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Velocity-Integrated W(CO)
FITS Header Information
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 = '2003-04-21T00:00:00' /file creation date (YYYY-MM-DDThh:mm:ss UT) OBJECT = 'ALL-SKY ' / Portion of sky given COMMENT This file contains data from the composite CO map constructed by COMMENT Dame, Hartmann and Thaddeus (2001) from 37 individual surveys of the COMMENT Galaxy in the CO (1-0) line. Due to the composite nature of the map COMMENT and processing used to render a uniform S/N appearance, the user is COMMENT cautioned that angular resolution and sensitivity vary across the map. COMMENT Survey data are limited to Galactic latitudes |b|<32 deg., with COMMENT roughly half of that area containing observations. COMMENT To create this file, the velocity-integrated brightness temperature COMMEN map, W(CO), was obtained from the CfA Millimeter Wave Group website COMMENT (see below) and then interpolated onto a HEALPix grid with Nside=512. COMMENT This file is distributed and maintained by LAMBDA. REFERENC= 'Legacy Archive for Microwave Background Data Analysis (LAMBDA) REFERENC= ' http://lambda.gsfc.nasa.gov/ REFERENC= 'The Milky Way in Molecular Clouds: A New Complete CO Survey, REFERENC= 'Dame, Hartmann & Thaddeus 2001 ApJ, 547, 792. REFERENC= 'Harvard-Smithsonian Center for Astrophysics Millimeter Wave Group: REFERENC= ' http://cfa-www.harvard.edu/cfa/mmw/MilkyWayinMolClouds.html REFERENC= 'HEALPix Home Page: http://www.eso.org/science/healpix/ FREQ = '115 GHz CO 1-0 line'/ Frequency band 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) END
Extension Header #1
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 = 'K km s-1' /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 = '2003-04-21T00:00:00' /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 contains the velocity integrated main beam COMMENT brightness temperature, W(CO), in K km/sec. COMMENT N_obs is set to 1 for those pixels for which survey data were COMMENT available. Otherwise, N_obs is set to 0. END
More information concerning the format of this file is available.
