Detection of a supervoid aligned with the cold spot of the cosmic microwave background

I. Szapudi, András Kovács, Benjamin R. Granett, Z. Frei, Joseph Silk, Will Burgett, Shaun Cole, Peter W. Draper, Daniel J. Farrow, Nicholas Kaiser, Eugene A. Magnier, Nigel Metcalfe, Jeffrey S. Morgan, Paul Price, John Tonry, Richard Wainscoat

Research output: Contribution to journalArticle

44 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)288-294
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Volume450
Issue number1
DOIs
Publication statusPublished - Mar 27 2015

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galaxies
microwaves
catalogs
Wide-field Infrared Survey Explorer
radii
normal density functions
line of sight
voids
dark matter
void
color
causes
profiles
cold
microwave
detection
distribution
test

Keywords

  • Cosmic background radiation
  • Cosmology: observations
  • Large-scale structure of Universe
  • Surveys

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Detection of a supervoid aligned with the cold spot of the cosmic microwave background. / Szapudi, I.; Kovács, András; Granett, Benjamin R.; Frei, Z.; Silk, Joseph; Burgett, Will; Cole, Shaun; Draper, Peter W.; Farrow, Daniel J.; Kaiser, Nicholas; Magnier, Eugene A.; Metcalfe, Nigel; Morgan, Jeffrey S.; Price, Paul; Tonry, John; Wainscoat, Richard.

In: Monthly Notices of the Royal Astronomical Society, Vol. 450, No. 1, 27.03.2015, p. 288-294.

Research output: Contribution to journalArticle

Szapudi, I, Kovács, A, Granett, BR, Frei, Z, Silk, J, Burgett, W, Cole, S, Draper, PW, Farrow, DJ, Kaiser, N, Magnier, EA, Metcalfe, N, Morgan, JS, Price, P, Tonry, J & Wainscoat, R 2015, 'Detection of a supervoid aligned with the cold spot of the cosmic microwave background', Monthly Notices of the Royal Astronomical Society, vol. 450, no. 1, pp. 288-294. https://doi.org/10.1093/mnras/stv488
Szapudi, I. ; Kovács, András ; Granett, Benjamin R. ; Frei, Z. ; Silk, Joseph ; Burgett, Will ; Cole, Shaun ; Draper, Peter W. ; Farrow, Daniel J. ; Kaiser, Nicholas ; Magnier, Eugene A. ; Metcalfe, Nigel ; Morgan, Jeffrey S. ; Price, Paul ; Tonry, John ; Wainscoat, Richard. / Detection of a supervoid aligned with the cold spot of the cosmic microwave background. In: Monthly Notices of the Royal Astronomical Society. 2015 ; Vol. 450, No. 1. pp. 288-294.
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AU - Silk, Joseph

AU - Burgett, Will

AU - Cole, Shaun

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AU - Farrow, Daniel J.

AU - Kaiser, Nicholas

AU - Magnier, Eugene A.

AU - Metcalfe, Nigel

AU - Morgan, Jeffrey S.

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