Dark matter scaling relations in intermediate z haloes

We investigate scaling relations between the dark matter (DM) halo model parameters for a sample of intermediate-redshift early-type galaxies (ETGs) resorting to a combined analysis of Einstein radii and aperture velocity dispersions. Modelling the dark halo with a Navarro–Frenk–White profile and as...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2010-12, Vol.409 (4), p.1570-1576
Main Authors: Cardone, V. F., Tortora, C.
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics
Dark matter
Earth, ocean, space
Exact sciences and technology
galaxies: elliptical and lenticular
galaxies: elliptical and lenticular, cD
galaxies: kinematics and dynamics
Red shift
Star & galaxy formation
Stars & galaxies
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Summary:We investigate scaling relations between the dark matter (DM) halo model parameters for a sample of intermediate-redshift early-type galaxies (ETGs) resorting to a combined analysis of Einstein radii and aperture velocity dispersions. Modelling the dark halo with a Navarro–Frenk–White profile and assuming a Salpeter initial mass function (IMF) to estimate stellar masses, we find that the column density and the Newtonian acceleration within the halo characteristic radius rs and effective radius Reff are not universal quantities, but correlate with the luminosity LV, the stellar mass M★ and the halo mass M200, contrary to recent claims in the literature. We finally discuss a tight correlation among the DM mass MDM(Reff) within the effective radius Reff, the stellar mass M★(Reff) and Reff itself. The slopes of the scaling relations discussed here strongly depend, however, on the DM halo model and the IMF adopted so that these ingredients have to be better constrained in order to draw definitive conclusions on the DM scaling relations for ETGs.
ISSN:0035-8711
1365-2966
DOI:10.1111/j.1365-2966.2010.17398.x