Journal article · Preprint article
Planck intermediate results: LIII. Detection of velocity dispersion from the kinetic Sunyaev-Zeldovich effect : LIII. Detection of velocity dispersion from the kinetic Sunyaev-Zeldovich effect
Université Paris-Saclay1
University of Manchester2
Sorbonne Université3
University of Milan4
Polish Academy of Sciences5
University of Toronto6
University of California at Berkeley7
University of Ferrara8
Cardiff University9
University of Sussex10
Princeton University11
University of Oslo12
Université Grenoble Alpes13
University of British Columbia14
California Institute of Technology15
National Research Council of Italy16
University of Rome La Sapienza17
Université Paris 718
Imperial College London19
Institut d’Astrophysique de Paris20
European Space Agency - ESA21
Max Planck Institute for Astrophysics22
University of Cambridge23
Université PSL24
Stellenbosch University25
National Institute for Nuclear Physics26
Astrophysics and Atmospheric Physics, National Space Institute, Technical University of Denmark27
National Space Institute, Technical University of Denmark28
National Institute for Astrophysics29
Haverford College30
Université Paris-Sud31
Heidelberg University 32
Agenzia Spaziale Italiana33
Université Fédérale Toulouse Midi-Pyrénées34
Radboud University Nijmegen35
Max Planck Institute36
Université Paris Cité37
Instituto de Astrofísica de Canarias38
University of Helsinki39
Universita di Padova40
ESTEC41
Osservatorio Astronomico di Trieste42
University of Oviedo43
Universitá degli Studi di Milano44
International School for Advanced Studies45
Universidad de Cantabria46
University of Rome Tor Vergata47
CNRS48
University of California at Santa Barbara49
University of the Western Cape50
CSIC51
University of Padua52
Indian Institute of Science Education and Research Thiruvananthapuram53
...and 43 moreUsing 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.
| Language: | English |
|---|---|
| Publisher: | EDP Sciences S A |
| Year: | 2018 |
| Pages: | A48 |
| ISSN: | 14320746 and 00046361 |
| Types: | Journal article and Preprint article |
| DOI: | 10.1051/0004-6361/201731489 |
| ORCIDs: | Oxborrow, C. A. |
Cosmic background radiation Galaxies: clusters: general Large-scale structure of Universe Methods: data analysis
