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A weak lensing estimate from GEMS of the virial to stellar mass ratio in massive galaxies to z ∼ 0.8

被引：57
作者：
Heymans, Catherine
Bell, Eric F.
Rix, Hans-Walter
Barden, Marco
Borch, Andrea
Caldwell, John A. R.
McIntosh, Daniel H.
Meisenheimer, Klaus
Peng, Chien Y.
Wolf, Christian
Beckwith, Steven V. W.
Haeussler, Boris
Jahnke, Knud
Jogee, Shardha
Sanchez, Sebastian F.
Somerville, Rachel
Wisotzki, Lutz
机构：
[1] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada
[2] Max Planck Inst Astron, Heidelberg, Germany
[3] Astron Rech Inst, D-69120 Heidelberg, Germany
[4] Univ Texas, McDonald Observ, Ft Davis, TX 79734 USA
[5] Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA
[6] Space Telescope Sci Inst, Baltimore, MD 21218 USA
[7] Univ Oxford, Dept Astrophys, Oxford OX1 3RH, England
[8] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
[9] Univ Texas, Dept Astron, Austin, TX 78712 USA
[10] Ctr Hispano Aleman Calar Alto, E-04004 Almeria, Spain
[11] Inst Astrophys, D-14482 Potsdam, Germany
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2006年 / 371卷 / 01期
关键词：
gravitational lensing; galaxies : evolution; galaxies : general; galaxies : haloes; cosmology : observations;
D O I：
10.1111/j.1745-3933.2006.00208.x
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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 M-vir with estimates of stellar mass M-star. For a complete sample of galaxies with log (M(sta)r/M circle dot) > 10.5, where the majority show an early- type morphology, we find that the virial mass to stellar mass ratio is given by M-vir/M-star = 53(-16)(+13). Assuming a baryon fraction from the concordance cosmology, this corresponds to a stellar fraction of baryons in massive galaxies of Omega(b)*/Omega(b) = 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 similar to 2.5 on the growth of massive galaxies through the conversion of gas into stars from z = 0.8 to the present day.
引用
收藏
页码：L60 / L64
页数：5
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