Difference in fitting results compared to fortran sedfitter

[mattpovich]

In a test fit of Kurucz model atmospheres to a large (150,000) catalog of combined UKIDSS/2MASS and GLIMPSE point sources in a chunk of the Galactic midplane, I find ~10% more badly fit sources using the python sedfitter than previously with the fortran sedfitter. Best of my knowledge* all fitting parameters are the same (extinction law is your old ex_law_gl.par file, cpd=2, minimum datapoints = 4).

*Am I correct that the format/units of old extinction law files, including lots of extraneous columns, are still appropriate for the python sedfitter?

[astrofrog]

The old extinction files should still work with the new SED fitter. There was a bug I fixed in the Python SED fitter that may have been present in the old fitter that changes the reduced chi^2 values a little. Could you try and compare the chi^2 values for the best fit before and after, and see if the agreement depends on the number of valid fluxes?

[mattpovich]

Yes, I'll see if I can do that when I get some time. Would you be more interested in comparisons using kurucz atmospheres or r06 models? (I have no plans to use the old fortran fitter with the r17 models :-) )

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On Thu, Jul 26, 2018 at 6:33 AM Thomas Robitaille ***@***.***> wrote: The old extinction files should still work with the new SED fitter. There was a bug I fixed in the Python SED fitter that may have been present in the old fitter that changes the reduced chi^2 values a little. Could you try and compare the chi^2 values for the best fit before and after, and see if the agreement depends on the number of valid fluxes? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#62 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AnrfIC1J4-JSwuLoeSOmhakgzjmxH7r4ks5uKcVAgaJpZM4VdFG-> .

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________________________________ Matthew S. Povich Associate Professor Department of Physics and Astronomy College of Science Building 8, Rm 216 Cal Poly Pomona http://www.cpp.edu/~mspovich/ mspovich@cpp.edu Office: (909) 869-3608 Mobile: (617) 306-0411