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Abstract: Recent analysis of the Milky Way-s satellite galaxies reveals that theseobjects share a common central mass density, even though their luminositiesrange over five orders of magnitude. This observation can be understood in thecontext of galaxy formation theory by quantifying the factors which restrictthe central mass density to a small range. One limit is set by the maximum massthat can collapse into a given region by the hierarchical growth of structurein the standard cold dark matter cosmology. Another limit comes from thenatural thresholds which exist for gas to be able to cool and form a galaxy.The wide range of luminosities in these satellites reflect the effects ofsupernova feedback on the fraction of cooled baryons which are retained.



Author: Martin Stringer, Shaun Cole, Carlos Frenk

Source: https://arxiv.org/



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