University of Waterloo
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Waterloo, Ontario, Canada N2L 3G1
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Different modes of stellar feedback play different roles within galaxies. We study the role of supernovae, an historically popular choice, on the evolution of galaxies and their stellar content. We argue that prior work has modeled supernovae poorly by ignoring stellar clustering and also the key physics of conduction that governs hot gas evolution. Clustered supernovae create superbubbles, kpc-scale feedback events that can drive strong galactic winds. We show that superbubbles can be modeled via first principles simulations without resorting to common numerical tricks that may lead to incorrect results. In particular, we find that entropy plays an important role in generating winds. Galaxies with superbubble feedback strongly regulate their star formation and global baryon budget. These simulated galaxies match disk galaxy observations very well. However, there are limits -- supernovae cannot explain the regulation of star formation in massive galaxies.
James was born in Australia and has been in North America (primarily Canada) since 1992, when he started Graduate work in Astronomy at the University of Toronto. Working with his supervisor Dick Bond at CITA he applied gasdynamical simulations to the Lyman alpha forest problem. James was a postdoc at the University of Washington working with Craig Hogan and the "N-body Shop" group where he wrote the Gasoline code with Joachim Stadel and Tom Quinn. He then came to McMaster to work with Ralph Pudtriz and Hugh Couchman in Physics and Astronomy. In 2002 James switched from full-time research to start spending time all over campus assisting researchers to develop parallel programs for the new SHARCNET supercomputer clusters. He was still involved in cutting edge astrophysics research and in July 2003 James took up a tenure track position with the Physics and Astronomy Department at McMaster.
The University of Waterloo acknowledges that much of our work takes place on the traditional territory of the Neutral, Anishinaabeg and Haudenosaunee peoples. Our main campus is situated on the Haldimand Tract, the land granted to the Six Nations that includes six miles on each side of the Grand River. Our active work toward reconciliation takes place across our campuses through research, learning, teaching, and community building, and is centralized within our Indigenous Initiatives Office.