Evolution of Scaling Relations of Field Spiral Galaxies at Intermediate Redshift

Mathematics – Logic

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Hst Proposal Id #9908 Cosmology

Scientific paper

We seek imaging of the William Herschel Deep Field {WHDF} with the ACS to primarily determine morphological and structural parameters of a sample of 94 late-type galaxies brighter than R=23 with redshifts up to z=1. We already obtained spectra of the galaxies at ESO's VLT from which spatially resolved rotation curves are derived. Only the combined VLT and ACS data allows us the construction of the Tully-Fisher Relation {TFR} at intermediate redshift. Together with 77 galaxies from the FORS Deep Field {FDF}, for which we already have ACS determined structural parameters, we will have the hitherto largest kinematic sample to investigate significantly the evolution of the TFR and the Fundamental Plane of spiral galaxies. The additional WHDF galaxies populate mainly both ends of the TFR {i.e. are slow rotators or bright early-type giants} being indispensible for the verification of an evolving slope as suggested by the FDF sample. Such a difference in the luminosity and mass evolution between dwarf and giant galaxies is a strong constraint to current theories of galaxy formation and evolution. The ACS imaging of the WHDF will boost its scientific impact also with other investigations like the study of the Fundamental Plane of intermediate redshift field elliptical galaxies, the study of the size and type evolution of an even larger sample of galaxies and the study of galaxy-galaxy lensing.

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