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

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

2006-06-16

arxiv.org/abs/astro-ph/0606418v1

Mon.Not.Roy.Astron.Soc.Lett. 371 (2006) L60-L64

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures, to appear in MNRAS Letters. Version includes referee comments

Scientific paper

10.1111/j.1745-3933.2006.00208.x

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 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^{+13}_{-16}. 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 ~2.5 on the growth of massive galaxies through the conversion of gas into stars from z=0.8 to the present day.

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