AAS 204th Meeting, June 2004
Session 17 Galaxies Including Our Own
Oral, Monday, May 31, 2004, 10:00-11:30am, 710/712

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[17.06] The Lowest Luminosity Galaxy Yet: Andromeda IX, a New Satellite of M31

D. B. Zucker, A. Y. Kniazev, E. F. Bell, D. Martinez-Delgado, H. W. Rix (Max-Planck-Institute for Astronomy), E. K. Grebel (University of Basel), C. M. Rockosi (University of Washington), J. A. Holtzman, R. A. M. Walterbos (New Mexico State University)

We report the discovery of a new dwarf spheroidal satellite of M31, Andromeda IX, based on resolved stellar photometry from the Sloan Digital Sky Survey (SDSS). We have estimated its distance and other physical properties, and compared these to the properties of a previously known dwarf spheroidal companion, Andromeda V, also observed by SDSS. Based on our measurements, Andromeda IX is the lowest surface brightness galaxy found to date (\muV,0 ~ 27.0 mag arcsec-2), and, given its distance, (m - M)0 ~24.5 (805 kpc), Andromeda IX is the faintest galaxy as well (MV ~-8.3).

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