Journal Article

Secondary infall model and dark matter scaling relations in intermediate-redshift early-type galaxies

V. F. Cardone, A. Del Popolo, C. Tortora and N. R. Napolitano

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 416, issue 3, pages 1822-1835
Published in print September 2011 | ISSN: 0035-8711
Published online September 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19162.x
Secondary infall model and dark matter scaling relations in intermediate-redshift early-type galaxies

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Scaling relations among dark matter (DM) and stellar quantities are a valuable tool to constrain formation scenarios and the evolution of galactic structures. However, most of the DM properties are actually not directly measured, but derived through model-dependent mass-mapping procedures. It is therefore crucial to adopt theoretically and observationally well founded models. We use here an updated version of the secondary infall model (SIM) to predict the halo density profile, taking into account the effects of angular momentum, dissipative friction and baryons collapse. The resulting family of halo profiles depends only on one parameter, the virial mass, and nicely fits the projected mass and aperture velocity dispersion of a sample of intermediate redshift lens galaxies. We derive DM-related quantities (namely the column density and the Newtonian acceleration) and investigate their correlations with stellar mass, luminosity, effective radius and virial mass.

Keywords: galaxies: elliptical and lenticulars, cD; galaxies: formation; galaxies: kinematics and dynamics; dark matter

Journal Article.  12061 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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