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editeodoro / Bbarolo

Bbarolo is a 3D fitting tool to derive the kinematics of galaxies from emission-line observations.
http://editeodoro.github.io/Bbarolo/
GNU General Public License v2.0
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the PA of the outermost ring becomes negative #36

Closed BGZJie closed 9 months ago

BGZJie commented 9 months ago

After I gave BBarolo my initial guesses of PA and inclination, BBarolo gave me a result that the PA of the outmost ring is approximately -280(which I gave 80). Then BBarolo tried to fit -280 into the whole bezier function and made the output pdf look strange. I wonder how to solve the problem. maps_local.pdf parameters.pdf

editeodoro commented 9 months ago

Hello, this is very strange indeed! Would you mind attaching your datacube and parameters, so I can try to figure out what is going wrong?

Thanks, Enrico

editeodoro commented 9 months ago

I've got the data and deleted your previous message (otherwise, anyone would have been able to download your data!). I'll let you know asap.

editeodoro commented 9 months ago

Hello, I have investigated the problem and found a little bug that causes the behaviour that you describe. I'll need to fix it, but it may take a few days. In the meanwhile, as a workaround, you can just avoid this problem by explicitly giving all the input parameters for the rings in the parameter file. In the example that you sent, the VROT and VDISP were commented out, so the code was trying to estimate them, and that triggered the error with the PA. Just give some values for them and the code should run ok.

Let me know if this does not solve the issue. Cheers, Enrico

BGZJie commented 9 months ago

After I gave initial estimates of VROT, the problem was solved. Thank you so much!