Forecasts on CMB lensing observations with AliCPT-1

查看全文 作　　者：Jinyi [1]Liu;Zeyang [2,3]Sun;Jiakang [1]Han;Julien [5]Carron;Jacques [6]Delabrouille;Siyu [7]Li;Yang [7]Liu;Jing [7]Jin;Shamik [8,9]Ghosh;Bin [10]Yue;Pengjie [2,3,4]Zhang;Chang [8]Feng;Zhi-Qi [12,13]Huang;Hao [11,7]Liu;Yi-Wen [7]Wu;Le [12,13,14]Zhang;Zi-Rui [7]Zhang;Wen [8,9]Zhao;Bin [1]Hu;Hong [7]Li;Xinmin [15,16]Zhang 机构地区：[1]Department of Astronomy,Beijing Normal University,Beijing 100875,China;[2]Department of Astronomy,School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China;[3]Shanghai Key Laboratory for Particle Physics and Cosmology,Shanghai 200240,China;[4]Division of Astronomy and Astrophysics,Tsung-Dao Lee Institute,Shanghai Jiao Tong University,Shanghai 200240,China;[5]D´epartement de Physique Th´eorique et CAP,Universit´e de Gen`eve,Gen`eve CH-1211,Switzerland;[6]CNRS-UCB International Research Laboratory,Centre Pierre Bin´etruy,CPB-IN2P3,Berkeley IRL2007,USA;[7]Key Laboratory of Particle Astrophysics,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;[8]CAS Key Laboratory for Researches in Galaxies and Cosmology,Department of Astronomy,University of Science and Technology of China,Chinese Academy of Sciences,Hefei 230026,China;[9]School of Astronomy and Space Science,University of Science and Technology of China,Hefei 230026,China;[10]National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China;[11]School of Physics and Optoelectronics Engineering,Anhui University,Hefei 230039,China;[12]School of Physics and Astronomy,Sun Yat-sen University,Zhuhai 519082,China;[13]CSST Science Center for the Guangdong-Hong Kong-Macao Greater Bay Area,Zhuhai 519082,China;[14]Peng Cheng Laboratory,Shenzhen 518000,China;[15]Theoretical devision,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;[16]University of Chinese Academy of Sciences,Beijing 100049,China 出　　处：《Science China(Physics,Mechanics & Astronomy)》索引2022年第65卷第10期,共15页 基　　金：supported by the National Key R&D Program of China (Grant Nos. 2020YFC2201603, 2020YFC2201601, and 2020YFC2201600);National Natural Science Foundation of China (Grant No. 11653003);111 Project (Grant No. B20019)。 摘　　要：Ali CPT-1 is the first Chinese cosmic microwave background(CMB) experiment aiming for the high-precision measurement of CMB B-mode polarization. The telescope, currently under deployment in Tibet, will observe in two frequency bands centered at 90 and 150 GHz. We forecast the CMB lensing reconstruction, lensing-galaxy, and lensing-cosmic infrared background(CIB) cross-correlation signal-to-noise ratio(SNR) for Ali CPT-1. We consider two stages with different integrated observation times, namely “4 module*yr”(first stage) and “48 module*yr”(final stage). For lensing reconstruction, we use three different quadratic estimators, namely temperature-only, polarization-only and minimum-variance(MV) estimators, using curved sky geometry. We take into account the impacts of inhomogeneous hit counts and mean-field bias due to incomplete sky coverage.In the first stage, our results show that the 150 GHz channel can measure the lensing signals at 15σ significance with the MV estimator. In the final stage, the measurement significance will increase to 31σ. We also combine the two frequency data in the harmonic domain to optimize the SNR. Our results show that the coadding procedure can significantly reduce the reconstruction bias in the high multiple range. Owning to the high quality of the polarization data in the final stage of Ali CPT-1, the EB estimator will dominate the lensing reconstruction in this stage. We also estimate the SNR of cross-correlations between Ali CPT-1 CMB lensing and other tracers of the large scale structure of the universe. For its cross-correlation with Dark Energy Spectroscopic Instrument(DESI) galaxies/quasars, we report the cross-correlation SNR = 10-20 for the four redshift bins at 0.05 < z < 2.1. In the first stage, the total SNR is approximately 32. In the final stage, the lensing-galaxy cross-correlation can reach SNR = 52. For lensing-CIB cross-correlation, in the first stage, the cross-correlations between Ali CPT-1 lensing and Planck CIB 353, 545 and857 GHz channels are approximately SNR = 18, 19, and 23, respectively. In the final stage, the cross-correlations can reach SNR = 25, 33 and 42. Due to the strong correlations between frequency bands, the total lensing-CIB cross-correlations by combining the three frequencies in Planck CIBs are SNR = 23 and 43 for the Ali CPT-1 first and final stages, respectively. 关 键 词：background radiation COSMIC COSMOLOGY gravitational lenses and luminous ares