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A Supervoid Explanation of the Cosmic Microwave Background Cold Spot

Published online by Cambridge University Press:  01 July 2015

F. Finelli ,
J. García-Bellido ,
A. Kovács ,
F. Paci  and
I. Szapudi
F. Finelli
Affiliation:
INAF-IASF Bologna, Istituto di Astrofisica Spaziale e Fisica Cosmica di Bologna Istituto Nazionale di Astrofisica, via Gobetti 101, I-40129 Bologna, Italy INFN, Sezione di Bologna, Via Irnerio 46, I-40126 Bologna, Italy
J. García-Bellido
Affiliation:
Instituto de Física Teórica IFT-UAM/CSIC, Universidad Autónoma de Madrid, Cantoblanco 28049 Madrid, Spain
A. Kovács
Affiliation:
Institute of Physics, ELTE, 1117 Pázmány Péter sétány 1/A Budapest, Hungary
F. Paci
Affiliation:
SISSA, Astrophysics Sector, Via Bonomea 265, 34136, Trieste, Italy
I. Szapudi
Affiliation:
Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI, 96822
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Abstract

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The Cold Spot is an anomalously cold region in the Cosmic Microwave Background (Vielva et al. 2004), either caused by a structure in the line of sight or could be of primordial origin. We search for a supervoid aligned with the Cold Spot region, filling the gap in redshift at z<0.3 which has never been explored in details. We find a large projected under density in the recently constructed WISE-2MASS catalogue, whose median redshift is z ≃ 0.14, with an angular size of 30 degrees. We show that a spherically symmetric Lemaitre-Tolman-Bondi (LTB) void model can simultaneously fit the δgal/b=δ2D≃ −0.12 underdensity in the WISE-2MASS catalogue, and the Cold Spot as observed by both the WMAP and Planck satellites. Such an LTB supervoid gives a plausible explanation of the Cold Spot anomaly, and is preferred over the null hypothesis or a texture model.

Keywords

cosmic microwave backgroundobservationslarge-scale structure of universe
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Symposium S306: Statistical Challenges in 21st Century Cosmology , May 2014 , pp. 153 - 155
Copyright
Copyright © International Astronomical Union 2015 

References

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