Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 488, Issue 4, Pages 5438-5451Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stz078
Keywords
methods: data analysis; galaxies: distances and redshifts; dark matter; large-scale structure of Universe; cosmology: observations
Categories
Funding
- Institut Universitaire de France
- CNES
- European Research Council (ERC) under the European Union [759194]
- European Research Council (ERC) [759194] Funding Source: European Research Council (ERC)
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A hierarchical Bayesian model is applied to the Cosmicflows-3 catalogue of galaxy distances in order to derive the peculiar velocity field and distribution of matter within z similar to 0.054. The model assumes the Lambda CDM model within the linear regime and includes the fit of the galaxy distances together with the underlying density field. By forward modelling the data, the method is able to mitigate biases inherent to peculiar velocity analyses, such as the Homogeneous Malmquist bias or the lognormal distribution of peculiar velocities. The statistical uncertainty on the recovered velocity field is about 150kms(-1) depending on the location, and we study systematics coming from the selection function and calibration of distance indicators. The resulting velocity field and related density fields recover the cosmography of the Local Universe which is presented in an unprecedented volume of our Universe 10times larger than previously reached. This methodology opens the doors to reconstruction of initial conditions for larger and more accurate constrained cosmological simulations. This work is also preparatory to larger peculiar velocity data sets coming from Wallaby, TAIPAN, or LSST.
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