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

Szapudi, I. and Kovács, A. and Granett, B. R. and Frei, Z. and Silk, J. and Burgett, W. and Cole, S. and Draper, P. W. and Farrow, D. J. and Kaiser, N. and Magnier, E. A. and Metcalfe, N. and Morgan, J. S. and Price, P. and Tonry, J. and 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). pp. 288-294.


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.

Item Type:Article
Keywords:Surveys, Cosmic background radiation, Cosmology: observations, Large-scale structure of Universe.
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Publisher 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.
Date accepted:04 March 2015
Date deposited:04 September 2015
Date of first online publication:16 April 2015
Date first made open access:No date available

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