Joint analysis of small-scale galaxy clustering and galaxy--galaxy lensing from BOSS galaxies
Wenhao Gao, Zhenjie Liu, Zhongxu Zhai, Jeremy L. Tinker, Jun Zhang, Arka Banerjee, Joseph DeRose, Hong Guo, Yao-Yuan Mao, Kate Storey-Fisher, Risa H. Wechsler

TL;DR
This paper combines galaxy clustering and lensing data from BOSS and other surveys using emulators based on N-body simulations to improve cosmological constraints, revealing tensions with CMB results and hinting at non-zero neutrino mass.
Contribution
It introduces a simulation-based emulator approach for joint clustering and lensing analysis, enhancing cosmological parameter constraints from BOSS data.
Findings
Improved constraints on S8 from combined clustering and lensing.
Detected tension of 1-4 sigma with Planck CMB results.
Hints of non-zero neutrino mass with current data.
Abstract
We present a joint analysis of galaxy clustering and galaxy--galaxy lensing measurements from BOSS galaxies using a simulation-based emulation method combined with a halo occupation distribution model. Our emulators are constructed with the Aemulus simulations, a suite of CDM -body simulations with massive neutrinos as independent particle species. We combine small-scale analysis of clustering from Mpc to Mpc and lensing from Mpc to Mpc to perform cosmological constraints. We split the BOSS galaxies into three redshift bins to measure their clustering and employ galaxies from Dark Energy Camera Legacy Survey and Hyper Suprime-Cam as source galaxies to measure lensing separately. We find that the addition of lensing significantly improves the constraining power on , with a weak improvement…
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Taxonomy
TopicsGalaxies: Formation, Evolution, Phenomena · Astronomy and Astrophysical Research · Gamma-ray bursts and supernovae
