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Galactic Plane HI Surveys, Real and Imagined

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As the number of interstellar tracers continues to grow, the 21cm spectral line of neutral hydrogen (HI) remains one of the primary wide-scale delineators of galactic structure. I will briefly review the rebirth of galactic plane HI surveys that began in the mid-1990s, before an in-depth overview of more recent efforts to image the galactic HI distribution with the Arecibo L-band Feed Array, including the recently completed I-GALFA survey. Next I will describe a project undertaken at the University of Exeter which involves creating a “synthetic” galactic plane survey using computational simulations of a Milky-Way-type galaxy. I will close with an overview of the planned galactic HI (and OH) projects that will comprise GASKAP , a Survey Science Project to be carried out with the Australia Square Kilometre Array Pathfinder.

This talk is part of the Cavendish Astrophysics Seminars series.

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