A Quantitative Survey for Barred Galaxies

Details A Quantitative Survey for Barred Galaxies A Quantitative Survey for Barred Galaxies

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop..417w&link_type=abstract

NOAO Proposal ID #2000A-0417

Computer Science

Scientific paper

We propose to gather multi-color surface photometry for a complete, magnitude-limited sample of nearby galaxies in a strip of the southern sky, and to make a quantitative estimate of the bar strength in each galaxy. The scientific objectives are two-fold: (1) to obtain a local universe sample of galaxies to compare with those in the HDFs, and (2) to determine whether the frequency of bars varies with absolute luminosity. The HDF measurements find almost no barred galaxies at redshifts above 0.5, suggesting that galaxies evolve slowly and bars form late. Remarkably, there is no comparable survey of nearby galaxies for comparison. It has been predicted for decades that barred galaxies will have less dark matter. Since it is now recognized that low luminosity galaxies have a larger proportion of dark matter, if the prediction is correct we will see fewer bars among the low luminosity galaxies. The observations proposed here will thus investigate both galaxy formation and evolution, and the dark matter content of galaxies.

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