Foreground removal with ILC methods for AliCPT-1

Dou, Jiazheng; Ghosh, Shamik; Santos, Larissa; Zhao, Wen

doi:10.1088/1475-7516/2024/05/006

Title: Foreground removal with ILC methods for AliCPT-1

Journal Article · 02 May 2024 · Journal of Cosmology and Astroparticle Physics

DOI: https://doi.org/10.1088/1475-7516/2024/05/006 · OSTI ID:2427294

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Univ. of Science and Technology of China, Hefei (China)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Yangzhou Univ., Jiangsu (China)

One of the main goals of most future CMB experiments is the precise measurement of CMB B-mode polarization, whose major obstacle is the Galactic foregrounds. In this paper, we evaluate the foreground cleaning performance of the variants of the ILC method on partial sky B-modes and analyze the main sources of biases on the BB power spectrum. Specially, we compare the NILC, the cILC (in three domains) and the cMILC methods for AliCPT-1 simulations. We find that the cILC methods implemented in harmonic space and needlet space are both competent to clean different models of foregrounds, which bias the tensor-to-scalar ratio about 0.008 at maximum, and constrain the tensor-to-scalar ratio to r < 0.043(95%CL) for the AliCPT-1 configuration. We also note that the deviation of the estimated noise bias from the actual one for ILC, dubbed the noise bias error (NBE) in this paper, might make significant effects on the power spectrum for a small footprint and low signal-to-noise ratio CMB experiment. We finally obtain its relation with respect to the noise residual which fits well with the simulated results.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); National Key R&D Program of China; National Natural Science Foundation of China (NSFC); Fundamental Research Funds for the Central Universities

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2427294

Journal Information:: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 05 Vol. 2024; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Foreground removal with ILC methods for AliCPT-1

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