WMAP FITS Header

Primary Header

SIMPLE  =                    T / file does conform to FITS standard
BITPIX  =                    8 / number of bits per data pixel
NAXIS   =                    0 / number of data axes
EXTEND  =                    T / FITS dataset may contain extensions
COMMENT   FITS (Flexible Image Transport System) format is defined in 'Astronomy
COMMENT   and Astrophysics', volume 376, page 359; bibcode: 2001A&A...376..359H
DATE    = '2003-06-25T00:00:00' /file creation date (YYYY-MM-DDThh:mm:ss UT)
OBJECT  = 'ALL-SKY '           / Portion of sky given
COMMENT   This file contains the 'foreground-cleaned' sky map for the
COMMENT   differencing assembly indicated by the keyword 'DA'.  This map was
COMMENT   used in the generation of the WMAP first-year CMB power spectrum.
COMMENT   The Galactic foreground signal was removed using the 5-parameter
COMMENT   template fitting method described in Bennett et al. (2003).  Since
COMMENT   these maps were generated early in the first-year analysis, prior to
COMMENT   the final Galaxy modeling effort, the template coefficients used to
COMMENT   clean this map are slightly different than the ones reported in
COMMENT   Bennett et al. (2003).  The differences are of no consequence for
COMMENT   cosmological applications.  Note that since the templates were fit
COMMENT   only with data outside of the Kp2 mask, the foreground removal is not
COMMENT   applicable to regions near the Galactic plane, where the spectrum of
COMMENT   the Galactic emission is different.
COMMENT
COMMENT   See the WMAP Explanatory Supplement for further details.
REFERENC= 'WMAP Explanatory Supplement: http://lambda.gsfc.nasa.gov/
REFERENC= 'Bennett et al. 2003, First Year WMAP Observations: Foreground
REFERENC= '  Emission, ApJ
VERSION = 'PASS 1  '           / Internal MAP Version
STARTGMT= '20012220000000000000' / Start time of TOD used
ENDGMT  = '20022212359000000000' / End time of TOD used
DA      = 'V1      '           /Differencing Assembly
FREQ    = 'V band  '           /Frequency band
STOKES  = 'Intensity'          / i,q, or u
RESOLUTN=                    9 / Resolution index
SKYCOORD= 'Galactic'           / Coordinate system
GALMASK = 'Kp2'                / Galaxy mask
PIXTYPE = 'HEALPIX '           / Pixel algorithm
ORDERING= 'NESTED  '           / Ordering scheme
NSIDE   =                  512 / Resolution parameter
NPIX    =              3145728 / # of pixels
FIRSTPIX=                    0 / First pixel (0 based)
LASTPIX =              3145727 / Last pixel (0 based)
END

Archive Map Table

XTENSION= 'BINTABLE'           /binary table extension
BITPIX  =                    8 /8-bit bytes
NAXIS   =                    2 /2-dimensional binary table
NAXIS1  =                    8 /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 =                    2 /number of fields in each row
TTYPE1  = 'TEMPERATURE'        /label for field   1
TFORM1  = '1E      '           /data format of field: 4-byte REAL
TUNIT1  = 'mK, thermodynamic'  /physical unit of field
TTYPE2  = 'N_OBS   '           /label for field   2
TFORM2  = '1E      '           /data format of field: 4-byte REAL
TUNIT2  = 'counts  '           /physical unit of field
EXTNAME = 'Archive Map Table'  /name of this binary table extension
DATE    = '2003-06-25T00:00:00' /Table creation date
PIXTYPE = 'HEALPIX '           /Pixel algorithm
ORDERING= 'NESTED  '           /Ordering scheme
NSIDE   =                  512 /Resolution parameter
FIRSTPIX=                    0 /First pixel (0 based)
LASTPIX =              3145727 /Last pixel (0 based)
COMMENT   The TEMPERATURE field is in thermodynamic units
COMMENT   N_obs is the effective number of observations in the pixel
END