Astronomy and Astrophysics – Astronomy
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.4601f&link_type=abstract
American Astronomical Society, 200th AAS Meeting, #46.01; Bulletin of the American Astronomical Society, Vol. 34, p.716
Astronomy and Astrophysics
Astronomy
Scientific paper
We report results from our ongoing survey of the outer disk and halo of M31 with the Wide-Field Camera on the INT 2.5m. To date, we have mapped a region of ~ 25 square degrees centered on M31, extending out to a major axis radius of ~ 55 kpc. The contiguous nature of our survey allows the first uninterrupted study of the density and colour distribution of individual red giant branch stars. We find evidence for both spatial density and metallicity variations, which are often, but not always, correlated. In addition to the previously-reported giant stellar stream (Ibata et al 2001), our data reveal the presence of significant stellar overdensities at large radii close to the south-western major axis, in the proximity of the luminous globular cluster G1, and near the north-eastern major axis, coinciding with and extending beyond the previously-known `northern spur'. Additional lower-level overdensities are seen at various locations. We discuss the possible origin of these large-scale inhomogeneities and the implications for constraining the galaxy assembly process.
Ferguson Annette Mairi Nelson
Ibata Rodrigo A.
Irwin Mary Jane
Lewis Geraint F.
Tanvir Nial R.
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