2015/10/08 by Pavan K. Aluri, Nidhi Pant, Aluri, Pavan K. +5
Mathematics · Physics and Astronomy · #Cosmology and Gravitation Theories #Radio Astronomy Observations and Technology #Statistical and numerical algorithms #astro-ph.CO #astro-ph.IM
paper · pdf · doi:10.48550/arxiv.1510.02454
Submitted to Proceeding of 11th Rencontres du Vietnam on Cosmology - 50 years after CMB discovery, Quy Nhon, Vietnam (August 16-22, 2015)
arxiv created 2015/10/08 · arxiv updated 2015/10/09
Any isotropy violating phenomena on cosmic microwave background (CMB) induces off-diagonal correlations in the two-point function. These correlations themselves can be used to estimate the underlying anisotropic signals. Masking due to residual foregrounds, or availability of partial sky due to survey limitation, are unavoidable circumstances in CMB studies. But, masking induces additional correlations, and thus complicates the recovery of such signals. In this work, we discuss a procedure based on bipolar spherical harmonic (BipoSH) formalism to comprehensively addresses any spurious correlations induced by masking and successfully recover hidden signals of anisotropy in observed CMB maps. This method is generic, and can be applied to recover a variety of isotropy violating phenomena. Here, we illustrate the procedure by recovering the subtle Doppler boost signal from simulated boosted CMB skies, which has become possible with the unprecedented full-sky sensitivity of PLANCK probe.