Re: help@legacysurvey.org

[Dustin Lang]

Hi,

Yes, the galaxy profiles fit an elliptical shape model -- see shape_r, shape_e1, shape_e2.  (And sersic).

cheers,

dustin

On Tue, Jul 25, 2023 at 5:05 PM Derrick Carr <derric...@gmail.com> wrote:

Hey,

I'm a PhD student who was hoping to utilize DECALs as a part of my dissertation within the upcoming months. In short, I am doing a structural analysis on compact galaxies. DECALs appears to utilize models to assign sources as a type (e.g. Sersic, PSF). Are there any plans to release further structural information that would also be output from a light profile model, such as axial ratios?

Thanks,

Derrick

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[Derrick Carr]

Thanks, I re-wrote the question to make it more clear. Hopefully you can briefly reply to that too. In particular, some parameters I would be very interested in having are b/a axial ratios and bulge-to-disk flux ratios. 

[Dustin Lang]

If you read about the shape params you'll see how to compute b/a

https://www.legacysurvey.org/dr9/catalogs/#ellipticities

We don't have bulge-to-disk because we don't compute those composite models in DR9 -- we used to in previous releases but we switched to a Sersic model instead.

cheers,

dustin

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