Multipole analysis of redshift-space distortions around cosmic voids

Abstract

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 $2h^{-1}\mathrm{Mpc}$. 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, $\beta (\bar{z}=0.32)=0.599_{-0.124}^{+0.134}$ and $\beta (\bar{z}=0.54)=0.457_{-0.054}^{+0.056}$, 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 $\bar{z}=0.32$, which increases to $3\sigma$ when the data is restricted to the lowest available redshift range of $0.15<z<0.33$.

20 pages, 11 figures. Minor fixes, conclusions unchanged. Reflects published version

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