FITS Headers
wmap_v1_cleanimap_yr1_v1.fits
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