FITS Headers
wmap_halpha_template_v5.fits
Primary Header
SIMPLE = T / file does conform to FITS standard BITPIX = 32 / 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 = '2012-09-05T00:00:00' /file creation date OBJECT = 'ALL-SKY ' / Portion of sky given COMMENT This file contains the Halpha template used by the WMAP team in the COMMENT removal of Galactic foregrounds from the 9-year maps. The template is COMMENT constructed by applying extinction and scattering corrections to the COMMENT composite Halpha map of Finkbeiner (2003). The extinction correction COMMENT assumes an intermix of gas and dust, as described in Bennett et al. COMMENT (2003). The optical depth tau used in the correction is computed as COMMENT tau = 2.2*E(B-V), where E(B-V) is obtained from the Galactic reddening COMMENT maps of Schlegel, Finkbeiner and Davis (1998). The scattering COMMENT correction is based on correlations between H alpha and 100 micron COMMENT emission and is described in Bennett et al. (2013). The extinction COMMENT and scattering corrected map has been smoothed to a FWHM of 1 degree. COMMENT This file is distributed and maintained by LAMBDA. COMMENT The as-observed Halpha and E(B-V) maps are also available from LAMBDA. REFERENC= 'Legacy Archive for Microwave Background Data Analysis (LAMBDA) ' REFERENC= ' http://lambda.gsfc.nasa.gov/ ' REFERENC= 'First-Year WMAP Observations: Foreground Emission, ' REFERENC= ' Bennett et al. 2003 ApJS 148, 97 ' REFERENC= 'A Full-Sky Halpha Template for Microwave Foreground Prediction', REFERENC= ' Finkbeiner 2003 ApJS 146, 407 ' REFERENC= 'Maps of Dust Infrared Emission for Use in Estimation of Reddening ' REFERENC= ' and Cosmic Microwave Background Radiation Foregrounds,' REFERENC= ' Schlegel, Finkbeiner & Davis 1998 ApJ 500, 525 ' REFERENC= 'Berkeley mirror site for SFD98 data: ' REFERENC= ' http://astron.berkeley.edu/dust/ ' REFERENC= 'HEALPix Home Page: http://www.eso.org/science/healpix/ ' RESOLUTN= 9 / Resolution index SKYCOORD= 'Galactic' / Coordinate system 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) RELEASE = 'DR5 ' /WMAP Release TELESCOP= 'WMAP ' / 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 COMMENT COMMENT *** End of mandatory fields *** COMMENT COMMENT COMMENT *** Column names *** COMMENT TTYPE1 = 'TEMPERATURE' /label for field 1 COMMENT COMMENT *** Column formats *** COMMENT TFORM1 = 'E ' /data format of field: 4-byte REAL TUNIT1 = 'Rayleighs' /physical unit of field TTYPE2 = 'N_OBS ' /label for field 2 TFORM2 = 'E ' /data format of field: 4-byte REAL TUNIT2 = 'counts ' /physical unit of field EXTNAME = 'Archive Map Table' /name of this binary table extension DATE = '2012-09-05T00:00:00' /file 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 COMMENT *** End of mandatory fields *** COMMENT COMMENT COMMENT *** Column names *** COMMENT COMMENT COMMENT *** Column formats *** COMMENT COMMENT The TEMPERATURE field contains Halpha emission in Rayleighs. COMMENT N_obs is set to 1 for all pixels. The N_obs field is filled COMMENT only to provide a format consistent with that used by COMMENT WMAP products. END
