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desihub / fastspecfit

Fast spectral synthesis and emission-line fitting of DESI spectra.
https://fastspecfit.readthedocs.org
BSD 3-Clause "New" or "Revised" License
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consider adopting the fiducial DESI cosmology #88

Closed moustakas closed 1 year ago

moustakas commented 1 year ago

fastphot currently uses a vanilla LCDM cosmology with h=0.7 to compute luminosity distances. Consider adopting the fiducial DESI cosmology to make it easier to map between data and mocks-- https://desi.lbl.gov/trac/wiki/keyprojects#Fiducialcosmology

moustakas commented 1 year ago

Per a suggestion from @ashleyjross, one option would be to move LSS.tabulated_cosmo.TabulatedDESI into fastspecfit (as well as https://github.com/desihub/LSS/blob/main/py/LSS/data/desi_fiducial_cosmology.dat) and then do something like

cosmo = TabulatedDESI()
dis_dc = cosmo.comoving_radial_distance
def dl(z):   # Luminosity distance from now to z
    return dis_dc(z)*(1.+z)
moustakas commented 1 year ago

Done in #96.