Emission maps

[cgarling]

Great work here, I am enjoying reading your 2017 paper at the moment.

I am interested in creating emission maps for ions like H-alpha to emulate observations of warm/hot outflows driven by supernovae (e.g., Figure 4 in Marasco+2023). It seems that trident contains many of the necessary ingredients to model emission spectra between the ion_balance module, the LightRay object, and the Voigt profile injection. In the inner regions of galaxies you would have to worry about obscuration by the HI disk, which would require modelling both emission and absorption, but once you are in the optically thin CGM the problem should be simpler.

Has there been any work done on emission spectra with trident? If not, would anyone be interested in collaborating to add this functionality?

[chummels]

Hi Chris. Good idea! I recently was awarded a NASA grant to indeed implement this in Trident, and it's something that I'm actively working on. We're in the process of identifying which lines to include emissivities for, but H-alpha will definitely be among them. I anticipate it being available and ready to work by the end of the year. You'll see updates on the Trident github and slack channel as this progresses. I'm happy to discuss as well.

[cgarling]

Great news, and thanks for the quick reply! Is there a NASA grant number or ADS bibcode I can reference for this work?

[chummels]

There is no ADS bibcode yet, but it's NASA Astrophysics Decadal Survey Precursor Science grant #80NSSC23K1515 "Defining Science Requirements for Galaxy Formation and Evolution Across the UV and X-ray Wavebands with Synthetic Observations."

[chummels]

And for reference, there has been some previous work on this front using a trident-like code by Lauren Corlies and the FOGGIE group. To my knowledge this code was never made public. Our current efforts will be similar to this but we will ultimately provide the tools to the public through the existing trident interface.

https://ui.adsabs.harvard.edu/abs/2020ApJ...896..125C/abstract

[cgarling]

Do you think you can calculate emissivities on the fly with something like PyNeb or would you favor using lookup tables like in the FOGGIE II paper you've linked? I imagine the lookup tables would be more efficient.

P.S. I sent info on a collaboration opportunity to the gmail address listed on your github page. No worries if you haven't had time to reply, but I wanted to make sure you received it.

[chummels]

Both are options. We're planning to test both to see which is most efficient, however, I think the lookup tables will indeed be the best solution.

I haven't had a chance to respond to your email, but I will today.