Pavan K. Aluri, Pranati K. Rath, Pankaj Jain
In this paper we will study the presence of extended foreground correlation
features still present in the cleaned CMB map. It is customary to employ a
galctic mask on th cleaned CMB map to eliminate the galactic region still
contaminated even after cleaning. In this study we find that there are residual
foreground features still present outside a galactic mask, which could
potentially be responsible to some of the claimed large scale anomalies found
in CMB. We defined two correlation statistics, one in pixel space and the other
in multipole spcae. Pixel correlation statistic was used to convey a pictorial
impression of the level of foregrounds still present in the cleaned map. The
multipole correlation statistic was used to identify severly polluted modes in
a cleaned data. Using the pixel statistic, we find that there are significant
spatially extended features which are correlated with foregrounds. An
interesting feature we found is a significant positive correlation of the
anomalous cold spot region of the CMB map with synchrotron templates. When we
use a multipole statistic, we find that the low multipoles, particularly the
quadrupole is contaminated by synchrotron and dust.
View original:
http://arxiv.org/abs/1202.2678
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