FITS Headers
dmr_gal_mask_4yr.fits
Primary Header
SIMPLE = T / BITPIX = 16 / Number of bits per data pixel NAXIS = 0 / Number of data axes EXTEND = T / FITS data may contain extensions DATE = '2005-01-10' / Creation date (CCYY-MM-DD) of FITS header COMMENT FITS (Flexible Image Transport System) format is defined in 'Astronomy COMMENT and Astrophysics', volume 376, page 359; bibcode 2001A&A...376..359H TELESCOP= 'COBE ' / INSTRUME= 'DMR ' / OBJECT = 'ALL-SKY ' / COMMENT COMMENT This file contains the 'custom' Galaxy mask used in the analysis of COMMENT the 4-year DMR maps (Bennett et al., reference below). The mask data COMMENT have been recast from the original COBE 'quad-cube' pixel format into COMMENT the HEALPix tessellation, for use with the DMR HEALPix format sky COMMENT maps. The mask information is contained in the N_OBS field: pixels COMMENT which lie outside the Galaxy cut have N_OBS set to 1; those which lie COMMENT within the cut have N_OBS set to 0. The 'custom' cut is defined as COMMENT pixels with Galactic latitude |b| < 20 degrees with additional cutouts COMMENT defined by DIRBE 140 um intensity contours. COMMENT REFERENC= 'C.L.Bennett, et.al., ApJL, 1996, 464, L1' / REFERENC= 'A. Kogut, et al., ApJ, 1996, 470, 653' / REFERENC= 'E.L. Wright, et al., ApJL, 1996, 458, L53' / REFERENC= 'K.M. Gorski, et al., astro-ph/0409513' / STOKES = 'INTENSITY' / EQUINOX = 2000.00 / SKYCOORD= 'GALACTIC' / PIXTYPE = 'HEALPIX ' / ORDERING= 'NESTED ' / RESOLUTN= 5 / NSIDE = 32 / NPIX = 12288 / FIRSTPIX= 0 / LASTPIX = 12287 / DATE-BEG= '22/12/1989' /Data set start date JSTART = '1989356000000000' /Start time YYYYDDDHHMMSSHHH DATE-END= '21/12/1993' /Data set start date JSTOP = '1993355235959000' /Stop time YYYYDDDHHMMSSHHH COMMENT DATE-BEG and DATE-END give the date during which COMMENT the earliest and the latest data used in this product COMMENT were obtained. END
Extension Header 2
XTENSION= 'BINTABLE' /binary table extension BITPIX = 8 /8-bit bytes NAXIS = 2 /2-dimensional binary table NAXIS1 = 8 /width of table in bytes NAXIS2 = 12288 /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 ' / TFORM1 = 'E ' /Real*4 (floating point) TTYPE2 = 'N_OBS ' / TFORM2 = 'E ' /Real*4 (floating point) PIXTYPE = 'HEALPIX ' /HEALPIX pixelisation ORDERING= 'NESTED ' /Pixel ordering scheme, either RING or NESTED OBJECT = 'FULLSKY ' / COORDSYS= 'G ' /Pixelization coordinate system NSIDE = 32 /Healpix resolution parameter NPIX = 12288 /Total number of pixels FIRSTPIX= 0 /First pixel # (0 based) LASTPIX = 12287 /Last pixel # (zero based) INDXSCHM= 'IMPLICIT' /indexing : IMPLICIT or EXPLICIT GRAIN = 0 /GRAIN = 0: No index, COMMENT G = Galactic, E = ecliptic, C = celestial = equatorial COMMENT GRAIN =1: 1 pixel index for each pixel, COMMENT GRAIN >1: 1 pixel index for Grain consecutive pixels COMMENT COMMENT TEMPERATURE is set to 0 for all pixels. This field COMMENT is filled only to provide consistent map format. COMMENT N_obs is the boolean mask, where 0 means exclude, 1 means include. END
