Large scale directional anomalies in the WMAP 5yr ILC map

Journal Article · Mon Mar 01 04:00:00 EST 2010 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2010/03/019· OSTI ID:22273018

Gruppuso, Alessandro ^[1]

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1. INAF/IASF-BO, Istituto di Astrofisica Spaziale e Fisica Cosmica di Bologna, via Gobetti 101, I-40129 Bologna (Italy)

We study the alignments of the low multipoles of CMB anisotropies with specific directions in the sky (i.e. the dipole, the north Ecliptic pole, the north Galactic pole and the north Super Galactic pole). Performing 10{sup 5} random extractions we have found that: 1) separately quadrupole and octupole are mildly orthogonal to the dipole but when they are considered together, in analogy to Copi2006, we find an unlikely orthogonality at the level of 0.8% C.L.; 2) the multipole vectors associated to l = 4 are unlikely aligned with the dipole at 99.1% C.L.; 3) the multipole vectors associated to l = 5 are mildly orthogonal to the dipole but when we consider only maps that show exactly the same correlation among the multipoles as in the observed WMAP 5yr ILC, these multipole vectors are unlikely orthogonal to the dipole at 99.7% C.L.

• OSTI ID: 22273018
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 03 Vol. 2010; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ANISOTROPY
ASTROPHYSICS
CORRELATIONS
COSMOLOGY
DIPOLES
OCTUPOLES
RELICT RADIATION
VECTORS