[yt-users] Fitting an absorption spectrum

[Hilary Egan]

Hi Pengfei,

I have a fix for this issue that just needs a little more testing! I'll
push it shortly and reply to this message when it's been accepted.

-Hilary


On Thu, Feb 13, 2014 at 8:04 PM, Pengfei Chen <madcpf at gmail.com> wrote:

> Hi all,
>
> I've used the
>
> yt.analysis_modules.absorption_spectrum.absorption_spectrum_fit
>
> script to fit an Lya absorption spectrum generated by yt.
>
> But there are some abnormal peaks when I did statistics of line width b
> and column density N. Two figures are attached. I've tried with different
> redshifts and all of them had peaks in b-distribution at init_b (which is
> 40km/s here) and maxb(which is 300km/s here). For the N-distribution I got
> peaks around 10^12 cm^-2 at every redshift. The parameters I used were:
>
> HI_parameters = {'name':'HI',
>                  'f': [.4164],
>                  'Gamma':[6.265E8],
>                  'wavelength':[1215.67],
>                  'numLines':1,
>                  'maxN': 1E22, 'minN':1E11,
>                  'maxb': 300, 'minb':1,
>                  'maxz': 5, 'minz':0,
>                  'init_b':40,
>                  'init_N':1E14}
>
> Could someone please tell me how to solve this? All the analysis were done
> with the latest development version of yt and I made no changes to the
> source code.
>
> Please tell me if you need any datasets.
>
> Thank you!
> Pengfei
>
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>
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