Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-07-30
Astronomy and Astrophysics
Astrophysics
10 pages, Invited review for IAU Symposium 244, Dark Galaxies & Lost Baryons. Typos corrected. Comments are welcome
Scientific paper
10.1017/S174392130701383X
In the past years a wealth of observations has allowed us to unravel the structural properties of the Dark and Luminous mass distribution in spirals. As result, it has been found that their rotation curves follow, out their virial radius, an Universal function (URC) made by two terms: one due to the gravitational potential of a Freeman stellar disk and the other due to that of a dark halo. The importance of the latter is found to decrease with galaxy mass. Individual objects reveal in detail that dark halos have a density core, whose size correlates with its central value. These properties will guide $\Lambda$CDM Cosmology to evolve to match the challenge that observations presently pose.
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