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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 308730.0, MPI für Astronomie / Publikationen_mpia
A weak lensing estimate from GEMS of the virial to stellar mass ratio in massive galaxies to z ~ 0.8
Authors:Heymans, C.; Bell, E. F.; Rix, H.-W.; Barden, M.; Borch, A.; Caldwell, J. A. R.; McIntosh, D. H.; Meisenheimer, K.; Peng, C. Y.; Wolf, C.; Beckwith, S. V. W.; Häußler, B.; Jahnke, K.; Jogee, S.; Sánchez, S. F.; Somerville, R.; Wisotzki, L.
Date of Publication (YYYY-MM-DD):2006
Journal Abbrev.:Monthly Notices of the Royal Astronomical Society
Start Page:L60
End Page:L64
Audience:Not Specified
Abstract / Description:We present constraints on the evolution of the virial to stellar mass ratio of galaxies with high stellar masses in the redshift range 0.2 < z < 0.8, by comparing weak lensing measurements of virial mass Mvir with estimates of stellar mass Mstar. For a complete sample of galaxies with log(Mstar/Msolar) > 10.5, where the majority show an early-type morphology, we find that the virial mass to stellar mass ratio is given by Mvir/Mstar = 53+13-16. Assuming a baryon fraction from the concordance cosmology, this corresponds to a stellar fraction of baryons in massive galaxies of Omega*b/Omegab = 0.10 +/- 0.03. Analysing the galaxy sample in different redshift slices, we find little or no evolution in the virial to stellar mass ratio, and place an upper limit of ~2.5 on the growth of massive galaxies through the conversion of gas into stars from z = 0.8 to the present day.
Free Keywords:gravitational lensing: galaxies: evolution: galaxies: general: galaxies: haloes: cosmology: observations
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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