Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2012-02-13
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
30 pages, 21 figures
Scientific paper
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.
Aluri Pavan K.
Jain Pankaj
Rath Pranati K.
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