Hostname: page-component-76fb5796d-vvkck Total loading time: 0 Render date: 2024-04-26T22:06:01.849Z Has data issue: false hasContentIssue false
  • English
  • Français

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: mjhudson@uwaterloo.ca
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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 

References

Abazajian, K. N. et al., 2009, ApJS, 182, 543 Google Scholar
Böhringer, H., Chon, G., Bristow, M., & Collins, C. A., 2015, A&A, 574, A26 Google Scholar
Branchini, E. et al., 1999, MNRAS, 308, 1 Google Scholar
Carrick, J., Turnbull, S. J., Lavaux, G., & Hudson, M. J., 2015, MNRAS, 450, 317 Google Scholar
Davis, M., Nusser, A., Masters, K. L., Springob, C., Huchra, J. P., & Lemson, G., 2011, MNRAS, 413, 2906 Google Scholar
Hong, T. et al., 2014, MNRAS, 445, 402 CrossRefGoogle Scholar
Huchra, J. P. et al., 2012, ApJS, 199, 26 Google Scholar
Hudson, M. J. & Turnbull, S. J., 2012, ApJL, 751, L30 Google Scholar
Jones, D. H. et al., 2009, MNRAS, 399, 683 Google Scholar
Kilbinger, M., Fu, L., Heymans, C., Simpson, F., Benjamin, J., Erben, , & Harnois-Deraps, T., 2013, MNRAS, 430, 735 Google Scholar
Lavaux, G. & Hudson, M. J., 2011, MNRAS, 416, 2840 Google Scholar
Pike, R. W. & Hudson, M. J., 2005, ApJ, 635, 11 Google Scholar
Planck Collaboration et al., 2013, ArXiv e-printsGoogle Scholar
Planck Collaboration et al., 2015, ArXiv e-printsGoogle Scholar
Reichardt, C. L. et al., 2013, ApJ, 763, 127 Google Scholar
Rozo, E. et al., 2010, ApJ, 708, 645 Google Scholar
Springob, C. M., Masters, K. L., Haynes, M. P., Giovanelli, R., & Marinoni, C., 2007, ApJS, 172, 599 Google Scholar
Turnbull, S. J., Hudson, M. J., Feldman, H. A., Hicken, M., Kirshner, R. P., & Watkins, R., 2012, MNRAS, 420, 447 Google Scholar
Vikhlinin, A. et al., 2009, ApJ, 692, 1060 Google Scholar
Watkins, R., Feldman, H. A., & Hudson, M. J., 2009, MNRAS, 392, 743 CrossRefGoogle Scholar