Volume 498, Number 2, May I 2009
|Page(s)||615 - 626|
|Published online||18 February 2009|
Total mass distributions of Sersic galaxies from photometry and central velocity dispersion
School of Physics & Astronomy, University of Nottingham, Nottingham NG7 2RD, UK e-mail: dalia.chakrabarty$@$nottingham.ac.uk
2 Institute for Astronomy, University of Edinburgh, Blackford Hill, Edinburgh EH9 3HJ, UK e-mail: firstname.lastname@example.org
Accepted: 7 February 2009
Aims. We develop a novel way of finding total mass density profiles in Sersic ellipticals, to about 3 times the major axis effective radius, using no other information other than what is typically available for distant galaxies, namely the observed surface brightness distribution and the central velocity dispersion .
Methods. The luminosity density profile of the observed galaxy is extracted by deprojecting the measured brightness distribution and scaling it by a fiduciary, step-function shaped, raw mass-to-light ratio profile (). The resulting raw, discontinuous, total, 3-D mass density profile is then smoothed according to a proposed smoothing prescription. The parameters of this raw are characterised by implementing the observables in a model-based study.
Results. The complete characterisation of the formalism is provided as a function of the measurements of the brightness distribution and . The formalism, thus specified, is demonstrated to yield the mass density profiles of a suite of test galaxies and is successfully applied to extract the gravitational mass distribution in NGC 3379 and NGC 4499, out to about 3 effective radii.
Key words: methods: data analysis / galaxies: fundamental parameters
© ESO, 2009
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