Issue |
A&A
Volume 455, Number 1, August III 2006
|
|
---|---|---|
Page(s) | 107 - 118 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20054217 | |
Published online | 31 July 2006 |
3D spectroscopy with VLT/GIRAFFE
I. The true Tully Fisher relationship at z
0.6
1
Laboratoire Galaxies Etoiles Physique et Instrumentation, Observatoire de Paris-Meudon, 5 place Jules Janssen, 92195 Meudon Cedex, France e-mail: hector.flores@obspm.fr
2
Observatoire Astronomique Marseille-Provence & Laboratoire d'Astrophysique de Marseille, 2 place Le Verrier, 13248 Marseille Cedex 04, France
Received:
16
September
2005
Accepted:
22
February
2006
A precise derivation of the evolution of the Tully Fisher is crucial
to understand the interplay between dark matter and baryonic
matter in cosmological models,
using 15 deployable integral field
units of FLAMES/GIRAFFE at VLT, we have recovered the velocity fields
of 35 galaxies at intermediate redshift (). This
facility is able to recover the velocity fields of almost all the
emission line galaxies with
and
Å.
In our sample, we find only 35% rotating
disks. These rotating disks produce a Tully-Fisher relationship
(stellar mass or MK versus
) which has apparently not
evolved in slope, zero point and scatter since
. The only
evolution found is a brightening of the B band luminosity of a third
of the disks, possibly due to an enhancement of the star
formation.
The very large scatters found in previously reported
Tully-Fisher relationships at moderate redshifts are caused by the
numerous (65%) galaxies with perturbed or complex kinematics.
Those galaxies include minor or major mergers, merger remnants and/or
inflow/outflows and their kinematics can be easily misidentified by
slit spectroscopy. Their presence suggests a strong evolution in the
dynamical properties of galaxies during the last 7 Gyr.
Key words: galaxies: kinematics and dynamics / galaxies: evolution / galaxies: formation
© ESO, 2006
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