4.6 Article

Multipole analysis of redshift-space distortions around cosmic voids

出版社

IOP Publishing Ltd
DOI: 10.1088/1475-7516/2017/07/014

关键词

cosmological parameters from LSS; cosmic web; galaxy clustering; redshift surveys

资金

  1. DFG cluster of excellence Origin and Structure of the Universe
  2. DFG [TRR 33]
  3. OCEVU LABEX [ANR-11-LABX-0060]
  4. A*MIDEX project [ANR-11-IDEX-0001-02]
  5. Investissements d'Avenir French government program
  6. French National Research Agency (ANR) [ANR-16-CE31-0021]
  7. Alfred P. Sloan Foundation
  8. Participating Institutions
  9. National Science Foundation
  10. U.S. Department of Energy Office of Science

向作者/读者索取更多资源

We perform a comprehensive redshift-space distortion analysis based on cosmic voids in the large-scale distribution of galaxies observed with the Sloan Digital Sky Survey. To this end, we measure multipoles of the void-galaxy cross-correlation function and compare them with standard model predictions in cosmology. Merely considering linear-order theory allows us to accurately describe the data on the entire available range of scales and to probe void-centric distances down to about 2 h(-1) Mpc. Common systematics, such as the Fingers-of-God effect, scale-dependent galaxy bias, and nonlinear clustering do not seem to play a significant role in our analysis. We constrain the growth rate of structure via the redshift-space distortion parameter beta at two median redshifts, beta (z = 0 : 32) = 0.599(-0.124)(+0.134) and beta(z = 0 : 54) = 0.457(- 0.054)(+ 0.056) , with a precision that is competitive with state-of-the-art galaxy-clustering results. While the high-redshift constraint perfectly agrees with model expectations, we observe a mild 2 sigma deviation at z = 0.32, which increases to 3 sigma when the data is restricted to the lowest available redshift range of 0.15 < z < 0.33.

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