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The mass distribution in Spiral galaxies

Published online by Cambridge University Press:  01 June 2007

Paolo Salucci
Paolo Salucci*
Affiliation:
SISSA, Via Beirut, 2-4, 34100 Trieste, Italy email: salucci@sissa.it
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Abstract

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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 ΛCDM Cosmology to evolve to match the challenge that observations presently pose.

Keywords

dark mattergalaxies: formationgalaxies: kinematics and dynamics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S244: Dark Galaxies and Lost Baryons , June 2007 , pp. 53 - 62
Copyright
Copyright © International Astronomical Union 2008

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