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2018 Fall Science Colloquia

On the Morphologies of Cool Circumgalactic Gas Flows: Insights from Absorption- and Emission-Line Tracers

Presented by: Kate Rubin (San Diego State University)
Category: Science Colloquia   Duration: 1 hour   Broadcast date: November 14, 2018
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November 14, 2018 Title: On the Morphologies of Cool Circumgalactic Gas Flows: Insights from Absorption- and Emission-Line Tracers Abstract: Quasar absorption line experiments with HST have revealed the mass of diffuse gas in the halos of ~L* galaxies to be at least comparable to the baryonic mass of the galaxies’ disks. However, these studies provide limited information on the spatial distribution of this circumgalactic material, such that its relationship to the gas accretion and galactic winds that are thought to regulate star formation in the host galaxies remains poorly understood. I will discuss alternative approaches using spatially-resolved spectroscopy from the SDSS-IV/MaNGA survey and the Keck Cosmic Web Imager to demonstrate, e.g., that bipolar outflows occur with higher frequency closer to the nuclei of nearby star-forming galaxies; a surprisingly high incidence (but small cross section) of cool gas accretion onto these same systems; and that the incidence of both outflows and inflows increases with star formation rate. Such three-dimensional study will ultimately reveal the role of this massive, diffuse baryonic reservoir in feeding galaxy growth.