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Evidence against a supervoid causing the CMB Cold Spot.

Mackenzie, Ruari and Shanks, Tom and Bremer, Malcolm N. and Cai, Yan-Chuan and Gunawardhana, Madusha L. P. and Kovács, András and Norberg, Peder and Szapudi, Istvan (2017) 'Evidence against a supervoid causing the CMB Cold Spot.', Monthly notices of the Royal Astronomical Society., 470 (2). pp. 2328-2338.


We report the results of the 2dF-VST ATLAS Cold Spot galaxy redshift survey (2CSz) based on imaging from VST ATLAS and spectroscopy from 2dF AAOmega over the core of the CMB Cold Spot. We sparsely surveyed the inner 5° radius of the Cold Spot to a limit of iAB ≤ 19.2, sampling ∼7000 galaxies at z < 0.4. We have found voids at z = 0.14, 0.26 and 0.30 but they are interspersed with small overdensities, and the scale of these voids is insufficient to explain the Cold Spot through the ΛCDM ISW effect. Combining with previous data out to z ∼ 1, we conclude that the CMB Cold Spot could not have been imprinted by a void confined to the inner core of the Cold Spot. Additionally, we find that our ‘control’ field GAMA G23 shows a similarity in its galaxy redshift distribution to the Cold Spot. Since the GAMA G23 line of sight shows no evidence of a CMB temperature decrement, we conclude that the Cold Spot may have a primordial origin rather than being due to line-of-sight effects.

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Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:13 April 2017
Date deposited:04 August 2017
Date of first online publication:25 April 2017
Date first made open access:04 August 2017

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