Bibcode
Jogee, S.; Conselice, C.; Ravindranath, S.; Shlosman, I.; Knapen, J. H.; Mobasher, B.; Koekemoer, A. M.; Lucas, R. A.; Laine, S.; Hornschemeier, A.; GOODS Team
Bibliographical reference
American Astronomical Society, 201st AAS Meeting, #06.15; Bulletin of the American Astronomical Society, Vol. 34, p.1100
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12
2002
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Description
Non-axisymmetric features (such as bars and spirals) as well as general
triaxialities (such as those of the bulge and halo) drive the dynamical
and secular evolution of disk galaxies by exerting gravitational torques
which redistribute mass and angular momentum. While most (> 70 %)
spirals are barred in the local Universe, early studies of the HDF
suggest a remarkably low bar fraction (< 10 %) at intermediate
redshifts. If confirmed, this result would imply that the dynamics and
evolution of disks at intermediate redshifts are fundamentally different
from present-day spirals. With the overall goal of constraining the
dynamics, evolution, and mass assembly of disk galaxies, we have started
a study based on the Great Observatories Origins Deep Survey (GOODS) ACS
BViz images and numerical modeling, aimed at estimating the fraction and
properties of bars/spirals/asymmetries, the central mass concentration,
and the level of activity in disk galaxies out to z 1. The GOODS ACS
data provide improved resolution, a larger field of view (10'x16' per
field), a factor of at least 10 improvement in number statistics, and
better wavelength coverage compared to the WFPC2 HDF data used in
earlier studies. We illustrate techniques for bar and asymmetry
identifications from studies of local galaxies , as well as intermediate
redshift spirals. We show preliminary analysis of the disk/bar
properties, central mass concentrations and level of star formation. We
present a new method and first results to analyze stability of bars
embedded in massive halos of various central concentrations and
asymmetries.