Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21522905e&link_type=abstract
American Astronomical Society, AAS Meeting #215, #229.05; Bulletin of the American Astronomical Society, Vol. 42, p.577
Astronomy and Astrophysics
Astronomy
Scientific paper
The Hubble Space Telescope has opened up a view of star formation in young galaxies that has never been possible before. The dominant characteristic is the presence of enormous young clusters and star complexes in the disk systems. These complexes are 100 times more massive than star forming regions in galaxies today, and yet they appear to form by standard processes, which begin with a localized collapse of disk gas. Highly turbulent conditions are required. Numerical simulations suggest that clump formation is followed by clump migration to the center of the galaxy, where the largest clumps can merge into a bulge. Clumpy disk star formation seems to precede the formation of standard spirals and ellipticals, going back to at least a redshift of 5. Similar forms are present as recently as at redshifts of a few tenths, suggesting that the clumpy structure is not from bandshifting artifacts. Trends are found in the bulge and clump masses and ages, and in the clump/interclump contrasts and mass surface densities of the interclump regions. These trends correspond to changes in the morphology of clumpy galaxies suggesting an evolution toward modern types.
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