Special Universe Talk: Cosmic flow reconstruction from deepest distance and redshift surveys

by Guilhem Lavaux (Institut d'Astrophysique de Paris)

Tuesday 27 Sept 2016, 11:00 → 12:00 Europe/Berlin

seminar room, basement (Cluster building, Boltzmannstr. 2, Garching)

Guilhem will review the algorithmic state of the VIRBIUS (VelocIty Reconstruction using Bayesian Inference Software, Lavaux 2016) inference machine. Then he will present the first applications of this machine on recent distant surveys such as CosmicFlows-2 (Tully et al. 2013) and 6dFv (Campbell et al. 2014). VIRBIUS is attempting to build a full linear model of the velocity field, including the possibility for the different sub-catalog to have different zero-point calibration, different subpopulation of tracers, possibly with catastrophic errors and unknown distance distributions. Guilhem will show some results obtained by this method using these catalogs, assessing at the same time the error rate in observational data.