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    = '2006-03-03T00:00:00' /file creation date (YYYY-MM-DDThh:mm:ss UT)    
OBJECT  = 'ALL-SKY '           / Portion of sky given                           
COMMENT   This file contains the Halpha template used by the WMAP team in the   
COMMENT   removal of Galactic foregrounds from the 3-year Temperature maps.  The
COMMENT   template is constructed by applying an extinction correction to the   
COMMENT   composite Halpha map of Finkbeiner (2003).  The extinction correction 
COMMENT   assumes an intermix of gas and dust, as described in Bennett et al.   
COMMENT   (2003).  The optical depth tau used in the correction is computed as  
COMMNET   tau = 2.2*E(B-V), where E(B-V) is obtained from the Galactic reddening
COMMENT   maps of Schlegel, Finkbeiner and Davis (1998).                        
COMMENT   The extinction-corrected map has been smoothed to a FWHM of 1 degree. 
COMMENT   This file is distributed and maintained by LAMBDA.                    
COMMENT   The as-observed Halpha and E(B-V) maps are also available from LAMBDA.
REFERENC= 'Legacy Archive for Microwave Background Data Analysis (LAMBDA)  '    
REFERENC= '                http://lambda.gsfc.nasa.gov/                    '    
REFERENC= 'First-Year WMAP Observations: Foreground Emission, '                 
REFERENC= ' Bennett et al. 2003 ApJS 148, 97  '                                 
REFERENC= 'A Full-Sky Halpha Template for Microwave Foreground Prediction',     
REFERENC= ' Finkbeiner 2003 ApJS 146, 407  '                                    
REFERENC= 'Maps of Dust Infrared Emission for Use in Estimation of Reddening '  
REFERENC= ' and Cosmic Microwave Background Radiation Foregrounds,'             
REFERENC= ' Schlegel, Finkbeiner & Davis 1998 ApJ 500, 525 '                    
REFERENC= 'Berkeley mirror site for SFD98 data: '                               
REFERENC= '                      http://astron.berkeley.edu/dust/ '             
REFERENC= 'HEALPix Home Page: http://www.eso.org/science/healpix/ '             
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)                           

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                    
TTYPE1  = 'TEMPERATURE'        /label for field   1                             
TFORM1  = '1E      '           /data format of field: 4-byte REAL               
TUNIT1  = 'Rayleighs'          /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    = '2006-03-03T00:00:00' /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 Halpha emission in Rayleighs.          
COMMENT   N_obs is set to 1 for all pixels. The N_obs field is filled           
COMMENT    only to provide a format consistent with that used by                
COMMENT    WMAP products.                                                       

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