Mapping the distribution of luminous and dark matter in strong lensing galaxies
arXiv:0708.2151 · doi:10.1017/S1743921307014007
Abstract
We present the distribution of luminous and dark matter in a set of strong lensing (early-type) galaxies. By combining two independent techniques - stellar population synthesis and gravitational lensing - we can compare the baryonic and dark matter content in these galaxies within the regions that can be probed using the images of the lensed background source. Two samples were studied, extracted from the CASTLES and SLACS surveys. The former probes a wider range of redshifts and allows us to explore the mass distribution out to ~5Re. The high resolution optical images of the latter (using HST/ACS) are used to show a pixellated map of the ratio between total and baryonic matter. We find dark matter to be absent in the cores of these galaxies, with an increasing contribution at projected radii R>Re. The slopes are roughly compatible with an isothermal slope (better interpreted as an adiabatically contracted NFW profile), but a large scatter in the slope exists among galaxies. There is a trend suggesting most massive galaxies have a higher content of dark matter in the regions probed by this analysis.
arXiv comment10 pages, 6 figures. To appear in "Dark Galaxies and Lost Baryons", IAU244 conference proceedings
References in corpus (29)
- Stellar population synthesis at the resolution of 2003
- Galactic Stellar and Substellar Initial Mass Function
- Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
- The SAURON project - IV. The mass-to-light ratio, the virial mass estimator and the fundamental plane of elliptical and lenticular galaxies
- Rotation Curves of Spiral Galaxies
- The Stellar Population Histories of Early-Type Galaxies. II. Controlling Parameters of the Stellar Populations
- The Sloan Lens ACS Survey. III - The Structure and Formation of Early-type Galaxies and their Evolution since z~1
- The Sloan Lens ACS Survey. I. A Large Spectroscopically Selected Sample of Massive Early-Type Lens Galaxies
- Dark matter in elliptical galaxies: II. Estimating the mass within the virial radius
- Lost & Found Dark Matter in Elliptical Galaxies
- The Evolution of a Mass-Selected Sample of Early-Type Field Galaxies
- Galaxy mapping with the SAURON integral-field spectrograph: The star formation history of NGC 4365
- The PN.S Elliptical Galaxy Survey: Data Reduction, Planetary Nebula Catalog, and Basic Dynamics for NGC 3379
- A portable modeler of lensed quasars
- The Planetary Nebulae Spectrograph: the green light for Galaxy Kinematics
- Non-parametric reconstruction of the galaxy-lens in PG1115+080
- Pixelated Lenses and H_0 from Time-delay QSOs
- Stellar and total mass in early-type lensing galaxies
- Non-parametric mass reconstruction of A1689 from strong lensing data with SLAP
- A multipole-Taylor expansion for the potential of gravitational lens MG J0414+0534
- Qualitative Theory for Lensed QSOs
- Values of H_0 from Models of the Gravitational Lens 0957+561
- The isolated elliptical NGC 4555 observed with Chandra
- On breaking the age-metallicity degeneracy in early-type galaxies: Outflows versus Star Formation Efficiency
- Two strong-lensing clusters confront universal dark-matter profiles
- The Nature of Dark Matter in Elliptical Galaxies: Chandra Observations of NGC 4636
- The Quintuple Quasar: Mass Models and Interpretation
- Massive elliptical galaxies : From cores to haloes
- The anatomy of a quadruply imaged gravitational lens system