Chris Springob (AAO)
"The 6dFGS Fundamental Plane: Galaxy Evolution, Cosmology, and Cosmography Results"
Abstract. The 6dF Galaxy Survey (6dFGS) is an all southern sky galaxy survey, including 125,000 redshifts and a Fundamental Plane (FP) subsample of 10,000 peculiar velocities, making it the largest peculiar velocity sample to date. We fit the FP for this subsample using a maximum likelihood fit to a tri-variate Gaussian. We then use the distribution of galaxies in FP space to test lambda-CDM cosmology, and to learn about the properties of the galaxies themselves.
In this talk, I discuss the variation of stellar population parameters in FP space, and why the trends suggest that stellar population parameters are independent of merger history. I also discuss the derivation of 6dFGS peculiar velocities, and the early cosmological results derived from analyzing the peculiar velocities. We measure the values of the redshift space distortion parameter (beta) and the bulk flow of galaxies within 161 Mpc/h. I discuss the magnitude and direction of the bulk flow, and what a large bulk flow means for lambda-CDM.
Held in the AAO Conference Room at 11:00 AM on Thursday, 02 August 2012back