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Simulating observations of dark matter dominated galaxies: towards the optimal halo profile

Identifieur interne : 001A97 ( Istex/Checkpoint ); précédent : 001A96; suivant : 001A98

Simulating observations of dark matter dominated galaxies: towards the optimal halo profile

Auteurs : W. J. G. De Blok [Australie, Royaume-Uni] ; Albert Bosma [France] ; Stacy Mcgaugh [États-Unis]

Source :

RBID : ISTEX:5B46009C6CE3C9F24B99D32D464777784EAC6388

Descripteurs français

English descriptors

Abstract

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.

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DOI: 10.1046/j.1365-8711.2003.06330.x


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ISTEX:5B46009C6CE3C9F24B99D32D464777784EAC6388

Le document en format XML

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