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- W2759641966 abstract "The combination of galaxy-galaxy lensing (GGL) with galaxy clustering is one of the most promising routes to determining the amplitude of matter clustering at low redshifts. We show that extending clustering+GGL analyses from the linear regime down to $sim 0.5 , h^{-1}$ Mpc scales increases their constraining power considerably, even after marginalizing over a flexible model of non-linear galaxy bias. Using a grid of cosmological N-body simulations, we construct a Taylor-expansion emulator that predicts the galaxy autocorrelation $xi_{text{gg}}(r)$ and galaxy-matter cross-correlation $xi_{text{gm}}(r)$ as a function of $sigma_8$, $Omega_m$, and halo occupation distribution (HOD) parameters, which are allowed to vary with large scale environment to represent possible effects of galaxy assembly bias. We present forecasts for a fiducial case that corresponds to BOSS LOWZ galaxy clustering and SDSS-depth weak lensing (effective source density $sim 0.3$ arcmin$^{-2}$). Using tangential shear and projected correlation function measurements over $0.5 leq r_p leq 30 , h^{-1}$ Mpc yields a 1.8% constraint on the parameter combination $sigma_8Omega_m^{0.58}$, a factor of two better than a constraint that excludes non-linear scales ($r_p > 2 , h^{-1}$ Mpc, $4 , h^{-1}$ Mpc for $gamma_t,w_p$). Much of this improvement comes from the non-linear clustering information, which breaks degeneracies among HOD parameters that would otherwise degrade the inference of matter clustering from GGL. Increasing the effective source density to $3$ arcmin$^{-2}$ sharpens the constraint on $sigma_8Omega_m^{0.58}$ by a further factor of two. With robust modeling into the non-linear regime, low-redshift measurements of matter clustering at the 1-percent level with clustering+GGL alone are well within reach of current data sets such as those provided by the Dark Energy Survey." @default.
- W2759641966 created "2017-10-06" @default.
- W2759641966 creator A5033684729 @default.
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- W2759641966 date "2018-08-25" @default.
- W2759641966 modified "2023-10-14" @default.
- W2759641966 title "Emulating galaxy clustering and galaxy–galaxy lensing into the deeply non-linear regime: methodology, information, and forecasts" @default.
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- W2759641966 doi "https://doi.org/10.1093/mnras/sty2258" @default.
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