North-South non-Gaussian asymmetry in PLANCK CMB maps - INSPIRE

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North-South non-Gaussian asymmetry in PLANCK CMB maps

Apr 10, 2014

12 pages

Published in:

JCAP 10 (2014) 041

Published: Oct 16, 2014

e-Print:

1404.2936 [astro-ph.CO]

DOI:

10.1088/1475-7516/2014/10/041

View in:

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Abstract: (IOP)

We report the results of a statistical analysis performed with the four foreground-cleaned Planck maps by means of a suitably defined local-variance estimator. Our analysis shows a clear dipolar structure in Planck's variance map pointing in the direction (l,b) simeq (220°,-32°), thus consistent with the North-South asymmetry phenomenon. Surprisingly, and contrary to previous findings, removing the CMB quadrupole and octopole makes the asymmetry stronger. Our results show a maximal statistical significance, of 98.1% CL, in the scales ranging from ℓ=4 to ℓ=500. Additionally, through exhaustive analyses of the four foreground-cleaned and individual frequency Planck maps, we find unlikely that residual foregrounds could be causing this dipole variance asymmetry. Moreover, we find that the dipole gets lower amplitudes for larger masks, evidencing that most of the contribution to the variance dipole comes from a region near the galactic plane. Finally, our results are robust against different foreground cleaning procedures, different Planck masks, pixelization parameters, and the addition of inhomogeneous real noise.

Note:

19 pages, 13 figures. Re-submitted to match published version

non-gaussianity
CMBR theory
cosmological parameters from CMBR

References(97)

Figures(16)

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