Multiple spectra

[bd-j]

Allow for multiple spectra to be fit, potentially sharing some parameters.

[dawnerb]

I'm interested in something like this. We have two things that are well-separated in some photometric bands but hopelessly confused in others, and it would be useful to be able to fit them simultaneously, with the constraint that for the bands where the objects aren't resolved the individual fluxes add up to the total. Any chance of a capability like this being added?

[bd-j]

I'm working on multiple spectra/multiple photometry functionality, though it's in the background and at least a month away. But I haven't focused the sharing parameters functionality, which it sounds like you'd need.

I did make an early attempt to do something like what you suggest here:
https://github.com/bd-j/prospector/blob/main/prospect/sources/galaxy_basis.py#L125
but it only works for the parametric SFHs and needs to be documented and updated to work with SpecModel objects.

[bd-j]

PS Doing this kind of fit for SFHs beyond the composite/parametric SFHs would really require a more general facility for multi-source simultaneous fitting, which is not currently in the plans; the multiple spectra referred to by this issue was only meant to handle the case of multiple spectra of the same source (sharing physical parameters, but not instrumental parameters)

[dawnerb]

I see, yes, this is for multiple sources. It would be for a very simple SFH for both sources, so I don't think the SFH part would be a big issue at least for what I'm trying to do. I'll check out your link, thanks.