rows in table
PCOUNT  =                    0 /size of special data area
GCOUNT  =                    1 /one data group (required keyword)
TFIELDS =                    4 /number of fields in each row
COMMENT
COMMENT  *** End of mandatory fields ***
COMMENT
COMMENT
COMMENT  *** End of mandatory fields ***
COMMENT
COMMENT
COMMENT  *** Column names ***
COMMENT
COMMENT
COMMENT  *** Column formats ***
COMMENT
COMMENT
COMMENT  *** Column names ***
COMMENT
TTYPE1  = 'N_OBS   '           /
COMMENT
COMMENT  *** Column formats ***
COMMENT
TFORM1  = 'E       '           /
TTYPE2  = 'QQ      '           /
TFORM2  = 'E       '           /
TUNIT2  = 'counts  '           /
TTYPE3  = 'QU      '           /
TFORM3  = 'E       '           /
TUNIT3  = 'counts  '           /
TTYPE4  = 'UU      '           /
TFORM4  = 'E       '           /
TUNIT4  = 'counts  '           /
EXTNAME = 'Weight Arrays'      /
DATE    =                    0 /
PIXTYPE = 'HEALPIX '           /
ORDERING= 'NESTED  '           /
NSIDE   =                  512 /
FIRSTPIX=                    0 /
LASTPIX =              3145727 /
COMMENT Weight arrays must be divided by a scaling factor sigma_0^2
COMMENT to provide a weight array in physical units (mK^-2).  See WMAP
COMMENT Explanatory Supplement.
END

More information concerning the contents of this file is available.