FITS Headers
ISSA_B1H0_healpix_ns1024.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 = '2005-03-04' / file creation date (YYYY-MM-DD) TELESCOP= 'IRAS ' / Infrared Astronomical Satellite OBJECT = 'ALL-SKY ' / Portion of sky given COMMENT This file contains a HEALPix map of 12 micron intensity formed from COMMENT IRAS Sky Survey Atlas (ISSA) data. It was made by averaging the COMMENT coadded (HCON 0) ISSA data over HEALPix pixels. Overlapping data COMMENT between neighboring ISSA fields were excluded. All of the ISSA fields COMMENT were used, including the Reject fields at low ecliptic latitudes where COMMENT residuals after subtraction of the zodiacal emission model are COMMENT significant. Minor discontinuities are present at field boundaries COMMENT at some locations in the map, due to intensity differences between COMMENT neighboring fields at low ecliptic or Galactic latitude. Sky coverage COMMENT is about 98%, and intensity values are set to -32768 for HEALPix COMMENT pixels that contain no ISSA data. REFERENC= 'Legacy Archive for Microwave Background Data Analysis (LAMBDA) ' REFERENC= ' http://lambda.gsfc.nasa.gov/ ' REFERENC= 'IRAS Sky Survey Atlas Explanatory Supplement, ' REFERENC= ' Wheelock, S.L., et al., 1994, JPL Publication 94-11 (Pasadena: JPL)' REFERENC= ' http://lambda/product/iras/docs/issa.exp.sup/ ' REFERENC= 'HEALPix Home Page: http://www.eso.org/science/healpix/ ' FREQ = ' 12 micron band' / Wavelength band RESOLUTN= 10 / Resolution index SKYCOORD= 'Galactic' / Coordinate system PIXTYPE = 'HEALPIX ' / Pixel algorithm ORDERING= 'NESTED ' / Ordering scheme NSIDE = 1024 / Resolution parameter NPIX = 12582912 / # of pixels FIRSTPIX= 0 / First pixel (0 based) LASTPIX = 12582911 / 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 = 12582912 /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 = 'Intensity' /label for field 1 TFORM1 = '1E ' /data format of field: 4-byte REAL TUNIT1 = 'MJy sr-1' /physical unit of field TTYPE2 = 'N_PIXELS' /label for field 2 TFORM2 = '1E ' /data format of field: 4-byte REAL TUNIT2 = 'ISSA pixel count' /physical unit of field EXTNAME = 'Archive Map Table' /name of this binary table extension DATE = '2005-03-04' /Table/MAP creation date (YYYY-MM-DD) PIXTYPE = 'HEALPIX ' /Pixel algorithm ORDERING= 'NESTED ' /Ordering scheme NSIDE = 1024 /Resolution parameter FIRSTPIX= 0 /First pixel (0 based) LASTPIX = 12582911 /Last pixel (0 based) COMMENT Intensity is average of ISSA 12 micron data over HEALPix pixels COMMENT N_PIXELS is number of ISSA pixels contributing to each HEALPix pixel END
