This article has an erratum: [https://doi.org/10.1051/0004-6361/201323059e]
Volume 563, March 2014
|Number of page(s)||5|
|Published online||17 March 2014|
A new fitting-function to describe the time evolution of a galaxy’s gravitational potential
Kapteyn Astronomical Institute, University of Groningen,
PO Box 800,
Accepted: 19 January 2014
We present a new simple functional form to model the evolution of a spherical mass distribution in a cosmological context. Two parameters control the growth of the system and this is modelled using a redshift-dependent exponential for the scale mass and scale radius. In this new model, systems form inside out and the mass of a given shell can be made never to decrease, as generally expected. This feature makes it more suitable for studying the smooth growth of galactic potentials or cosmological halos than other parametrizations often used in the literature. This is further confirmed through a comparison to the growth of dark matter halos in the Aquarius simulations.
Key words: galaxies: evolution / dark matter
© ESO, 2014
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