Consequences of Satellite Decay for Galaxy Halo Shapes

Details Consequences of Satellite Decay for Galaxy Halo Shapes Consequences of Satellite Decay for Galaxy Halo Shapes

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002sgdh.conf..226v&link_type=abstract

THE SHAPES OF GALAXIES AND THEIR DARK HALOS. Proceedings of the Yale Cosmology Workshop. Held 28-30 May 2001 in New Haven, Conne

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High resolution N-body simulations show a high abundance of galaxy satellites, which is not seen observationally. It appears that too many subhalos survive in simulated galaxy halos. One likely cause for this is that dynamical friction is not properly simulated yet, not even for the highest resolution simulations to date, resulting in an "undermerging" problem. Another issue that can be resolved by properly simulating dynamical friction is the cuspiness of N-body halos. The orbital energy loss suffered by satellites causes their parent halo to heat up. This heating up can transform a central cusp into a core, especially if this heating is actually most efficient in the center. The orbital decay of a sufficient number of galaxy satellites can therefore, when properly simulated, resolve both issues.

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