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IR STIG Seminar

Infrared Science and Technology Interest Group

IR STIG about IR STIG Seminar

Location

Virtual

Dates

13 October 2026
12:00pm PT / 3:00pm ET 

Community

IR STIG

Type

Seminar

The Dark Energy Spectroscopic Instrument

Speaker

Kelly Douglass, University of Rochester

Abstract

The Dark Energy Spectroscopic Instrument (DESI) is a highly efficient multi-object fiber spectrograph designed to measure the expansion rate of the universe with a galaxy redshift survey containing tens of millions of galaxies and quasars.  Its unprecedented capabilities allow us to create the most detailed 3D maps of the universe to date.  In this talk, I will describe the selection of DESI’s spectroscopic targets, how DESI measures baryonic acoustic oscillations (BAO) to measure the expansion rate of the Universe out to a redshift of 3.5, and what these results reveal about dark energy.

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Angled from the upper left corner to the lower right corner is a cone-shaped orange-red cloud known as Herbig-Haro 49/50. This feature takes up about three-fourths of the length of this angle. The upper left end of this feature has a translucent, rounded end. The conical feature widens slightly from the rounded end at the upper right down to the lower right. Along the cone there are additional rounded edges, like edges of a wave, and intricate foamy-like details, as well as a clearer view of the black background of space. In the upper left, overlapping with the rounded end of Herbig-Haro 49/50, is a background spiral galaxy with a concentrated blue center that fades outward to blend with red spiral arms. The background of space is speckled with some white stars and smaller, more numerous, fainter white galaxies throughout.