Feedback in simulations of disc-galaxy major mergers
| dc.creator | Cox, T. J. | |
| dc.creator | Jonsson, Patrik | |
| dc.creator | Primack, Joel R. | |
| dc.creator | Somerville, Rachel S. | |
| dc.date | 2005-03-09 | |
| dc.date | 2007-09-25 | |
| dc.date.accessioned | 2026-07-07T08:31:52Z | |
| dc.date.available | 2026-07-07T08:31:52Z | |
| dc.description | Using hydrodynamic simulations of disc-galaxy major mergers, we investigate the star formation history and remnant properties when various parametrizations of a simple stellar feedback model are implemented. The simulations include radiative cooling, a density-dependent star formation recipe and a model for feedback from massive stars. The feedback model stores supernova feedback energy within individual gas particles and dissipates this energy on a time-scale specified by two free parameters; tau_fb, which sets the dissipative time-scale, and n, which sets the effective equation of state in star-forming regions. Using a self-consistent disc galaxy, modelled after a local Sbc spiral, in both isolated and major-merger simulations, we investigate parametrizations of the feedback model that are selected with respect to the quiescent disc stability. These models produce a range of star formation histories that are consistent with the star formation relation found by Kennicutt. All major mergers produce a population of new stars that is highly centrally concentrated, demonstrating a distinct break in the r1/4 surface density profile, consistent with previous findings. The half-mass radius and one-dimensional velocity dispersion are affected by the feedback model used. Finally, we compare our results to those of previous simulations of star formation in disc-galaxy major mergers, addressing the effects of star formation normalization, the version of smoothed particle hydrodynamics (SPH) employed and assumptions about the interstellar medium. | |
| dc.description | update to match published version | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0503201 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0503201 | |
| dc.identifier | 2006 MNRAS, 373, 1013 | |
| dc.identifier | doi:10.1111/j.1365-2966.2006.11107.x | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/138629 | |
| dc.subject | Astrophysics | |
| dc.title | Feedback in simulations of disc-galaxy major mergers | |
| dc.type | text |