ABOUT LAMBDA

FITS Header

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    = '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

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  = 'K km s-1'           /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    = '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

A service of the HEASARC and of the Astrophysics Science Division at NASA/GSFC
Goddard Space Flight Center, National Aeronautics and Space Administration
HEASARC Director: Dr. Alan P. Smale
LAMBDA Director: Dr. Eric R. Switzer
NASA Official: Dr. Eric R. Switzer
Web Curator: Mr. Michael R. Greason