Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-03-30
Astrophys.Space Sci. 276 (2001) 375-382
Astronomy and Astrophysics
Astrophysics
8 pages, 2 Postscript figures. To appear in the proceedings of the Euroconference "The Evolution of Galaxies on Cosmological T
Scientific paper
10.1023/A:1017562225479
We study the evolution of galaxy satellites with high resolution N-body simulations. Satellites are modeled as replicas of typical low and high surface brightness galaxies (LSBs and HSBs). Encounters on high eccentricity orbits (as typical in hierarchical models of galaxy formation) strip LSBs of most of their stars and tend to decrease their surface brightness. On the contrary, bar instability in HSBs leads to substantial loss of angular momentum of the stellar component and to an increase of central surface brightness. In both cases the remnant resembles a spheroidal galaxy with an exponential surface brightness profile. A simple modeling of color evolution and interactions driven star formation gives M/L ratios for the remnants that are roughly consistent with observations. These results suggest an evolutionary scenario for the dwarf galaxies in our Local Group, faint dSphs being the descendents of LSBs and brighter dSphs/dEs being the final state of HSB satellites.
Baugh Carlton M.
Colpi Monica
Governato Fabio
Mayer Lucio
Moore Ben
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