POWER ASYMMETRY IN WMAP AND PLANCK TEMPERATURE SKY MAPS AS MEASURED BY A LOCAL VARIANCE ESTIMATOR
By Yashar Akrami, Y. Fantaye, A. Shafieloo, H. Eriksen, F. Hansen, A. Banday, K. G'orski. 2014
144 citations recorded by the source corpus.
We revisit the question of hemispherical power asymmetry in the WMAP and Planck temperature sky maps by measuring the local variance over the sky and on disks of various sizes. For the 2013 Planck sky map we find that none of the 1000 available isotropic Planck “Full Focal Plane” simulations have a larger variance asymmetry than that estimated from the data, suggesting the presence of an anisotropic signature formally significant at least at the 3.3σ level. For the WMAP 9 year data we find that 5 out of 1000 simulations have a larger asymmetry. The preferred direction for the asymmetry from the Planck data is (l, b) = (212°, −13°), in good agreement with previous reports of the same hemispherical power asymmetry.
Subfields: Astronomy and Astrophysics, Statistical and Nonlinear Physics
View Paper: https://www.semanticscholar.org/paper/779b256b6a5c4ec4e9ca65a12fe3db03c1f24dee
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In Astronomy and Astrophysics
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In Statistical and Nonlinear Physics
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Citations in the corpus
- Probing cosmic isotropy with a new X-ray galaxy cluster sample through the LX–T scaling relation (2020, background): “…feature present in the CMB is the dipole power asymmetry detected in both WMAP and Planck with a significance of ∼ 2−3.5σ toward (l, b) ∼ (230◦,−20◦) (Eriksen et al. 2004; Hanson & Lewis 2009; Bennett et al. 2011; Akrami et al. 2014; Planck Collaboration XXIII 2014; Planck Collaboration XVI 2016).”
- Fundamental physics with the Square Kilometre Array (2018, methodology): “…components of angular correlations of CMB anisotropies with WMAP and Planck data on large scales (Hansen et al., 2004; Gordon et al., 2005; Eriksen et al., 2007; Gordon, 2007; Planck Collaboration et al., 2014b; Akrami et al., 2014; Planck Collaboration et al., 2016e,c; Aiola et al., 2015).”