Constraining galaxy evolution and cosmology from high-redshift galaxy ages

R. Thomas1*, O. Le Fèvre1, M. Scodeggio2, with the VVDS and VUDS collaborations
1Aix Marseille Université, CNRS, LAM (Laboratoire d’Astrophysique de Marseille) UMR 7326, 13388, Marseille, France
2Istituto di Astrofisica Spaziale e Fisica Cosmica, Istituto Nazionale Di Astrofisica via Bassini 15, I-20133, Milano, Italy

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Abstract

We present here a work focused on both cosmology and galaxy evolution. First, we use both photometry and spectroscopy to compute galactic ages and their formation redshift. This allows to determine the epoch of galaxy formation and its duration. Then, we use the time evolution of the 4000 Å break to compute ages of passively evolving galaxies. From these ages we compute the Hubble parameter evolution.

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Keywords : High redshift galaxies, galaxy evolution, cosmology