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The structural complexity of the dwarf galaxies of the Local Group

Published online by Cambridge University Press:  01 December 2006

Alan W. McConnachie
Affiliation:
Dept. of Physics and Astronomy, University of Victoria, Victoria, B.C., V8P 1A1, Canada email: alan@uvic.ca
Nobuo Arimoto
Affiliation:
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
Mike J. Irwin
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge, CB3 0HA, U.K.
Corresponding
E-mail address:
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Abstract

We have undertaken a large, multi-colour, photometric, survey of distant (D > 500 kpc) Local Group dwarf galaxies with the Subaru SuprimeCam wide field camera. These data reach to below the horizontal branch level of these systems, to a depth equivalent to earlier HST WFPC2 studies but over an area ∼ 100 times larger, making them ideal for studies of the global stellar content and structural characteristics of these systems. All eight of our targets show radial gradients and spatially distinct, multiple structural components. This implies that dwarf galaxies in general possess multiple stellar components, akin to larger galaxies. Dynamical models of these systems which do not account independently and consistently for each individual density component may be limited in their applicability.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2007

References

Da Costa, G. S., Armandroff, T. E., Caldwell, N., & Seitzer, P. 2000, AJ, 119, 705CrossRefGoogle Scholar
McConnachie, A. W., Arimoto, N., & Irwin, M. 2007a, MNRAS, submittedGoogle Scholar
McConnachie, A. W., Arimoto, N., & Irwin, M. 2007b, ApJL, submittedGoogle Scholar
McConnachie, A. W. et al. , 2004, MNRAS, 350, 243CrossRefGoogle Scholar
McConnachie, A. W. et al. , 2005, MNRAS, 356, 979CrossRefGoogle Scholar
McConnachie, A. W., Arimoto, N., Irwin, M., & Tolstoy, E. 2006, MNRAS, 373, 715CrossRefGoogle Scholar
McConnachie, A. W., & Irwin, M. J. 2006, MNRAS, 365, 1263CrossRefGoogle Scholar
McConnachie, A. W., & Irwin, M. J. 2006, MNRAS, 365, 902CrossRefGoogle Scholar
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