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Mapping the Distribution of Luminous and Dark Matter in Strong Lensing Galaxies

Published online by Cambridge University Press:  01 June 2007

Ignacio Ferreras ,
Prasenjit Saha ,
Liliya L. R. Williams  and
Scott Burles
Ignacio Ferreras*
Affiliation:
Dept. of Physics, King's College London, Strand, London WC2R 2LS, UK
Prasenjit Saha
Affiliation:
Institute for Theoretical Physics, University of Zürich, Winterthurerstr. 190, CH8057 Zürich, Switzerland
Liliya L. R. Williams
Affiliation:
Dept. of Physics, University of Minnesota, 116 Church St. SE, Minneapolis, MN55455, USA
Scott Burles
Affiliation:
Dept. of Physics, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA02139, USA
*
†email: ferreras@star.ucl.ac.uk
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Abstract

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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.

Keywords

gravitational lensinggalaxies: elliptical and lenticularcDgalaxies: halosgalaxies: stellar contentcosmology: dark matter
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S244: Dark Galaxies and Lost Baryons , June 2007 , pp. 206 - 215
Copyright
Copyright © International Astronomical Union 2008

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