IMAGES: a unique view of the galaxy mass assembly since z=1

Details IMAGES: a unique view of the galaxy mass assembly since z=1 IMAGES: a unique view of the galaxy mass assembly since z=1

2007-12-07

arxiv.org/abs/0712.1138v1

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures, proceeding of the meeting "Science with the VLT in the ELT era", held in garching, 8-12 Oct 2007

Scientific paper

The Large Program IMAGES is near 2/3 of its completion. It provides us with kinematics (GIRAFFE deployable IFUs), gas chemistry (FORS2), detailed morphologies (HST/ACS) and IR photometry (Spitzer) for a set of 70 galaxies representative of intermediate mass galaxies (MJ<=-20.3 or 1.5e10 Mo) at z=0.4-0.75. We discover that, 6 Gyr ago, a significant fraction of galaxies (>40%) had anomalous kinematics, i.e. kinematics significantly discrepant from those of rotational or dispersion supported galaxies. The anomalous kinematics cause the observed large dispersion of the Tully-Fisher relation at large distances. IMAGES will soon allow us to study distant galaxies at a level of detail almost comparable to that of nearby galaxies.

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