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

[Cameron Hummels]

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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