Department of Physics & Astronomy
University of New Mexico

Physics and Astronomy Colloquium

Mapping the Cosmos with DESI: Targeting and First Spectra

Presented by Adam Myers, Associate Professor, University of Wyoming

The Dark Energy Spectroscopic Instrument (DESI) is a fiber-fed robotic multi-object spectrograph on the Mayall 4-meter telescope at Kitt Peak National Observatory. DESI can obtain spectra of ~5000 objects over a ~3 degree field in a single exposure, which will enable a five-year spectroscopic survey of over a third of the sky. DESI dark- and gray-time observations will obtain redshifts for ~30 million galaxies and quasars, allowing new constraints on the expansion history of the Universe over a large dynamic range of cosmic time. During bright-time, DESI will observe an additional ~20M nearby galaxies and stars. The main DESI survey is about to commence, and I will outline the properties of the galaxies, quasars and stars that DESI will target, and display some of the first science spectra from DESI's Survey Validation phase. I will also discuss the results expected from DESI, with a focus on how the Baryon Acoustic Oscillation (BAO) method can be used to constrain the evolution of the distance-redshift relation.

3:30 pm, Friday, April 10, 2020
1100, PAIS

Refreshments will be available before the colloquium, at 3:15 pm.

Disability NoticeIndividuals with disabilities who need an auxiliary aid or service to attend or participate in P&A events should contact Sandra Ortiz (phone: 505-277-5900, email: sportiz@unm.edu) well in advance to ensure your needs are accomodated. Event handouts can be provided in alternative accessible formats upon request. Please contact Mrs. Ortiz if you need written information in an alternative format.

A schedule of talks within the Department of Physics and Astronomy is available on the P&A web site at http://physics.unm.edu/pandaweb/events/index.php