Forecasts on CMB lensing observations with AliCPT-1

AliCPT-1 is the first Chinese cosmic microwave background (CMB) experiment aiming for high-precision measurement of CMB B-mode polarization. The telescope, currently under deployment in Tibet, will observe two frequency bands centered at 90 and 150 GHz. We forecast lensing reconstruction, lensing-galaxy, lensing-cosmic infrared (CIB) cross-correlation signal-to-noise ratio (SNR) AliCPT-1. consider stages with different integrated observation times, namely “4 module*yr” (first stage) “48 (final stage). For we use three quadratic estimators, temperature-only, polarization-only minimum-variance (MV) using curved sky geometry. take into account impacts inhomogeneous hit counts mean-field bias due to incomplete coverage. In stage, our results show that GHz channel can measure signals 15cr significance MV estimator. final increase 31σ. also combine data harmonic domain optimize SNR. Our coadding procedure significantly reduce reconstruction high multiple range. Owning quality polarization stage AliCPT-1, EB estimator dominate this stage. estimate SNR cross-correlations between other tracers large scale structure universe. its Dark Energy Spectroscopic Instrument (DESI) galaxies/quasars, report = 10–20 four redshift bins 0.05 < z 2.1. total approximately 32. lensing-galaxy reach 52. lensing-CTB cross-correlation, Planck CIB 353, 545 857 channels are =18,19, 23, respectively. 25,33 42. Due strong correlations bands, lensing-CIB by combining frequencies CIBs 23 43 stages,