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We have used Suprime-Cam on the Subaru Telescope to conduct a V- and I-bandimaging survey of fields sampling the spheroid of the Andromeda galaxy alongits south-east minor axis. Our photometric data are deep enough to resolvestars down to the red clump. Based on a large and reliable sample of red giantstars available from this deep wide-field imager, we have derived metallicitydistributions vs. radius and a surface brightness profile over projecteddistances of R=23-66 kpc from the galaxy's center. The metallicitydistributions across this region shows a clear high mean metallicity and abroad distribution ([Fe/H] ~ -0.6 +/- 0.5), and indicates no metallicitygradient within our observed range. The surface brightness profile at R>40 kpcis found to be flatter than previously thought. It is conceivable that thispart of the halo samples as yet unidentified, metal-rich substructure.

A Subaru/Suprime-Cam Survey of M31's spheroid along the South-East minor axis