[yt-users] Cosmological parameters necessary to run synthetic spectrum?

[Nicholas Earl]

Thanks, everyone, for the responses.

It is as Brian has said: I am dealing specifically with the case of an
absorption spectrum generator. The simulation is indeed idealized and
non-cosmological.

Attempting to load the data and pass it to SpectrumBuilder yields the
'CosmologyInitialRedshift' KeyError seen here
http://paste.yt-project.org/show/5248/. Editing the sfr_spectrum.py file to
accept hard-coded values (for the omegas and initial redshift) yields a
second KeyError seen here http://paste.yt-project.org/show/5249/.

As per Nathan's suggestion, I will give the yt-3.0 version of the generator
a go in the mean time.

Thanks again for your guys' attention,
Nick

On Mon Dec 08 2014 at 5:19:21 PM Cameron Hummels <chummels at gmail.com> wrote:

> I've used the code on individual blobs of gas in an ambient medium with
> short sightlines, but I used it on sim outputs that were cosmological.  I
> think it would be relatively straightforward to generalize the code to
> allow one to *set* the cosmological parameters, instead of reading those
> values from the dataset.  I think Britton would be the main person to
> answer these questions, but I'll take a look at it this evening and see how
> hard this might be.
>
> Cameron
>
> On Mon, Dec 8, 2014 at 2:59 PM, Nathan Goldbaum <nathan12343 at gmail.com>
> wrote:
>
>> Hi Brian and Nick,
>>
>> Can you share with us the errors you're seeing?
>>
>> It's likely that no one has tried to do what you're doing before.  To get
>> it to work, it might just be necessary to make some adjustments to the
>> absorption spectrum machinery in the case when we detect a non-cosmological
>> dataset. That will require making some modifications to yt, but that's ok!
>>
>> It looks like the absorption spectrum analysis module *has* seen some
>> updates for yt-3.0, so you may also want to try again in the latest version
>> of the codebase.  I haven't personally used it - it looks like Hillary Egan
>> was the last person to touch the code.
>>
>> -Nathan
>>
>> On Mon Dec 08 2014 at 1:52:15 PM Brian O'Shea <bwoshea at gmail.com> wrote:
>>
>>> Hi folks,
>>>
>>> Just to send a quick followup on this: Nick is referring specifically to
>>> the *absorption spectrum* generator, and he is trying to make spectra of
>>> idealized, non-cosmological simulations (think a blob in an ambient medium)
>>> that has no redshift as a simulation parameter.  The question is, how does
>>> one do this?
>>>
>>> Cheers,
>>> Brian
>>>
>>>
>>> On Mon, Dec 8, 2014 at 11:59 AM, Nicholas Earl <nchlsearl at gmail.com>
>>> wrote:
>>>
>>>> Hey everyone,
>>>>
>>>> Is there a way to fake the cosmological parameters that the synthetic
>>>> spectrum generator looks for in a simulation? Or rather, a "sanctioned"
>>>> way? Having the package reference hardcoded values when the parameters
>>>> themselves are not found yields other missing fields like 'creation_time'.
>>>> I am wondering if this is a consequence of the simulation not being
>>>> inherently cosmological?
>>>>
>>>> I am using yt 2.x currently, as I'm aware that there seems to be an
>>>> issue with the generator in the 3.0 release.
>>>>
>>>> Thanks for your time,
>>>> Nick
>>>>
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>
>
> --
> Cameron Hummels
> Postdoctoral Researcher
> Steward Observatory
> University of Arizona
> http://chummels.org
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