FITS Headers
lambda_pol_synch_beta_weiland_2022.fits
Primary Header
SIMPLE = T / file does conform to FITS standard BITPIX = 16 / 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 = '2022-08-15T00:00:00' /file creation date (YYYY-MM-DDThh:mm:ss UT) ORIGIN = 'LAMBDA ' / Legacy Archive Microwave Background Analysis OBJECT = 'ALL-SKY ' / Portion of sky given COMMENT This file contains maps of the polarized synchrotron spectral index COMMENT and its uncertainty as determined using Stokes Q and U maps from COMMENT (1) 9yr WMAP 23 and 33 GHz, (2) DRAO and Villa Elisa 1.4 GHz surveys COMMENT and (3) the S-PASS 2.3 GHz survey. COMMENT A mask indicating which frequencies were used to determine the index COMMENT in each pixel is given in the third field. Pixels for which no beta COMMENT determination was made are set to 0.0. REFERENC= 'Weiland et al. 2022 ApJ 936, 24' REFERENC= 'Wolleben/etal 2010 AJ 139, 1681 (DRAO)' REFERENC= 'Testori et al. 2008 A&A 484,733(Villa Elisa)' REFERENC= 'Bennett et al. 2013 ApJS 208, 20 (WMAP)' REFERENC= 'Carretti et al 2019 MNRAS 489, 2330 (S-PASS)' RESOLUTN= 4 / Resolution index SKYCOORD= 'Galactic' / Coordinate system PIXTYPE = 'HEALPIX ' / Pixel algorithm ORDERING= 'NESTED ' / Ordering scheme NSIDE = 16 / Resolution parameter NPIX = 3072 / # of pixels FIRSTPIX= 0 / First pixel (0 based) LASTPIX = 3071 / Last pixel (0 based) END
Map Table
XTENSION= 'BINTABLE' /binary table extension BITPIX = 8 /8-bit bytes NAXIS = 2 /2-dimensional binary table NAXIS1 = 12 /width of table in bytes NAXIS2 = 3072 /number of rows in table PCOUNT = 0 /size of special data area GCOUNT = 1 /one data group (required keyword) TFIELDS = 3 /number of fields in each row TTYPE1 = 'SPINDEX' /polarized synchrotron spectral index TFORM1 = 'E ' / data format of field: 4-byte REAL TUNIT1 = ' ' /physical unit of field TTYPE2 = 'SIGMA ' / 1-sigma uncertainty TFORM2 = 'E ' / data format of field: 4-byte REAL TUNIT2 = ' ' /physical unit of field TTYPE3 = 'MASK ' / coded mask indicating frequencies used TFORM3 = 'E ' / data format of field: 4-byte REAL TUNIT3 = ' ' /physical unit of field EXTNAME = 'Map Table' /name of this binary table extension DATE = '2022-08-15T00:00:00' /Table/MAP creation date PIXTYPE = 'HEALPIX ' /Pixel algorithm ORDERING= 'NESTED ' /Ordering scheme NSIDE = 16 /Resolution parameter FIRSTPIX= 0 /First pixel (0 based) LASTPIX = 3071 /Last pixel (0 based) COMMENT Mask values coded as follows: COMMENT 0 = no determination COMMENT 1 = [23, 33] GHz COMMENT 2 = [1.4, 23, 33] GHz COMMENT 3 = [2.3, 23, 33] GHz END
