Naidoo, K;
Benoit-Levy, A;
Lahav, O;
(2016)
Could multiple voids explain the cosmic microwave background Cold Spot anomaly?
Monthly Notices of The Royal Astronomical Society
, 459
(1)
L71-L75.
10.1093/mnrasl/slw043.
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Abstract
Understanding the observed Cold Spot (CS, temperature of ∼ − 150 μK at its centre) on the cosmic microwave background is an outstanding problem. Explanations vary from assuming it is just a ≳3σ primordial Gaussian fluctuation to the imprint of a supervoid via the Integrated Sachs–Wolfe and Rees–Sciama (ISW+RS) effects. Since single spherical supervoids cannot account for the full profile, the ISW+RS of multiple line-of-sight voids is studied here to mimic the structure of the cosmic web. Two structure configurations are considered. The first, through simulations of 20 voids, produces a central mean temperature of ∼ − 50 μK. In this model the central CS temperature lies at ∼2σ but fails to explain the CS hot ring. An alternative multivoid model (using more pronounced compensated voids) produces much smaller temperature profiles, but contains a prominent hot ring. Arrangements containing closely placed voids at low redshift are found to be particularly well suited to produce CS-like profiles. We then measure the significance of the CS if CS-like profiles (which are fitted to the ISW+RS of multivoid scenarios) are removed. The CS tension with the Λ cold dark matter model can be reduced dramatically for an array of temperature profiles smaller than the CS itself.
| Type: | Article |
|---|---|
| Title: | Could multiple voids explain the cosmic microwave background Cold Spot anomaly? |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnrasl/slw043 |
| Publisher version: | http://doi.org/10.1093/mnrasl/slw043 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Astronomy & Astrophysics, cosmic background radiation, large-scale structure of Universe, ANISOTROPY-PROBE, NON-GAUSSIANITY, LOCAL VOIDS, SUPERSTRUCTURES, IMPRINT, ORIGIN, WMAP, SUPERVOIDS, CATALOG, PLANCK |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1541740 |
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