Converting GALEX magnitudes

jhargisjhargis Member, Administrator, Institute_Staff, Moderator_MAST, Admin_MAST Posts: 30 admin
How to I convert from GALEX instrumental magnitudes to AB magnitudes?
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  • scflemingscfleming Member, Institute_Staff, Moderator_MAST, Admin_MAST Posts: 35
    Most of the "mag" columns are in instrumental magnitudes. To convert to AB magnitudes, add 18.82 for FUV and 20.08 for NUV. For example, to get the NUV flux of a source using the "aper_5" fixed-radius aperture: ab_mag = NUV_MAG_APER_5 + 20.08. One exception are the "fuv_mag" and "nuv_mag" columns, which are already in AB magnitudes, for convenience.
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