Forecasts on CMB lensing observations with AliCPT-1

Liu, Jinyi; Sun, Zeyang; Han, Jiakang; Carron, Julien; Delabrouille, J.; Li, Siyu; Liu, Yang; Jin, Jing; Ghosh, Shamik; Yue, Bin; Zhang, Pengjie; Feng, Chang; Huang, Zhiqi; Liu, Hao; Wu, Yiwen; Zhang, Le; Zi-Rui, Zhang,; Zhao, Wen; Hu, Bin; Li, Hong; Zhang, Xinmin

doi:10.1007/s11433-022-1966-4

Cited by 13 publications

(11 citation statements)

References 49 publications

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“…The inversion of the covariance matrix is computed via a conjugate-gradient inversion method with a multi-grid preconditioner [31], and contains both the foreground residual and the statistical noise. After the filtering, we combine the pair maps into the quadratic form according to the equations (3.4)-(3.8) listed in [5]. Due to the presence of mask and foreground residuals, there will be extra statistical anisotropies in the map even without any lensing signals.…”

Section: Lensing Reconstruction Resultsmentioning

confidence: 99%

“…This mask further removes sky regions based on galactic foreground emissions as estimated for Planck thermal dust and synchrotron polarized intensity maps. These foregrounds and noise union JCAP04(2023)063 As for comparison, we show the spectra with 25 µK • arcmin statistical noise in the right panels, which is similar to the mock data used in Liu22 [5]. The foregrounds and statistical noise are denoted as 'fg' and 'noise', respectively.…”

Section: The Cilc Pipelinementioning

confidence: 91%

“…For comparison, we show in the right panels of figure 3 the mock data, which has similar noise level as those used in Liu22 [5]. One can see that the typical statistical noise is about 25µK • arcmin (red line in the right panels).…”

Section: Foreground Cleaning Efficacy and Preprocessing Pipelinementioning

confidence: 97%

“…Among these secondary science cases, CMB lensing is one of the promising topics. According to a previous study [5] (hereafter, we refer this paper as Liu22), AliCPT-1 can measure the lensing signal with high significance, especially via polarization data. For lensing reconstruction, with 1-year of observation, the Liu22 result shows that the 150 GHz channel is able to measure the lensing signal with 15σ significance via the quadratic minimum-variance estimator, with the polarization data contributing 6.6σ.…”

Section: Introductionmentioning

confidence: 99%

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Forecasts of CMB lensing reconstruction of AliCPT-1 from the foreground cleaned polarization data

Han

Ghosh

et al. 2023

J. Cosmol. Astropart. Phys.

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The gravitational lensing distortion of Cosmic microwave background radiation (CMB) carries fruitful information of cosmic large-scale structure. However, CMB observations are unavoidably contaminated by emission from various extra-galactic foregrounds, which must be removed to obtain reliable measurements of the cosmological signal. In this paper, we demonstrate CMB lensing reconstruction in AliCPT-1 after foreground removal, combine the two bands of AliCPT-1 (90 and 150 GHz) with Planck HFI bands (100, 143, 217 and 353 GHz) and with the WMAP-K band (23 GHz). In order to balance contamination by instrumental noise and foreground residual bias, we adopt the Needlet Internal Linear Combination (NILC) method to clean the E-map and the constrained Internal Linear Combination (cILC) method to clean the B-map. The latter utilizes additional constraints on average frequency scaling of the dust and synchrotron to remove foregrounds at the expense of somewhat noisier maps. Assuming 4 modules observing 1 season from simulation data, the resulting effective residual noise in E- and B-map are roughly 15 μ K· arcmin and 25 μ K· arcmin, respectively. As a result, the CMB lensing reconstruction signal-to-noise ratio (SNR) from polarization data is about SNR≈4.5. This lensing reconstruction capability is comparable to that of other stage-III small aperture millimeter CMB telescopes.

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Section: Lensing Reconstruction Resultsmentioning

confidence: 99%

Section: The Cilc Pipelinementioning

confidence: 91%

Section: Foreground Cleaning Efficacy and Preprocessing Pipelinementioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Forecasts of CMB lensing reconstruction of AliCPT-1 from the foreground cleaned polarization data

Han

Ghosh

et al. 2023

J. Cosmol. Astropart. Phys.

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“…The Ali CMB Polarization Telescope (AliCPT) is the first Chinese CMB experiment. It will measure the CMB polarization in the northern hemisphere at 90 GHz and 150 GHz, located at Ali, in Tibet, China [40][41][42]. The key scientific objectives of the AliCPT project include producing the best CMB polarization observations of the northern sky, and making a significant detection of PGW using the high precision polarization data [43].…”

Section: Introduction To Science Objectivesmentioning

confidence: 99%

Performance forecasts for the primordial gravitational wave detection pipelines for AliCPT-1

Ghosh

Liu

Zhang

et al. 2022

J. Cosmol. Astropart. Phys.

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AliCPT is the first Chinese cosmic microwave background (CMB) experiment which will make the most precise measurements of the CMB polarization in the northern hemisphere. The key science goal for AliCPT is the detection of primordial gravitational waves (PGWs). It is well known that an epoch of cosmic inflation, in the very early universe, can produce PGWs, which leave an imprint on the CMB in form of odd parity B-mode polarization. In this work, we study the performance of the component separation and parameter estimation pipelines in context of constraining the value of the tensor-to-scalar ratio. Based on the simulated data for one observation season, we compare five different pipelines with different working principles. Three pipelines perform component separation at map or spectra level before estimating r from the cleaned spectra, while the other two pipelines performs a global fit for both foreground parameters and r. We also test different methods to account for the effects of time stream filtering systematics. This work shows that our pipelines provide consistent and robust constraints on the tensor-to-scalar ratio and a consistent sensitivity σ(r) ∼ 0.02. This showcases the potential of precise B-mode polarization measurement with AliCPT-1. AliCPT will provide a powerful opportunity to detect PGWs, which is complementary with various ground-based CMB experiments in the southern hemisphere.

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Erratum to: Forecasts on CMB lensing observations with AliCPT-1 [Sci. China-Phys. Mech. Astron. 65, 109511 (2022)]

Liu,

Sun,

Han

et al. 2023

Sci. China Phys. Mech. Astron.

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Forecasts on CMB lensing observations with AliCPT-1

Cited by 13 publications

References 49 publications

Forecasts of CMB lensing reconstruction of AliCPT-1 from the foreground cleaned polarization data

Forecasts of CMB lensing reconstruction of AliCPT-1 from the foreground cleaned polarization data

Performance forecasts for the primordial gravitational wave detection pipelines for AliCPT-1

Erratum to: Forecasts on CMB lensing observations with AliCPT-1 [Sci. China-Phys. Mech. Astron. 65, 109511 (2022)]

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