Hi,

I have a quick question about the ISRF data files for version 54. There're lots of data files under the ISRF/Standard directory, but I was not able to find a documentation of how the files are named (or could you please point me to one?). For example, what does Standard_8.5_0_30_[Flux,Scattered,Termal_HP,Total_HP,Transient_HP].dat mean? If I'd like to look for a file similar to MilkyWay_DR0.5_DZ0.1_DPHI10_RMAX20_ZMAX5_galprop_format.fits in v50, but with updated data and extended zmax to 20kpc, which file should I use?

Thanks a lot for your help!

The file `Standard.dat' provides a basic (ASCII) directory structure that is read by GALPROP. Each part of this, e.g., Standard_X_Y_Z_(name)_HP.fits.gz gives certain components of the ISRF at the (X,Y,Z) location (in kpc). The important files for IC losses are the Standard_X_Y_Z_Total_HP.fits.gz and Standard_X_Y_Z_Flux.fits.gz -- these give the intensity and integrated flux as a function of frequency at the location X,Y,Z, respectively. GALPROP simply reads in the sampled ISRF and bi-linearly interpolates (for 2D) to give the ISRF for a location that is not at one of the sampled grid points. There is no `simple' file like the earlier versions because of the additional angular information, and break down into different components (I can provide a description of what the different components are for, but this is only of interest if you want to use them for studies unrelated to calculating total IC emission/energy losses).

_________________
Dr. Troy A. Porter
Hansen Experimental Physics Laboratory
452 Lomita Mall
Stanford University
Stanford, CA 94305

Hi Troy,

Thanks a lot for your reply. I have a related question: What is the main differences between the ISRF in v54 and v50? For my application I'd like to compute a simulated gamma-ray map using the ISRF data up to z=6kpc. Do you expect the results to be significantly different if I use extrapolated values from the ISRF v50 or the ISRF v54 which extends to zmax=20kpc?

Thanks in advance!