Public Data Access Overview / Discussion Forum

Hi Dylan,

I am using the synthetic photometry from (k) SDSS ugriz and UVJ Photometry/Colors with Dust and I have a question (maybe you mentioned it but I can't find it).

What are the cosmological parameters used when creating this synthetic photometry catalog? I want to compare the synthetic photometry with real ones from SDSS, so I need to convert them into the same cosmology (especially the same little h).

Thanks,
Zeyu

Those assume the same h value as the TNG simulations do, you find it under the Background information.

I think this idea of "converting to the same cosmology" is probably not the best anymore. A hydrodynamical simulation like TNG is run with a specific cosmology. If you changed the cosmology, the results of the simulation would be different (in complex, non-linear ways). It is, therefore, not really possible to convert e.g. stellar photometry to a different cosmology.

Thank you for your reply and suggestion. I think you are right.

Thanks,
Zeyu