Removing a hidden foreground leakage from harmonic space ILC algorithm and analysis of Planck and WMAP data
by
Prof.Rajib Saha(IISER-Bhopal)
→
Asia/Kolkata
A304
A304
Description
We discover usual harmonic space Internal-Linear-Combination (ILC) algorithm for foreground minimization inevitably contaminates its outcome by a hitherto unaccounted for leakage signal that arise due to foreground components. We propose a method to nullify the leakage and apply the improved ILC algorithm on Planck-2015 and WMAP 9-year data. We discuss a few other improvements of the harmonic space ILC algorithm. Our CMB cleaned map and its angular power spectrum agrees with Planck published results with some differences at different multipole ranges.
