The Evolving Structure of Galactic Disks
| dc.creator | Martel, Hugo | |
| dc.creator | Brook, Chris | |
| dc.creator | McGee, Sean | |
| dc.creator | Gibson, Brad | |
| dc.creator | Kawata, Daisuke | |
| dc.date | 2005-09-14 | |
| dc.date.accessioned | 2026-07-25T12:31:21Z | |
| dc.description | Observations suggest that the structural parameters of disk galaxies have not changed greatly since redshift 1. We examine whether these observations are consistent with a cosmology in which structures form hierarchically. We use SPH/N-body galaxy-scale simulations to simulate the formation and evolution of Milky-Way-like disk galaxies by fragmentation, followed by hierarchical merging. The simulated galaxies have a thick disk, that forms in a period of chaotic merging at high redshift, during which a large amount of alpha-elements are produced, and a thin disk, that forms later and has a higher metallicity. Our simulated disks settle down quickly and do not evolve much since redshift z~1, mostly because no major mergers take place between z=1 and z=0. During this period, the disk radius increases (inside-out growth) while its thickness remains constant. These results are consistent with observations of disk galaxies at low and high redshift. | |
| dc.description | Will appear in Proceedings of the 9th Asian Pacific Regional IAU Meeting | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0509371 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0509371 | |
| dc.identifier.uri | https://dspace.dare.co.zw/handle/123456789/10426 | |
| dc.subject | Astrophysics | |
| dc.title | The Evolving Structure of Galactic Disks | |
| dc.type | text |