Two-dimensional kinematics of SLACS lenses - II. Combined lensing and dynamics analysis of early-type galaxies at z=0.08-0.33

Barnabe, M., Czoske, O., Koopmans, L. V. E., Treu, T., Bolton, A. S. & Gavazzi, R., 11-Oct-2009, In : Monthly Notices of the Royal Astronomical Society. 399, 1, p. 21-36 16 p.

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We present the first detailed analysis of the mass and dynamical structure of a sample of six early-type lens galaxies, selected from the Sloan Lens ACS Survey, in the redshift range 0.08 less than or similar to z less than or similar to 0.33. Both Hubble Space Telescope/Advanced Camera for Surveys (ACS) high-resolution imaging and Very Large Telescope Visible Multi-Object Spectrograph (VIMOS) integral-field spectroscopy are available for these systems. The galaxies are modelled - under the assumptions of axial symmetry and two-integral stellar distribution function - by making use of the CAULDRON code, which self-consistently combines gravitational lensing and stellar dynamics and is fully embedded within the framework of Bayesian statistics. The principal results of this study are: (i) all galaxies in the sample are well described by a simple axisymmetric power-law profile for the total density, with a logarithmic slope gamma' very close to isothermal ( = 1.98 +/- 0.05 and an intrinsic spread close to 5 per cent) showing no evidence of evolution over the probed range of redshift; (ii) the axial ratio of the total density distribution is rounder than 0.65 and in all cases, except for a fast rotator, does not deviate significantly from the flattening of the intrinsic stellar distribution; (iii) the dark matter fraction within the effective radius has a lower limit of about 15-30 per cent; (iv) the sample galaxies are only mildly anisotropic, with vertical bar delta vertical bar

Original languageEnglish
Pages (from-to)21-36
Number of pages16
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
Publication statusPublished - 11-Oct-2009


  • gravitational lensing, galaxies: elliptical and lenticular, cD, galaxies: kinematics and dynamics, galaxies: structure, DARK-MATTER, ELLIPTIC GALAXIES, ACS SURVEY, SAURON PROJECT, LENTICULAR GALAXIES, INTERNAL STRUCTURE, FUNDAMENTAL PLANE, VELOCITY PROFILES, SCALING RELATIONS, ORBITAL STRUCTURE

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