Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-12-04
Astronomy and Astrophysics
Astrophysics
Accepted for publication in MNRAS; small problem with figure numbering fixed
Scientific paper
10.1046/j.1365-8711.2003.06330.x
Low Surface Brightness (LSB) 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 halos 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 compare the results with observed mass-density profiles. Our simulations suggest that no single systematic effect can reconcile the data with the cuspy CDM halos. The data are best described by a model with a soft core with an inner power-law mass-density slope alpha = -0.2 +/- 0.2. However, no single universal halo profile provides a completely adequate description of the data.
Bosma Albert
de Blok J. G. W.
McGaugh Stacy S.
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