Probing Large Scale Power in the Universe using the Galaxy Peculiar Velocity Covariance Matrix
Abstract
We develop a method to analyze galaxy peculiar velocity data using a Bayesian approach based around the radial velocity covariance matrix. Our method is designed to utilize more information from velocity measurements than other commonly used probes, such as the bulk flow, while still being insensitive to small-scale, nonlinear motions. Using data from the CosmicFlows3 compendium of measured peculiar velocities, we are able to use our method to put constraints on the amplitude of the density power spectrum on large scales, thus providing a test of the cosmological standard model.
- Publication:
-
American Astronomical Society Meeting Abstracts #233
- Pub Date:
- January 2019
- Bibcode:
- 2019AAS...23335603P