FITS Headers
wmap_w4_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 = 'W4 ' /Differencing Assembly FREQ = 'W 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
