[yt-users] Fitting an absorption spectrum

[Pengfei Chen]

Hi Hilary,

Thank you! I'm looking forward to it.

Pengfei


On Thu, Feb 13, 2014 at 7:32 PM, Hilary Egan <hilaryye at gmail.com> wrote:

> 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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