APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker: Chris Lidman (Australian Astronomical Observatory)
Title: OzDES - Spectroscopic follow-up of transients and other objects in the DES supernova fields
Date: Tue, Mar 21, 2017, 13:30 - 14:30
Place: Seminar Room A
Abstract: We present results for the first three years of OzDES, a six-year programme to obtain redshifts for objects in the Dark Energy Survey (DES) supernova fields with the 2dF fibre positioner and AAOmega spectrograph on the Anglo-Australian Telescope. OzDES is a multi-object spectroscopic survey targetting multiple types of targets at multiple epochs over a multi-year baseline, and is one of the first multi-object spectroscopic surveys to dynamically include transients into the target list soon after their discovery. At the end of three years, OzDES has spectroscopically confirmed around 100 supernovae, and has obtained host galaxy redshifts for 20 times that number. When combined with DES light curves, OzDES will provide the most detailed measurement of the expansion history of the universe over the last 8 billion years, which will be used with other DES probes to provide the tightest constraints yet on the nature of dark energy.