Renewal of gas distributions in Webrun
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Author:  astrotula [ Tue Oct 08, 2013 10:13 pm ]
Post subject:  Renewal of gas distributions in Webrun

I noticed that slightly different gas distribution files are used in Webrun and in the galprop version for download. I guess that the latter ones are newer. Particularly, the downloadable version suggests to use "rbands_co10mm_v3_2001_hdeg.fits.gz" for the CO distribution and "rbands_hi12_v5_hdeg_zmax1_Ts125.fits.gz" for the HI distribution. These files seem to be unavailable in Webrun. Instead, by default Webrun suggests to use "rbands_co10mm_v2_2001_qdeg.fits" and "rbands_hi12_v2_qdeg_zmax1_Ts125.fits" respectively. I would like to propose to make available for users similar options both in Webrun and downlodable version, because it's really useful for an opportunity of precise one-to-one "calibration" between the Stanford and a local machine runs.

Author:  gudlaugu [ Wed Oct 09, 2013 1:06 am ]
Post subject:  Re: Renewal of gas distributions in Webrun

The only difference between the files is the resolution, the downloadable files have half a degree resolution while the webrun files have a quarter of a degree. This is deliberate, because the underlying resolution of the LAB gas survey is around half a degree.
You should get the exact same results from webrun and the downloadable code if you use the same spatial resolution and CAR projection output from GALPROP. The HEALPix option will be only slightly different because the pixel boundaries do not match between the output and the input.

Author:  astrotula [ Thu Oct 24, 2013 9:10 pm ]
Post subject:  Re: Renewal of gas distributions in Webrun

And just in case to close this topic: different numbers after "v" letter in the file names above - v3,v5 vs. v2 - also don't make any significant difference, right? And what did you mean by CAR?

Author:  gudlaugu [ Fri Oct 25, 2013 2:30 am ]
Post subject:  Re: Renewal of gas distributions in Webrun

I did not say the numbers aren't significant, only that the differences between the files in webrun and those distributed with the code is the resolution. And there is not a one-to-one correlation between the version numbers of the HI and CO files, they are just bumped up when we make changes to the files, some of which are never released.
CAR is plate carrée projection. It is used unless healpix output is selected.

Author:  astrotula [ Fri Oct 25, 2013 9:53 am ]
Post subject:  Re: Renewal of gas distributions in Webrun


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