The growth rate of cosmic structure from peculiar velocities at low and high redshifts - INSPIRE

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The growth rate of cosmic structure from peculiar velocities at low and high redshifts

Michael J. Hudson
(
- Waterloo U.
)
,
Stephen J. Turnbull
(
- Waterloo U.
)

Mar, 2012

5 pages

Published in:

Astrophys.J.Lett. 751 (2013) L30

e-Print:

1203.4814 [astro-ph.CO]

DOI:

10.1088/2041-8205/751/2/L30

View in:

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Abstract: (arXiv)

Peculiar velocities are an important probe of the growth rate of mass density fluctuations in the Universe. Most previous studies have focussed exclusively on measuring peculiar velocities at intermediate (

0.2 < z < 1

) redshifts using statistical redshift-space distortions. Here we emphasize the power of peculiar velocities obtained directly from distance measurements at low redshift (

z \lesssim 0.05

), and show that these data break the usual degeneracies in the \Omega_{m,0} --

\sigma_{8,0}

parameter space. Using only peculiar velocity data, we find

\Omega_{m,0} = 0.259\pm0.045

and

\sigma_{8,0} = 0.748\pm0.035

. Fixing the amplitude of fluctuations at very high redshift using observations of the Cosmic Microwave Background (CMB), the same data can be used to constrain the growth index

\gamma

, with the strongest constraints coming from peculiar velocity measurements in the nearby Universe. We find

\gamma = 0.619\pm 0.054

, consistent with LCDM. Current peculiar velocity data already strongly constrain modified gravity models, and will be a powerful test as data accumulate.

Note:

5 pages, 3 figures, 2 tables. ApJ Letters, in press. Updated analysis now includes BOSS and 6dFGS data

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