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• W3105424954 endingPage "009" @default.
• W3105424954 startingPage "009" @default.
• W3105424954 abstract "We present a new model for the redshift-space power spectrum of galaxies and demonstrate its accuracy in modeling the monopole, quadrupole, and hexadecapole of the galaxy density field down to scales of $k = 0.4 hmathrm{Mpc}^{-1}$. The model describes the clustering of galaxies in the context of a halo model and the clustering of the underlying halos in redshift space using a combination of Eulerian perturbation theory and $N$-body simulations. The modeling of redshift-space distortions is done using the so-called distribution function approach. The final model has 13 free parameters, and each parameter is physically motivated rather than a nuisance parameter, which allows the use of well-motivated priors. We account for the Finger-of-God effect from centrals and both isolated and non-isolated satellites rather than using a single velocity dispersion to describe the combined effect. We test and validate the accuracy of the model on several sets of high-fidelity $N$-body simulations, as well as realistic mock catalogs designed to simulate the BOSS DR12 CMASS data set. The suite of simulations covers a range of cosmologies and galaxy bias models, providing a rigorous test of the level of theoretical systematics present in the model. The level of bias in the recovered values of $f sigma_8$ is found to be small. When including scales to $k = 0.4 hmathrm{Mpc}^{-1}$, we find 15-30% gains in the statistical precision of $f sigma_8$ relative to $k = 0.2 hmathrm{Mpc}^{-1}$ and a roughly 10-15% improvement for the perpendicular Alcock-Paczynski parameter $alpha_perp$. Using the BOSS DR12 CMASS mocks as a benchmark for comparison, we estimate an uncertainty on $f sigma_8$ that is $sim$10-20% larger than other similar Fourier-space RSD models in the literature that use $k leq 0.2 hmathrm{Mpc}^{-1}$, suggesting that these models likely have a too-limited parametrization." @default.
• W3105424954 created "2020-11-23" @default.
• W3105424954 creator A5024877946 @default.
• W3105424954 creator A5044703523 @default.
• W3105424954 creator A5078103211 @default.
• W3105424954 creator A5087071619 @default.
• W3105424954 date "2017-10-10" @default.
• W3105424954 modified "2023-10-06" @default.
• W3105424954 title "Extending the modeling of the anisotropic galaxy power spectrum to <i>k</i> = 0.4 <i>h</i>Mpc⁻¹" @default.
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