Other
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9552s&link_type=abstract
HST Proposal ID #9552
Other
Hst Proposal Id #9552 Cosmology
Scientific paper
Recent studies of galaxy morphology with the Hubble Deep Fields have indicated a dramatic paucity of bars beyond a redshift > 0.5. This result is unexpected because the classical bar formation mechanism would predict that bars ought to be more common at higher redshifts because of dynamically colder galaxy disks and increased interactions. If the scarcity of bars is true, then serious constraints may be placed on the evolutionary stage of galactic disks. On the other hand, it is possible that the observations are misleading due to band-shifting and dust obscuration effects. While these criticisms have been suggested qualitatively, a quantitative analysis of the evolution of the bar fraction with redshift is missing. We propose to do such an analysis using the best dataset available for this type of a study, the NICMOS map of the Hubble Deep Field. For a control sample we will use a sample of spirals representative of the nearby Universe and simulate their appearance at different redshifts. From these simulated data, we will measure the bar fraction for comparison to our analysis of the NICMOS data.
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