TY - JOUR
T1 - Mapping the distribution of luminous and dark matter in strong lensing galaxies
AU - Ferreras, Ignacio
AU - Saha, Prasenjit
AU - Williams, Liliya L.R.
AU - Burles, Scott
PY - 2007/6
Y1 - 2007/6
N2 - 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.
AB - 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.
KW - CD
KW - Cosmology: dark matter
KW - Galaxies: elliptical and lenticular
KW - Galaxies: halos
KW - Galaxies: stellar content
KW - Gravitational lensing
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U2 - 10.1017/S1743921307014007
DO - 10.1017/S1743921307014007
M3 - Article
AN - SCOPUS:39449090144
SN - 1743-9213
VL - 3
SP - 206
EP - 215
JO - Proceedings of the International Astronomical Union
JF - Proceedings of the International Astronomical Union
IS - S244
ER -