Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-11-20
Astronomy and Astrophysics
Astrophysics
Proceedings IAU 220 "Dark Matter in Galaxies", Eds. S. Ryder et al
Scientific paper
Systematic effects on HI and Halpha long-slit observations make a measurement of the inner slope of the dark matter density distribution difficult to determine. Halos with constant density cores and ones with r^-1 profiles both appear consistent with the data, although constant density cores generally provide better fits. High-resolution, two-dimensional velocity fields remove most of the systematic effects, yet as a result of noncircular and random motions the inner slopes still cannot be accurately measured. Halo concentration parameters provide a more useful test of cosmological models because they are more tightly constrained by observations. The concentration parameters for LSB galaxies appear consistent with, but on the low end of the distribution predicted by CDM.
Andersen David R.
Bershady Matthew A.
Swaters Rob A.
Verheijen Marc A. W.
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