Astronomers plot distances and redshifts of type Ia supernova (as shown in the figure below) to measure the expansion history of the Universe. It was through this method that astronomers discovered that the expansion of the universe is accelerating. Since that discovery 20 years ago, astronomers have made great strides in measuring distances more accurately. The accuracy at which redshifts are measured has largely been ignored. It this project, we will examine how accurately one can measure redshifts in AAT data that has been taken as part of the Dark Energy Survey. We will also examine the implications this has on constraints on the dark energy equation of state parameter.
For further details on this project, please contact the supervisors.