Cosmic Flows

Density and Peculiar Velocity Fields in the Nearby Universe

We present a model for the density and predicted peculiar velocity fields within 200 Mpc/h. This model can be used to estimate the density within a depth of 200 Mpc/h. It can also be used to calculate predicted peculiar velocities within the same volume. These predictions can also be used to correct observed redshifts for the effects of peculiar motions restoring them to the Hubble flow. This has applications for SNe and measurements of the Hubble constant.

images/SG6.png

The density field in the Supergalactic Plane, smoothed with a 10 Mpc/h Gaussian

Data

The density field is based on the 2M++ redshift compilation, which in turn is based on the 2MRS, 6dF and SDSS redshift surveys. Self-consistent distances to all galaxies are calculated consistent with their observed redshifts and linear perturbation theory.

Download

From the download page, you can obtain the density and peculiar velocity fields in ASCII or numpy format.

Distances to galaxies and clusters

Coming soon! Stay tuned for updates.

How to acknowledge

Please citing the following papers:

  • "Cosmological parameters from the comparison of peculiar velocities with predictions from the 2M++ density field", Carrick J., Turnbull S., Lavaux G. & Hudson M. J., MNRAS, 2015. (ADS, MNRAS, arXiV)

A BiBTeX file with the above references can be downloaded here.

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© 2014-2015 Guilhem Lavaux, Michael J. Hudson, Jon Carrick & Stephen Turnbull
Please use closest mirror: France or Canada
Last updated: April 21, 2015