Speaker
brenna flaugher
(Fermilab)
Description
DESI is a Stage IV ground-based dark energy experiment that will study baryon acoustic oscillations (BAO) and the growth of structure with a wide-area galaxy and quasar spectroscopic redshift survey. The DESI instrument consists of a new wide-field (3.2 deg. field of view) corrector plus a multi-object spectrometer with 5000 robotically positioned optical fibers. It will be installed at prime focus on the Mayall 4m telescope at Kitt Peak, Arizona. The fibers feed 10 three-arm spectrographs producing spectra that cover a wavelength range from 360-980 nm and have resolution up to 5000. The DESI instrument is designed for a 5 year, 14,000 sq. deg. survey of targets that trace the evolution of dark energy. In particular, we will measure the redshifts galaxies to z = 1.6 and the Lyman Alpha forest to z>2. DESI is the successor to the BOSS spectroscopic redshift survey and complements imaging surveys such as the Dark Energy Survey (DES), which recently completed year 3 out of the planned 5 years of operations, and the Large Synoptic Survey Telescope (LSST), which will start operations early in the next decade.
Author
brenna flaugher
(Fermilab)
