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Cheng, C; Zhao, W; Huang, QG; Santos, L; Zhao, W (reprint author), Univ Sci & Technol China, Chinese Acad Sci, Dept Astron, CAS Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China.
Preferred axis of CMB parity asymmetry in the masked maps
Source PublicationPHYSICS LETTERS B
Language英语
AbstractBoth WMAP and Planck data show a significant odd-multipole preference in the large scales of the cosmic microwave background (CMB) temperature anisotropies. If this pattern originates from cosmological effects, then it can be considered a crucial clue for a violation in the cosmological principle. By defining various direction dependent statistics in the full-sky Planck 2015 maps (see, for instance, Naselsky et al. (2012); W. Zhao (2014)), we found that the CMB parity asymmetry has a preferred direction, which is independent of the choices of the statistics. In particular, this preferred axis is strongly aligned with those in the CMB quadrupole and octopole, as well as that in the CMB kinematic dipole, which hints to their non-cosmological origin. In realistic observations, the foreground residuals are inevitable, and should be properly masked out in order to avoid possible misinterpretation of the results. In this paper, we extend our previous analyses to the masked Planck 2015 data. By defining a similar direction dependent statistic in the masked map, we find a preferred direction of the CMB parity asymmetry, in which the axis also coincides with that found in the full-sky analysis. Therefore, our conclusions on the CMB parity violation and its directional properties are confirmed. (C) 2016 The Authors. Published by Elsevier B.V.
2016
Volume757Pages:445-453
Subject AreaAstronomy & Astrophysics ; Physics
DOIhttp://dx.doi.org/10.1016/j.physletb.2016.04.030
Indexed BySCI
Funding OrganizationProject 973 [2012CB821804] ; Project 973 [2012CB821804] ; Project 973 [2012CB821804] ; Project 973 [2012CB821804] ; NSFC [11173021, 11322324, 11421303, 11322545, 11335012, 11575271, 11447613] ; NSFC [11173021, 11322324, 11421303, 11322545, 11335012, 11575271, 11447613] ; NSFC [11173021, 11322324, 11421303, 11322545, 11335012, 11575271, 11447613] ; NSFC [11173021, 11322324, 11421303, 11322545, 11335012, 11575271, 11447613] ; Chinese Academy of Science ; Chinese Academy of Science ; Chinese Academy of Science ; Chinese Academy of Science ; Top-Notch Young Talents Program of China ; Top-Notch Young Talents Program of China ; Top-Notch Young Talents Program of China ; Top-Notch Young Talents Program of China
Citation statistics
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/21622
Collection理论物理所科研产出_SCI论文
Corresponding AuthorZhao, W (reprint author), Univ Sci & Technol China, Chinese Acad Sci, Dept Astron, CAS Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China.
Recommended Citation
GB/T 7714
Cheng, C,Zhao, W,Huang, QG,et al. Preferred axis of CMB parity asymmetry in the masked maps[J]. PHYSICS LETTERS B,2016,757:445-453.
APA Cheng, C,Zhao, W,Huang, QG,Santos, L,&Zhao, W .(2016).Preferred axis of CMB parity asymmetry in the masked maps.PHYSICS LETTERS B,757,445-453.
MLA Cheng, C,et al."Preferred axis of CMB parity asymmetry in the masked maps".PHYSICS LETTERS B 757(2016):445-453.
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