Photometric aperture sizes

jhargisjhargis Member, Administrator, Institute_Staff, Moderator_MAST, Admin_MAST Posts: 30 admin
edited May 2016 in GALEX
What sizes (in arcseconds) do the various *_APER_# columns correspond to?
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  • scflemingscfleming Member, Institute_Staff, Moderator_MAST, Admin_MAST Posts: 35
    edited January 13
    The syntax for the various "*_aper_#" columns represent the number of pixels used as the aperture DIAMETER. They are numbered as "aper_{1,2,3,4,5,6,7}", and correspond to diameters of {2,3,5,8,12,17,23} pixels, respectively. For example, the "*_aper_5" columns correspond to an aperture size of 12 pixels in diameter. One GALEX pixel = 1.5 arcseconds, so this corresponds to an 18 arcsecond diameter aperture (9 arcsecond radius aperture).
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