Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-09-14
Astronomy and Astrophysics
Astrophysics
6 pages, 5 figures. To be published in the proceedings of IAU Symposium No. 225: The Impact of Gravitational Lensing on Cosmol
Scientific paper
10.1017/S174392130500205X
We study the dark matter halos of galaxies with galaxy-galaxy lensing using the COMBO-17 survey. This survey offers an unprecedented data set for studying lens galaxies at z=0.2-0.7 including redshift information and spectral classification from 17 optical filters for objects brighter than R=24. So far, redshifts and classification for the lens galaxies have mainly been available for local surveys like the Sloan Digital Sky Survey (SDSS). Further, redshifts for the source galaxies have typically not been available at all but had to be estimated from redshift probability distribution which -- for faint surveys -- even had to be extrapolated. To study the dark matter halos we parametrize the lens galaxies as singular isothermal spheres (SIS) or by Navarro-Frenk-White (NFW) profiles. In both cases we find a dependence of the velocity dispersion or virial radius, respectively, on lens luminosity and colour. For the SIS model, we are able to reproduce the Tully-Fisher/Faber-Jackson relation on a scale of 150h^-1kpc. For the NFW profile we also calculate virial masses, mass-to-light ratios and rotation velocities. Finally, we investigate differences between the three survey fields used here.
Erben Thomas
Kleinheinrich Martina
Meisenheimer Klaus
Rix Hans-Walter
Schirmer Mischa
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