2003MNRAS.340..657D -
Mon. Not. R. Astron. Soc., 340, 657-678 (2003/April-1)
Simulating observations of dark matter dominated galaxies: towards the optimal halo profile.
DE BLOK W.J.G., BOSMA A. and McGAUGH S.
Abstract (from CDS):
Low surface brightness galaxies are dominated by dark matter, and their rotation curves thus reflect their dark matter distribution. Recent high-resolution rotation curves suggest that their dark matter mass-density distributions are dominated by a constant-density core. This seems inconsistent with the predictions of cold dark matter (CDM) models which produce haloes with compact density cusps and steep mass-density profiles. However, the observationally determined mass profiles may be affected by non-circular motions, asymmetries and offsets between optical and dynamical centres, all of which tend to lower the observed slopes. Here we determine the impact of each of these effects on a variety of halo models, and we compare the results with observed mass-density profiles. Our simulations suggest that no single systematic effect can reconcile the data with the cuspy CDM haloes. The data are best described by a model with a soft core with an inner power-law mass-density slope α=-0.2 ±0.2. However, no single universal halo profile provides a completely adequate description of the data.
Abstract Copyright:
2003 RAS
Journal keyword(s):
galaxies: fundamental parameters - galaxies: kinematics and dynamics - dark matter
Simbad objects:
33
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