Mapping the distribution of luminous and dark matter in strong lensing galaxies

Details Mapping the distribution of luminous and dark matter in strong lensing galaxies Mapping the distribution of luminous and dark matter in strong lensing galaxies

2007-08-16

arxiv.org/abs/0708.2151v1

IAU Symp.244:206-215,2008

Astronomy and Astrophysics

Astrophysics

10 pages, 6 figures. To appear in "Dark Galaxies and Lost Baryons", IAU244 conference proceedings

Scientific paper

10.1017/S1743921307014007

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.

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