Institute of Astronomy

Supernova clustering and galactic outflows

SpeakerTalk DateTalk Series
Matthew Smith (CfA Harvard)25 September 2020Institute of Astronomy Galaxies Discussion Group

Abstract

Galactic outflows are commonly observed in a wide variety of systems. They form a fundamental component of contemporary theories of galaxy formation. This is particularly the case for low-mass galaxies, where star formation driven outflows are expected to be ubiquitous. They are frequently invoked to regulate stellar mass growth, reduce the overall baryon fraction, explain the mass-metallicity scaling relation, enrich the CGM/IGM with metals and possibly transform dark matter density
profiles. However, the mechanisms that launch stellar driven galactic outflows are very much an open topic of research. In this talk, I will examine the sensitivity of galactic wind launching to the clustering properties of supernovae in space and time. In particular, I will show how the dispersal of star forming clouds by pre-supernova feedback can modulate the clustering of supernovae, their ability to form super-bubbles and hence generate galactic outflows. I will do this with the aid of a new state-of-the-art suite of high resolution simulations of dwarf galaxies that links feedback to individually resolved massive stars.

Presentation

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