The Mass-Metallicity Relation in Cosmological Hydrodynamic Simulations
| dc.creator | Daveé, Romeel | |
| dc.creator | Finlator, Kristian | |
| dc.creator | Oppenheimer, Benjamin D. | |
| dc.date | 2006-08-25 | |
| dc.date.accessioned | 2026-07-07T07:19:25Z | |
| dc.date.available | 2026-07-07T07:19:25Z | |
| dc.description | We use cosmological hydrodynamic simulations with enriched galactic outflows to compare predictions for the galaxy mass-metallicity (M*-Z) relation versus observations at z~2 from Erb et al. (2006). With no outflows, galaxies are over-enriched, indicating that outflows are required not only to suppress star formation and enrich the IGM but also to lower galaxy metal content. The observed M*-Z slope is matched both in our model without winds as well as our favored outflow model where the outflow velocity scales as the escape velocity, but is too steep in a model with constant outflow speeds. If outflows are too widespread at early times, the IGM out of which smaller galaxies form can become pre-polluted, resulting in a low-mass flattening of the M*-Z relation that is inconsistent with data. Remarkably, the same momentum-driven wind model that provides the best agreement with IGM enrichment data also yields the best agreement with the z~2 M*-Z relation, showing the proper outflow scaling and strength to match the observed slope and amplitude. In this model, the M*-Z relation evolves slowly from z=6-2; an (admittedly uncertain) extrapolation to z=0 broadly matches local M*-Z observations. Overall, the M*-Z relation provides critical constraints on galactic outflow processes during the heydey of star formation in the Universe. | |
| dc.description | 8 pages, to appear in proc. "Chemodynamics 2006: From First Stars to Local Galaxies" | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0608537 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0608537 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/114617 | |
| dc.subject | Astrophysics | |
| dc.title | The Mass-Metallicity Relation in Cosmological Hydrodynamic Simulations | |
| dc.type | text |