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Simulating Observations of Dark Matter Dominated Galaxies: Towards the Optimal Halo Profile | W.J.G. de Blok
; A. Bosma
; S.S. McGaugh
; | Date: |
4 Dec 2002 | Subject: | astro-ph | Affiliation: | Cardiff University, UK, Observatoire de Marseille, France, Univ of Maryland, USA | Abstract: | 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. | Source: | arXiv, astro-ph/0212102 | Services: | Forum | Review | PDF | Favorites |
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