Formation of Galactic Bulges
Astrophysics
2009-10-31 v2
Abstract
We use cosmological hydrodynamic simulations to investigate formation of galactic bulges within the framework of hierarchical clustering in a representative CDM cosmological model. We show that largest objects forming at cosmological redshifts z~4 resemble observed bulges of spiral galaxies or moderate size ellipticals in their general properties like sizes, shapes, and density profiles. This is consistent with observational data indicating the existence of ``old'' bulges and ellipticals at more moderate redshifts. These bulges are gas dominated at redshift z=3, with high rates of star formation and would appear to be good candidates for small blue galaxies seen in the Hubble Deep Field.
Cite
@article{arxiv.astro-ph/9912563,
title = {Formation of Galactic Bulges},
author = {Nickolay Y. Gnedin and Michael L. Norman and Jeremiah P. Ostriker},
journal= {arXiv preprint arXiv:astro-ph/9912563},
year = {2009}
}
Comments
Revised version accepted for publication in ApJ