FITS Headers


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    = '2024-02-14T00:00:00' /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 1-0 line survey release 
COMMENT   of Dame and Thaddeus (2022).  Data are a merge of the Galactic plane  
COMMENT   CO survey of Dame, Hartmann & Thaddeus (2001), and subsequent         
COMMENT   complementary coverage of the entire northern sky (decl > -17 deg)    
COMMENT   using the same telescope.  The merged survey is released by the       
COMMENT   authors in the form of CO line spectral data cubes.                   
COMMENT   To create this file, the moment-masked data cube for the combined     
COMMENT   survey was obtained from the CfA Millimeter Wave Group website        
COMMENT   (see ref below) and integrated over +/- 36 km/sec. The velocity       
COMMENT   integrated intensity map in rectilinear coordinates was then          
COMMENT   interpolated onto a HEALPix grid with Nside=256.                      
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= 'A CO Survey of the Entire Northern Sky,                              
REFERENC= 'Dame & Thaddeus 2022 ApJS, 262, 5.                                   
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= '    https://lweb.cfa.harvard.edu/mmw/                                
REFERENC= 'HEALPix Home Page: https://healpix.jpl.nasa.gov/                     
FREQ    = '115 GHz CO 1-0 line'/ Frequency band                                 
RESOLUTN=                    8 / Resolution index                               
SKYCOORD= 'Galactic'           / Coordinate system                              
PIXTYPE = 'HEALPIX '           / Pixel algorithm                                
ORDERING= 'NESTED  '           / Ordering scheme                                
NSIDE   =                  256 / Resolution parameter                           
NPIX    =               786432 / # of pixels                                    
FIRSTPIX=                    0 / First pixel (0 based)                          
LASTPIX =               786431 / Last pixel (0 based)                           

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  =               786432 / 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    = '2024-02-14T00:00:00' / Table creation date                           
PIXTYPE = 'HEALPIX '           / Pixel algorithm                                
ORDERING= 'NESTED  '           / Ordering scheme                                
INDXSCHM= 'IMPLICIT'           / indexing implicit for full sky map             
NSIDE   =                  256 / Resolution parameter                           
FIRSTPIX=                    0 / First pixel (0 based)                          
LASTPIX =               786431 / 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.                            

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