Quadrant asymmetry in the angular distribution of the Cosmic Microwave
  Background in the Planck satellite data
  Some peculiar features found in the angular distribution of the cosmic
microwave background (CMB) measured by the Wilkinson Microwave Anisotropy Probe
(WMAP) deserve further investigation. Among these peculiar features, is the
quadrant asymmetry, which is likely related to the north-south asymmetry. In
this paper, we aim to extend the analysis of the quadrant asymmetry in the
$\Lambda$CDM framework to the Planck foreground-cleaned maps, using the mask
provided by Planck team. We compute the two-point correlation function (TPCF)
from each quadrant of the Planck CMB sky maps, and compare the result with 1000
Monte Carlo (MC) simulations generated assuming the $\Lambda$CDM best-fit power
spectrum. We detect the presence of an excess of power in the southeastern
quadrant (SEQ) and a significant lack of power in the northeastern quadrant
(NEQ) in the Planck data. Asymmetries between the SEQ and the other three
quadrants (southwestern quadrant (SWQ), northwestern quadrant (NWQ), and NEQ)
are each in disagreement with an isotropic sky at a 95\% confidence level.
Furthermore, by rotating the Planck temperature sky map with respect to z
direction, we showed the rotation angle where the TPCF of the SEQ has its
maximal power. Our analysis of the Planck foreground-cleaned maps shows that
there is an excess of power in the TPCF in the SEQ and a significant lack of
power in the NEQ when compared with simulations. This asymmetry is anomalous
when considering the $\Lambda$CDM framework .
