Journal Article

Statistical properties of the dark matter haloes of dwarf galaxies and correlations with the environment

A. Del Popolo and V. F. Cardone

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 423, issue 2, pages 1060-1072
Published in print June 2012 | ISSN: 0035-8711
Published online June 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.20936.x
Statistical properties of the dark matter haloes of dwarf galaxies and correlations with the environment

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According to the now strongly supported concordance Λ cold dark matter model, galaxies may be grossly described as a luminous component embedded in a dark matter halo. The density profile of these mass-dominating haloes may be determined by N-body simulations which mimic the evolution of the tiny initial density perturbations during the process leading to the structures we observe today. Unfortunately, when the effect of baryons is taken into account, the situation gets much more complicated due to the difficulties in simulating their physics. As a consequence, a definitive prediction of how dark matter haloes should presently look is still missing. We revisit here this issue from an observational point of view devoting our attention to dwarf galaxies. Being likely dark matter dominated, these systems are ideal candidates to investigate the present-day halo density profiles and check whether dark matter related quantities correlate with stellar ones or the environment. By fitting a large sample of well-measured rotation curves, we infer constraints on both halo structural parameters (such as the logarithmic slope of the density profile and its concentration) and derived quantities (e.g. the mass fraction and the Newtonian acceleration) which could then be used to constrain galaxy formation scenarios. Moreover, we investigate whether the halo properties correlate with the environment the galaxy lives in, thus offering a new tool to deepen our understanding of galaxy formation.

Keywords: galaxies: kinematics and dynamics; galaxies: spiral; dark matter

Journal Article.  9775 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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