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

  • Michael J. Hudson (a1) (a2), Jonathan Carrick (a1), Stephen J. Turnbull (a1) and Guilhem Lavaux (a1) (a2) (a3) (a4) (a5)

Abstract

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 ≡ Ωm 0.55/b* = 0.431 ± 0.021, suggesting Ωm 0.55σ8,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°.

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Proceedings of the International Astronomical Union
  • ISSN: 1743-9213
  • EISSN: 1743-9221
  • URL: /core/journals/proceedings-of-the-international-astronomical-union
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