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

Ferreras, Ignacio ; Saha, Prasenjit ; Williams, Liliya L. R. ; Burles, Scott

In: Proceedings of the International Astronomical Union, 2007, vol. 3, no. S244, p. 206-215

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    Titre
    • Mapping the Distribution of Luminous and Dark Matter in Strong Lensing Galaxies
    Auteur
    • Ferreras, Ignacio. Dept. of Physics, King's College London, Strand, London WC2R 2LS, UK
    • Saha, Prasenjit. Institute for Theoretical Physics, University of Zürich, Winterthurerstr. 190, CH8057 Zürich, Switzerland
    • Williams, Liliya L. R.. Dept. of Physics, University of Minnesota, 116 Church St. SE, Minneapolis, MN55455, USA
    • Burles, Scott. Dept. of Physics, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA02139, USA
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Proceedings of the International Astronomical Union, 2007, vol. 3, no. S244, p. 206-215. Cambridge University Press
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:302082
    Summary
    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