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