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2013MNRAS.433.2314H - Mon. Not. R. Astron. Soc., 433, 2314-2333 (2013/August-2)
Dark matter in disc galaxies - I. A Markov Chain Monte Carlo method and application to DDO 154.
HAGUE P.R. and WILKINSON M.I.
Abstract (from CDS):
We apply our method to observed data for the dwarf irregular galaxy DDO 154 and recover a logarithmic halo slope of -0.39±0.11 at a radius of 0.14kpc. Our analysis validates earlier estimates which were based on the fitting of a limited set of individual halo models, but constitutes a more robust constraint than was possible using other techniques since it marginalizes over a wide range of halo profiles. Our method can thus reproduce existing results, has been verified on test data, and is shown to be capable of providing more information than is available from fitting individual halo profiles. The likely impact of future improvements in data quality on rotation curve decomposition using this technique is also discussed. We find that velocity errors are a limiting factor on the constraint that can be found, while spatial resolution is not.
Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)
Journal keyword(s): methods: analytical - methods: statistical - galaxies: evolution - galaxies: formation - galaxies: structure - dark matter
Simbad objects: 5
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