COMPUTING MAGNITUDES AND COLORS

You can download  the program to compute magnitudes and colors for the SEDs you get with GRASIL or for SSPs.

In color.tar you will find the following files:

• ci.for, ci_ini.f90, cisub.for, nr.f90, nrtype.f90, nrutil.f90, num90.f90: these are the program files to compile
   
• bande.dat: is the input file for the program, containing the definition of the bands (the references for the adopted transmission curves are written in this file)
   
• SED_SSP.out, colSED_SSP.out, and example.0, colexample.0, colevol.out: some example files (see explanations below)
   

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If you want to compute magnitudes and colors for SEDs obtained with GRASIL:

• suppose the executable name is color.exe, and the SED file name is example.0, then give the command >color example.0    The program writes the output in a file named colexample.0 (i.e. adds 'col' at the beginning of the file name given as argument) containg absolute magnitudes and a table with the colors.
   
• if you need to have apparent magnitudes and colors for a SED at a given redshift and a given cosmology then give a command like this:
  >color example.0 redshift=1.0 omega=0.3 H_o=70. lambda=0.7 
  In this case there are 2 output files: colexample.0 as before, but with apparent magnitudes instead of absolute, and colevol.out (always this file name independently of the name of the input SED file) that contains the same information as colexample.0 but written in columns.  Thus if you run the redshift evolution of a SED you can for instance rename colevol.out and recursevely append the results.
   

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If you want to compute magnitudes and colors for the SSPs SEDs:

• the program expects an input file SED named SED_SSP.out (with the format that you get with per_SSP.f90 and per_SSP.dat, see explanations here). Write the command >color SED_SSP.out    The output is in a file named colSED_SSP.out containing absolute magnitudes and a table with colors. In this case the computation of mags and colors  with redshift has not been implemented (even if it can be done with a small modification in the code), because the redshift evolution is more meaningful for a galaxy.