On the Relative Mass Column Densities of Giant Star-forming Complexes in Clumpy GOODS Galaxies

Details On the Relative Mass Column Densities of Giant Star-forming Complexes in Clumpy GOODS Galaxies On the Relative Mass Column Densities of Giant Star-forming Complexes in Clumpy GOODS Galaxies

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21441601e&link_type=abstract

American Astronomical Society, AAS Meeting #214, #416.01; Bulletin of the American Astronomical Society, Vol. 41, p.682

Astronomy and Astrophysics

Astronomy

Scientific paper

Some galaxies in the HST ACS images of GOODS fields show an extremely clumpy structure, like the clump clusters and chain galaxies we have studied in the UDF. The GOODS galaxies are at lower redshift than the UDF galaxies, and are therefore less subject to morphology corrections due to bandshifting. These lower redshift cases may also show evolutionary trends toward modern spiral galaxies. Here we investigate the ratio of clump mass column density to background disk column density in all of the clump clusters in GOODS. Population synthesis models are used to convert colors and surface brightnesses into age and mass column densities. We compare these ratios to analogous measurements in GOODS spirals. There is a clear trend toward less prominent clumps in spirals than in clump clusters. The large column density ratios in many clump clusters are consistent with our simulations (e.g., Bournaud et al. 2007), which suggest that clumps interact and migrate toward the center to make a bulge.

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