Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20516903m&link_type=abstract
American Astronomical Society Meeting 205, #169.03; Bulletin of the American Astronomical Society, Vol. 36, p.1622
Astronomy and Astrophysics
Astronomy
Scientific paper
We have obtained imaging of all the dwarf spheroidal satellites of the Andromeda Galaxy, and analysed their morphology via resolved star counts. A startling variety in their structure is seen. In particular all but a few show strong evidence of tidal disruption. This is most spectacularly demonstrated by Andromeda I, whose isopleths show clear evidence of extended tidal tails. Even more surprising than this, however, is the structure of Andromeda II, where central star counts clearly require a two component stellar model to explain the data. Taken in conjunction with recent results on Galactic dwarf spheroidals, this suggests that dwarf spheroidal galaxies are not the simple dynamical systems that we have assumed. Implications for their derived properties, formation and subsequent evolution will be discussed.
Ferguson Annette Mairi Nelson
Ibata Rodrigo A.
Irwin Mary Jane
Lewis Geraint F.
McConnachie Alan W.
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