Institute of Astronomy

Galactic Winds: Implications for Models of Galaxy Evolution

SpeakerTalk DateTalk Series
Tim Heckman (Johns Hopkins University, CAS)23 April 2015Institute of Astronomy Colloquia


Galactic winds are the most dramatic form of feedback provided by massive stars. In the first part of my talk I will summarize the importance of galactic winds for the evolution of galaxies and the inter-galactic medium. I will briefly describe the physical processes that drive these winds, and give a short guided tour of the multi-phase wind driven from the local starburst galaxy M82. I will then describe how the properties of winds are typically incorporated in cosmological simulations and semi-analytic models. In the second part of my talk I report on recent work that has determined the dependence of the basic wind properties (outflow velocities, mass and momentum outflow rates) on the properties of the galaxy/starburst. These results are strongly at odds with some of the most popular wind prescriptions in simulations and models. In the third part of the talk I will describe observations of the impact of galactic winds on the circum-galactic medium. Finally, I will report on new observations that reveal how stellar feedback, including galactic winds, enabled early star-forming galaxies to re-ionize the universe.


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