Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-06-05
Astrophys.J. 611 (2004) 20-25
Astronomy and Astrophysics
Astrophysics
20 pages, Latex, 9 figures, to appear in the Astrophysical Journal. Version with high quality images available at http://www
Scientific paper
10.1086/422179
We investigate the origin of the clumpy structures observed at high redshift, like the chain galaxies. We use a three dimensional chemodynamical simulation describing the dynamics of stars and a two-phase interstellar medium, as well as feedback processes from the stars. For high efficiency of energy dissipation in the cold cloud medium, the initially gaseous disk fragments and develops several massive clumps of gas and stars. We follow the evolution of the individual clumps and determine their masses, metallicities and velocities. A few dynamical times after fragmentation of the disk, the clumps merge to build a massive bulge. Calculating HST- and UBVRIJHKLM-colors, including absorption by interstellar dust, we determine the morphologies and colors of this model in HST images. Several peculiar morphological structures seen in the HDF can be well-explained by a fragmented galactic disk model, including chain galaxies and objects consisting of several nearby knots.
Gerhard Ortwin
Immeli Andreas
Samland Markus
Westera Pieter
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