Supervoids in the WISE-2MASS catalogue imprinting Cold Spots in the Cosmic Microwave Background
Fabio Finelli, Juan Garcia-Bellido, Andras Kovacs, Francesco Paci and, Istvan Szapudi

TL;DR
This study links large supervoids identified in the WISE-2MASS galaxy catalog to Cold Spots in the CMB, suggesting supervoids may contribute to observed temperature decrements through secondary anisotropies.
Contribution
Develops spherically symmetric LTB supervoid models to explain CMB Cold Spots, highlighting the potential role of supervoids in secondary anisotropies and providing a new approach to understanding these features.
Findings
The Draco Supervoid can account for the CMB decrement via ISW and RS effects.
The Cold Spot's deep decrement is not fully explained by a supervoid alone.
Alignment probability between the Cold Spot and supervoids is low, indicating a possible causal link.
Abstract
The Cold Spot (CS) is a clear feature in the Cosmic Microwave Background (CMB); it could be of primordial origin, or caused by a intervening structure along the line of sight. We identified a large projected underdensity in the recently constructed WISE-2MASS all-sky infrared galaxy catalogue aligned with the Cold Spot direction at . It has an angular size of tens of degrees, and shows a galaxy underdensity in the center. Moreover, we find another large underdensity in the projected WISE-2MASS galaxy map at (hereafter Draco Supervoid), also aligned with a CMB decrement, although less significant than that of the CS direction. Motivated by these findings, we develop spherically symmetric Lemaitre-Tolman-Bondi (LTB) compensated void models to explain the observed CMB decrements with these two underdensities,…
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