Will kinematic Sunyaev-Zel'dovich measurements enhance the science return from galaxy redshift surveys?

Naonori S. Sugiyama, Teppei Okumura, David N. Spergel

Research output: Contribution to journalReview articlepeer-review

22 Scopus citations


Yes. Future CMB experiments such as Advanced ACTPol and CMB-S4 should achieve measurements with S/N of > 0.1 for the typical host halo of galaxies in redshift surveys. These measurements will provide complementary measurements of the growth rate of large scale structure f and the expansion rate of the Universe H to galaxy clustering measurements. This paper emphasizes that there is significant information in the anisotropy of the relative pairwise kSZ measurements. We expand the relative pairwise kSZ power spectrum in Legendre polynomials and consider up to its octopole. Assuming that the noise in the filtered maps is uncorrelated between the positions of galaxies in the survey, we derive a simple analytic form for the power spectrum covariance of the relative pairwise kSZ temperature in redshift space. While many previous studies have assumed optimistically that the optical depth of the galaxies τT in the survey is known, we marginalize over τT, to compute constraints on the growth rate f and the expansion rate H. For realistic survey parameters, we find that combining kSZ and galaxy redshift survey data reduces the marginalized 1-σ errors on H and f to ∼50-70% compared to the galaxy-only analysis.

Original languageEnglish (US)
Article number057
JournalJournal of Cosmology and Astroparticle Physics
Issue number1
StatePublished - Jan 30 2017

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics


  • Dark matter simulations
  • Dark matter theory
  • Galaxy clustering
  • Sunyaev-Zeldovich effect


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