sdssflux2ab

pydl.photoop.sdssio.sdssflux2ab(flux, magnitude=False, ivar=False)[source]

Convert the SDSS calibrated fluxes (magnitudes) into AB fluxes (magnitudes).

Parameters:

flux : numpy.ndarray

Array of calibrated fluxes or SDSS magnitudes with 5 columns, corresponding to the 5 filters u, g, r, i, z.

magnitude : bool, optional

If set to True, then assume flux are SDSS magnitudes instead of linear flux units.

ivar : numpy.ndarray, optional

If set, the input fluxes are actually inverse variances.
Returns:

numpy.ndarray

Array of fluxes or magnitudes on the AB system.

Notes

Uses the conversions posted by D.Hogg (sdss-calib/845):

u(AB,2.5m) = u(2.5m) - 0.042
g(AB,2.5m) = g(2.5m) + 0.036
r(AB,2.5m) = r(2.5m) + 0.015
i(AB,2.5m) = i(2.5m) + 0.013
z(AB,2.5m) = z(2.5m) - 0.002