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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 308693.0, MPI für Astronomie / Publikationen_mpia
Weak lensing measurements of dark matter halos of galaxies from COMBO-17
Authors:Kleinheinrich, M.; Schneider, P.; Rix, H. W.; Erben, T.; Wolf, C.; Schirmer, M.; Meisenheimer, K.; Borch, A.; Dye, S.; Kovacs, Z.; Wisotzki, L.
Date of Publication (YYYY-MM-DD):2006
Journal Abbrev.:Astronomy and Astrophysics
Start Page:441
End Page:451
Audience:Not Specified
Abstract / Description:We present mass estimates for dark matter halos around galaxies from the COMBO-17 survey using weak gravitational lensing. COMBO-17, with photometry in 17 optical filters, provides precise photometric redshifts and spectral classification for objects with R<24. This permits to select and sort lens and source galaxies by their redshifts and lens luminosity or color, which bypasses many uncertainties in other weak lensing analyses arising from broadly estimated source and lens redshifts. We study the shear created by dark matter halos around 12 000 galaxy lenses at redshifts z_d=0.2-0.7 by fitting the mass normalization of either singular isothermal spheres (SIS) or Navarro-Frenk-White (NFW) profiles to background source orientations around the whole lens sample. We also consider halos around blue and red subsamples separately and constrain the scaling of halo mass with light. For the NFW model, we find virial masses M_vir^*=3.9× 1011h-1 M⊙ for blue and M_vir^*=7.1× 1011h-1 M⊙ for red galaxies of L_star=1010h-2 L⊙, respectively. The 1-sigma uncertainty on log M_vir* for the whole lens sample is about 0.2. We compare our results to those obtained from the Red-Sequence Cluster Survey (RCS) and the Sloan Digital Sky Survey (SDSS). Taking differences in the actual modelling into account, we find very good agreement with these surveys.
Free Keywords:gravitational lensing; galaxies:; fundamental parameters; galaxies: statistics; cosmology: dark; matter
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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