I. Szapudi
Detection of a supervoid aligned with the cold spot of the cosmic microwave background
Szapudi, I.; Kovács, A.; Granett, B.R.; Frei, Z.; Silk, J.; Burgett, W.; Cole, S.; Draper, P.W.; Farrow, D.J.; Kaiser, N.; Magnier, E.A.; Metcalfe, N.; Morgan, J.S.; Price, P.; Tonry, J.; Wainscoat, R.
Authors
A. Kovács
B.R. Granett
Z. Frei
J. Silk
W. Burgett
Professor Shaun Cole shaun.cole@durham.ac.uk
Director of the Institute for Computational Cosmology
P.W. Draper
D.J. Farrow
N. Kaiser
E.A. Magnier
Dr Nigel Metcalfe nigel.metcalfe@durham.ac.uk
Assistant Professor
J.S. Morgan
P. Price
J. Tonry
R. Wainscoat
Abstract
We use the WISE-2MASS infrared galaxy catalogue matched with Pan-STARRS1 (PS1) galaxies to search for a supervoid in the direction of the cosmic microwave background (CMB) cold spot (CS). Our imaging catalogue has median redshift z ≃ 0.14, and we obtain photometric redshifts from PS1 optical colours to create a tomographic map of the galaxy distribution. The radial profile centred on the CS shows a large low-density region, extending over tens of degrees. Motivated by previous CMB results, we test for underdensities within two angular radii, 5°, and 15°. The counts in photometric redshift bins show significantly low densities at high detection significance, ≳5σ and ≳6σ, respectively, for the two fiducial radii. The line-of-sight position of the deepest region of the void is z ≃ 0.15–0.25. Our data, combined with an earlier measurement by Granett, Szapudi & Neyrinck, are consistent with a large Rvoid = (220 ± 50) h−1 Mpc supervoid with δm ≃ −0.14 ± 0.04 centred at z = 0.22 ± 0.03. Such a supervoid, constituting at least a ≃3.3σ fluctuation in a Gaussian distribution of the Λ cold dark matter model, is a plausible cause for the CS.
Citation
Szapudi, I., Kovács, A., Granett, B., Frei, Z., Silk, J., Burgett, W., …Wainscoat, R. (2015). Detection of a supervoid aligned with the cold spot of the cosmic microwave background. Monthly Notices of the Royal Astronomical Society, 450(1), 288-294. https://doi.org/10.1093/mnras/stv488
Journal Article Type | Article |
---|---|
Acceptance Date | Mar 4, 2015 |
Online Publication Date | Apr 16, 2015 |
Publication Date | Jun 11, 2015 |
Deposit Date | Aug 3, 2015 |
Publicly Available Date | Sep 4, 2015 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 450 |
Issue | 1 |
Pages | 288-294 |
DOI | https://doi.org/10.1093/mnras/stv488 |
Keywords | Surveys, Cosmic background radiation, Cosmology: observations, Large-scale structure of Universe. |
Public URL | https://durham-repository.worktribe.com/output/1424621 |
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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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