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Article Dans Une Revue JCAP Année : 2017

Multipole analysis of redshift-space distortions around cosmic voids

Résumé

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 β at two median redshifts, β(bar z=0.32)=0.599(+0.134)(−)(0.124) and β(bar z=0.54)=0.457(+0.056)(−)(0.054), 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 2σ deviation at bar z=0.32, which increases to 3σ when the data is restricted to the lowest available redshift range of 0.15

Dates et versions

hal-01582894 , version 1 (06-09-2017)

Identifiants

Citer

Nico Hamaus, Marie-Claude Cousinou, Alice Pisani, Marie Aubert, Stéphanie Escoffier, et al.. Multipole analysis of redshift-space distortions around cosmic voids. JCAP, 2017, 07, pp.014. ⟨10.1088/1475-7516/2017/07/014⟩. ⟨hal-01582894⟩
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