Multicolour-metallicity Relations from Globular Clusters in NGC 4486 (M87)

We present Gemini griz′ photometry for 521 globular cluster (GC) candidates in a 5.5 × 5.5 arcmin2 field centred 3.8 arcmin to the south and 0.9 arcmin to the west of the centre of the giant elliptical galaxy NGC 4486. All these objects have previously published (C − T1) photometry. We also present new (C − T1) photometry for 338 globulars, within 1.7 arcmin in galactocentric radius, which have (g...