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Cosmological parameters from the comparison of peculiar velocities with predictions from the 2M++ density field

Published online by Cambridge University Press:  12 October 2016

Michael J. Hudson ,
Jonathan Carrick ,
Stephen J. Turnbull  and
Guilhem Lavaux
Michael J. Hudson
Affiliation:
Department of Physics & Astronomy, University of Waterloo, Waterloo, ON, N2L 3G1, Canada Perimeter Institute for Theoretical Physics, 31 Caroline St. N., Waterloo, ON, N2L 2Y5, Canada
Jonathan Carrick
Affiliation:
Department of Physics & Astronomy, University of Waterloo, Waterloo, ON, N2L 3G1, Canada
Stephen J. Turnbull
Affiliation:
Department of Physics & Astronomy, University of Waterloo, Waterloo, ON, N2L 3G1, Canada
Guilhem Lavaux
Affiliation:
Department of Physics & Astronomy, University of Waterloo, Waterloo, ON, N2L 3G1, Canada Perimeter Institute for Theoretical Physics, 31 Caroline St. N., Waterloo, ON, N2L 2Y5, Canada CNRS, UMR7095, Institut d'Astrophysique de Paris, F-75014, Paris, France Sorbonne Universités, UPMC Univ Paris 06, UMR7095, Institut d'Astrophysique de Paris, F-75014, Paris, France Canadian Institute for Theoretical Astrophysics, University of Toronto, 60 St. George Street, Toronto, ON M5S 1A7, Canada email: [email protected]
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Abstract

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Using redshifts from the 2M++ redshift compilation, we reconstruct the density of galaxies within 200 h−1 Mpc, and compare the predicted peculiar velocities Tully-Fisher and SNe peculiar velocities. The comparison yields a best-fit value of β ≡ Ωm0.55/b* = 0.431 ± 0.021, suggesting Ωm0.55σ8,lin = 0.401 ± 0.024, in good agreement with other probes. The predicted peculiar velocity of the Local Group from sources within the 2M++ volume is 540 ± 40 km s−1, towards l = 268° ± 4°, b = 38° ± 6°, which is misaligned by only 10° with the Cosmic Microwave Background dipole. To account for sources outside the 2M++ volume, we fit simultaneously for β* and an external bulk flow in our analysis. The external bulk flow has a velocity of 159 ± 23 km s−1 towards l = 304° ± 11°, b6° ± 13°.

Keywords

galaxies: distances and redshiftslarge-scale structure of universecosmological parametersdark matter
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S308: The Zeldovich Universe: Genesis and Growth of the Cosmic Web , June 2014 , pp. 318 - 321
Copyright
Copyright © International Astronomical Union 2016 

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