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I can't find the units for the columns auto_flux_BAND or really any of the flux columns in the table.
asked May 6, 2020 by anonymous | 167 views

1 Answer

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answered May 6, 2020 by ascott (720 points)
Thank you for you quick response. Is there a conversion to get ADUs into an actual flux unit? Without the gain or exposure time I am not sure what to do with a flux in ADUs.
Hi there, so Adam is right that the units of the flux columns are ADUs (we should add that to the column descriptions), i.e. they are counts; to convert to electrons you can use the DECam gain, ~4 e-/ADU.  But the magnitudes are on the AB system, so to get linear physical flux from the magnitudes you can convert through the AB mag definition, e.g.: https://en.wikipedia.org/wiki/AB_magnitude.  I think this is probably what you want to use.
Thanks for getting back to me. I was able to used the magnitudes to get a flux and then used the S/N of the ADU flux and error to get a flux error in flux units.
Great!  You could also convert mag errors to flux errors through 1.086*sigma_flux/flux = sigma_mag

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