Cosmology from weak lensing, galaxy clustering, CMB lensing, and tSZ – I. 10 × 2pt modelling methodology

Xiao Fang, Elisabeth Krause, Tim Eifler, Simone Ferraro, Karim Benabed, R. S. Pranjal, Emma Ayçoberry, Yohan Dubois, Vivian Miranda

Research output: Contribution to journalArticlepeer-review

Abstract

The overlap of galaxy surveys and cosmic microwave background (CMB) experiments presents an ideal opportunity for joint cosmological data set analyses. In this paper we develop a halo model-based method for the first joint analysis combining these two experiments using 10 correlated two-point functions (10 × 2pt) derived from galaxy position, galaxy shear, CMB lensing convergence, and Compton-y fields. We explore this method using the Vera Rubin Observatory Legacy Survey of Space and Time (LSST) and the Simons Observatory (SO) as examples. We find such LSS × CMB joint analyses lead to significant improvement in Figure-of-Merit of Ωm and S8 over the constraints from using LSS-only probes within л cold dark matter (лCDM) model. We identify that the shear–y and y–y correlations are the most valuable additions when thermal Sunyaev–Zel’dolvich (tSZ) is included. We further identify the dominant sources of halo model uncertainties in the small-scale modelling, and investigate the impact of halo self-calibration due to the inclusion of small-scale tSZ information.

Original languageEnglish (US)
Pages (from-to)9581-9593
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Volume527
Issue number4
DOIs
StatePublished - Feb 1 2024

Keywords

  • cosmic background radiation
  • cosmological parameters
  • cosmology: theory
  • large-scale structure of Universe

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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