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Cd Galaxies
Confidence Interval
Distribution Function
Dynamic Model
Early Type
Elliptical and Lenticular
Gravitational Lensing
High Resolution Imager
Hubble Space Telescope
Integral Field Spectroscopy
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Twodimensional kinematics of SLACS lenses  III. Mass structure and dynamics of earlytype lens galaxies beyond z ~= 0.1
Twodimensional kinematics of SLACS lenses  III. Mass structure and dynamics of earlytype lens galaxies beyond z ~= 0.1,10.1111/j.13652966.2011.188
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Twodimensional kinematics of SLACS lenses  III. Mass structure and dynamics of earlytype lens galaxies beyond z ~= 0.1
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Matteo Barnabè
,
Oliver Czoske
,
Léon V. E. Koopmans
,
Tommaso Treu
,
Adam S. Bolton
We combine in a selfconsistent way the constraints from both
gravitational lensing
and stellar kinematics to perform a detailed investigation of the internal mass distribution, amount of dark matter, and dynamical structure of the 16 earlytype lens galaxies from the Sloan Lens ACS Survey (SLACS Survey), at z= 0.080.33, for which both Hubble Space Telescope/Advanced camera for Surveys and NICMOS highresolution imaging and
Very Large Telescope
VIMOS integralfield spectroscopy are available. Based on this data set, we analyse the inner regions of the galaxies, that is, typically within one (threedimensional) effective radius re, under the assumption of axial symmetry and by constructing dynamical models supported by twointegral stellar distribution functions. For all systems, the total mass density distribution is found to be well approximated by a simple
power law
? (with m being the ellipsoidal radius): this profile is on average slightly superisothermal, with a logarithmic slope = 2.074+0.0430.041 (errors indicate the 68 per cent confidence interval) and an intrinsic scatter ?, and is fairly round, with an average
axial ratio
= 0.77 ± 0.04. The lower limit for the
dark matter
fraction (fDM) inside re ranges, in individual systems, from nearly zero to almost a half, with a median value of 12 per cent. By including stellar masses derived from
stellar population
synthesis models with a Salpeter
initial mass function
(IMF), we obtain an average fDM= 31 per cent, and the corresponding stellar profiles are physically acceptable, with the exception of two cases where they only marginally exceed the total mass profile. fDM rises to 61 per cent if, instead, a Chabrier IMF is assumed. For both IMFs, the
dark matter
fraction increases with the total mass of the galaxy (correlation significant at the 3sigma level). Based on the intrinsic
angular momentum
parameter calculated from our models, we find that the galaxies can be divided into two dynamically distinct groups, which are shown to correspond to the usual classes of the (observationally defined) slow and fast rotators. Overall, the SLACS systems are structurally and dynamically very similar to their nearby counterparts, indicating that the inner regions of earlytype galaxies have undergone little, if any, evolution since redshift z≈ 0.35.
Journal:
Monthly Notices of The Royal Astronomical Society  MON NOTIC ROY ASTRON SOC
, vol. 415, pp. 22152232, 2011
DOI:
10.1111/j.13652966.2011.18842.x
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