Galaxy infrared colour magnitude relations

Abstract
Infrared colour–absolute magnitude relations are presented for samples of spiral, and elliptical and SO galaxies, using published data of Aaronson, Huchra & Mould and Frogel, Persson & Aaronson. The behaviours of ellipticals and spirals are shown to be manifestly different. The spiral colour–absolute magnitude relationship is proposed as a distance indicator.

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