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Testing the ABS Method with the Simulated Planck Temperature Maps

Research paper by Jian Yao, Le Zhang, Yuxi Zhao, Pengjie Zhang, Larissa Santos, Jun Zhang

Indexed on: 20 Dec '18Published on: 18 Dec '18Published in: The Astrophysical journal. Supplement series



Abstract

In this study, we apply the Analytical method of Blind Separation (ABS) of the cosmic microwave background (CMB) from foregrounds to estimate the CMB temperature power spectrum from multi-frequency microwave maps. We test the robustness of the ABS estimator and assess the accuracy of the power spectrum recovery using realistic simulations based on the seven-frequency Planck data, including various frequency-dependent and spatially varying foreground components (synchrotron, free–free, thermal dust, and anomalous microwave emission), as well as an uncorrelated Gaussian-distributed instrumental noise. Considering no prior information about the foregrounds, the ABS estimator can analytically recover the CMB power spectrum over almost all scales with less than 0.5% error for maps where the Galactic plane region ( ##IMG## [http://ej.iop.org/images/0067-0049/239/2/36/apjsaaef7aieqn1.gif] {$ b \lt 10^\circ $} ) is masked out. To further test the flexibility...