| Speaker: | Jeremy Mould (Swinburne University) |
|---|---|
| Title: | Mapping the Dark Matter with recent redshift surveys |
| Date (JST): | Wed, Apr 11, 2012, 13:30 - 15:00 |
| Place: | Lecture Hall |
| Related File: | 666.pdf |
| Abstract: |
Fundamental plane distances from the 6dF Galaxy Redshift Survey are fitted to a model of the density field within 200/h Mpc. Likelihood is maximized for a single value of the local galaxy density, as expected in linear theory for the relation between overdensity and peculiar velocity. The dipole of the inferred southern hemisphere early type galaxy peculiar velocities is calculated within 150/h Mpc, before and after correction for the individual galaxy velocities predicted by the model. The former agrees with that obtained by other peculiar velocity studies (e.g. SFI++*). The latter is only of order 150 km/sec and consistent with the expectations of the standard cosmological model and recent forecasts of the cosmic mach number, which show linearly declining bulk flow with increasing scale. Prospects for extending this work include the WALLABY 21 cm survey and the TAIPAN optical redshift survey. The prospects for a 1% measurement of the Hubble Constant (and its impact, together with CMB measurements, on neutrino physics) will also be discussed. * SFI++: Masters et al. 2006, ApJ, 653, 861 Springob et al. 2007, ApJS, 172, 599 (Erratum ApJS, 182, 474, 2009) |
