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S. Jogee (STScI), GEMS Collaboration, GOODS Team
Non-axisymmetric features such as bars drive the dynamical and secular evolution of disk galaxies by exerting gravitational torques which redistribute mass and angular momentum. Bars may also solve the cusp-core controversy regarding dark matter halos. While most ( > 70 barred in the local Universe, early studies of the Hubble Deep Field (HDF) suggest a remarkably low bar fraction ( < 5 %) at intermediate redshifts (z=0.5-0.8). If confirmed, this result would imply that disks at these epochs are fundamentally different from present-day spirals.Using the two largest HST ACS surveys to date: Galaxy Evolution from Morphology and SEDS (GEMS) and the Great Observatories Origins Deep Survey (GOODS), we revisit the recoverability, fraction, and properties of bars out to redshift ~1 where the Universe was half its present age. We discuss the implications for the formation, structure and activities of disk galaxies over a wide range of cosmic times.We also present first results to analyze the stability of bars embedded in massive halos of various central concentrations and asymmetries.
Support for this work was provided by LTSA grant NAG5-13063.
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The author(s) of this abstract have provided an email address for comments about the abstract: jogee@stsci.edu
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Bulletin of the American Astronomical Society, 36 #2
© 2004. The American Astronomical Soceity.