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Using surveys different from LAB
https://galprop.stanford.edu/forum/viewtopic.php?f=5&t=154		 Page 1 of 1
Author:  simo [ Wed Nov 28, 2012 5:27 am ]
Post subject:  Using surveys different from LAB
I'm new to GALPROP and I was wondering if there is a way to use my own gas column density distribution (taken from other surveys) and feed GALPROP with that to get the emission.

Thanks,
Simone
Author:  strong [ Wed Nov 28, 2012 9:36 am ]
Post subject:  Re: Using surveys different from LAB
yes, just make a file in the same format (FITS 17 rings with same radius boundaries) and replace its name in the GALDEF file.
Author:  gudlaugu [ Wed Nov 28, 2012 9:44 am ]
Post subject:  Re: Using surveys different from LAB
Hi Simone,

It is possible to use your own gas column density distributions as long as it follows the format required for GALPROP. It does not allow for much freedom.

The maps should be in CAR projection with the galactic center at the left boundary of the map and l increasing to the right. This is opposite to the usual convention.

The maps should be split up into galacto-centric annuli with the annuli boundaries given in a table in the first extension. The CO and HI maps should have identical boundaries.

It should be best to try to imitate the files distributed as closely as possible. There is very minimal error checking when reading in the files so you should carefully check the results.

For a description of how we generate the annuli maps for GALPROP, please see the appendix of
http://adsabs.harvard.edu/abs/2012ApJ...750....3A
Author:  strong [ Wed Nov 28, 2012 10:36 am ]
Post subject:  Re: Using surveys different from LAB
Re FITS standard:
it is standard enough FITS to have e.g. CRVAL1=0.25 and CDELT1=0.5 for longitude as we do thoughout GALPROP (also in the CAR output skymaps). The orientation should be taken care of in the visualization tool. There is no 'left' or 'right' in a FITS file, just numbers !
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