Planck intermediate results: LIII. Detection of velocity dispersion from the kinetic Sunyaev-Zeldovich effect

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • N. Aghanim
  • Y. Akrami
  • M. Ashdown
  • J. Aumont
  • C. Baccigalupi
  • M. Ballardini
  • A. J. Banday
  • R. B. Barreiro
  • N. Bartolo
  • S. Basak
  • R. Battye
  • K. Benabed
  • J. P. Bernard
  • M. Bersanelli
  • P. Bielewicz
  • J. R. Bond
  • J. Borrill
  • F. R. Bouchet
  • C. Burigana
  • E. Calabrese
  • J. Carron
  • H. C. Chiang
  • B. Comis
  • D. Contreras
  • B. P. Crill
  • A. Curto
  • F. Cuttaia
  • P. De Bernardis
  • A. De Rosa
  • G. De Zotti
  • J. Delabrouille
  • E. Di Valentino
  • C. Dickinson
  • J. M. Diego
  • O. Doré
  • A. Ducout
  • X. Dupac
  • F. Elsner
  • T. A. Enßlin
  • H. K. Eriksen
  • E. Falgarone
  • Y. Fantaye
  • F. Finelli
  • F. Forastieri
  • M. Frailis
  • A. A. Fraisse
  • E. Franceschi
  • J. Kim
  • Y. Z. Ma

Research units

  • Universite Paris-Sud
  • Leiden University
  • University of Oslo
  • University of Cambridge
  • Kavli Institute for Cosmology Cambridge
  • IRAP
  • International School for Advanced Studies
  • University of the Western Cape
  • CNR-ENEA-EURATOM Association
  • CNRS Centre National de la Recherche Scientifique
  • Instituto de Física de Cantabria (CSIC-Universidad de Cantabria)
  • Università Degli Studi di Padova
  • Sezione di Padova
  • Indian Institute of Science Education and Research Thiruvananthapuram
  • University of Manchester
  • Institut d 'Astrophysique de Paris
  • UMR7095
  • University of Milano
  • INAF/IASF Milano
  • Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences
  • University of Toronto
  • Lawrence Berkeley National Laboratory
  • University of California at Berkeley
  • University of Ferrara
  • Istituto di Astrofisica Spaziale e Fisica Cosmica di Bologna
  • Universit'a di Rome Sapienza
  • Cardiff University
  • University of Sussex
  • University of KwaZulu-Natal
  • Princeton University
  • CNRS/IN2P3
  • University of British Columbia
  • California Institute of Technology
  • Jet Propulsion Laboratory, California Institute of Technology
  • University of Rome La Sapienza
  • INAF - Osservatorio Astronomico di Padova
  • Université Sorbonne Paris Cité
  • Imperial College London
  • European Space Agency - ESA
  • Max-Planck-Institut für Astrophysik
  • PSL Research University
  • African Institute for Mathematical Sciences
  • University of Stellenbosch
  • Osservatorio Astronomico di Trieste
  • Jodrell Bank Centre for Astrophysics
  • University of Helsinki
  • Simon Fraser University
  • University of Chicago
  • NORDITA
  • Stockholm University
  • University of Warsaw
  • Sun Yat-Sen University
  • University of Geneva
  • University of California at Santa Barbara
  • University College London
  • University of Rome Tor Vergata
  • Agenzia Spaziale Italiana
  • Danmarks Tekniske Universitet
  • Haverford College
  • CNRS
  • Institut für Theoretische Astrophysik
  • Radboud University Nijmegen
  • University of La Laguna
  • Instituto Astrofisico de Canarias
  • Space Research Institute, Russian Academy of Sciences
  • ESTEC - European Space Research and Technology Centre
  • Università Degli Studi di Trieste
  • University of Oviedo
  • University of Illinois at Urbana-Champaign
  • University of California at San Diego

Abstract

Using the Planck full-mission data, we present a detection of the temperature (and therefore velocity) dispersion due to the kinetic Sunyaev-Zeldovich (kSZ) effect from clusters of galaxies. To suppress the primary CMB and instrumental noise we derive a matched filter and then convolve it with the Planck foreground-cleaned "2D-ILC" maps. By using the Meta Catalogue of X-ray detected Clusters of galaxies (MCXC), we determine the normalized rms dispersion of the temperature fluctuations at the positions of clusters, finding that this shows excess variance compared with the noise expectation. We then build an unbiased statistical estimator of the signal, determining that the normalized mean temperature dispersion of 1526 clusters is ((ΔT/T)2) = (1.64 ± 0.48) × 10-11. However, comparison with analytic calculations and simulations suggest that around 0.7 σ of this result is due to cluster lensing rather than the kSZ effect. By correcting this, the temperature dispersion is measured to be ((ΔT/T)2) = (1.35 ± 0.48) × 10-11, which gives a detection at the 2.8 σ level. We further convert uniform-weight temperature dispersion into a measurement of the line-of-sight velocity dispersion, by using estimates of the optical depth of each cluster (which introduces additional uncertainty into the estimate). We find that the velocity dispersion is (υ2) = (123 000 ± 71 000) (km s-1)2, which is consistent with findings from other large-scale structure studies, and provides direct evidence of statistical homogeneity on scales of 600 h-1 Mpc. Our study shows the promise of using cross-correlations of the kSZ effect with large-scale structure in order to constrain the growth of structure.

Details

Original languageEnglish
Article numberA48
Pages (from-to)1-17
JournalAstronomy and Astrophysics
Volume617
Publication statusPublished - 1 Sep 2018
MoE publication typeA1 Journal article-refereed

    Research areas

  • Cosmic background radiation, Galaxies: clusters: general, Large-scale structure of Universe, Methods: data analysis

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