AAS 203rd Meeting, January 2004
Session 116 Elliptical and Spiral Galaxies
Poster, Thursday, January 8, 2004, 9:20am-4:00pm, Grand Hall

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[116.14] A Keck Survey of the M31 Halo

P. Cote, A. Sluis (Rutgers University), P. Durrell (Penn State University), R.M. Rich (UCLA), K.C. Freeman (Mt Stromlo)

At a distance of 760 kpc, M31 presents us with a unique opportunity to the spatial structure, chemical enrichment history, star formation history, and dynamical properties of the stellar halo belonging to a second large spiral galaxy. Recent imaging of M31 with HST has produced a surprise: a substantial intermediate-age population in a single halo field at a distance of 11 kpc from the galaxy's center. In this poster, we present preliminary results from a photometric and spectroscopic study -- using LRIS on the Keck telescope -- of three, 40 sq. arcminute halo fields at galactocentric distances of 27 kpc.

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Bulletin of the American Astronomical Society, 35#5
© 2003. The American Astronomical Soceity.