One of the most important checks for systematic errors in CMB studies is the cross correlation of maps made by independent experiments. In this paper we report on the cross correlation between maps from the Atacama B-mode Search (ABS) and Atacama Cosmology Telescope (ACT) experiments in both temperature and polarization. These completely different measurements have a clear correlation with each other and with the Planck satellite in both the EE and TE spectra at ℓ<400 over the roughly 1100 deg2 common to all three. The TB, EB, and BB cross spectra are consistent with noise. Exploiting such cross-correlations will be important for future experiments operating in Chile that aim to probe the 30<ℓ<8,000 range.
@article{arxiv.2002.05717,
title = {The cross correlation of the ABS and ACT maps},
author = {Zack Li and Sigurd Naess and Simone Aiola and David Alonso and John W. Appel and J. Richard Bond and Erminia Calabrese and Steve K. Choi and Kevin T. Crowley and Thomas Essinger-Hileman and Shannon M. Duff and Joanna Dunkley and J. W. Fowler and Patricio Gallardo and Shuay-Pwu Patty Ho and Johannes Hubmayr and Akito Kusaka and Thibaut Louis and Mathew S. Madhavacheril and Jeffrey McMahon and Federico Nati and Michael D. Niemack and Lyman Page and Lucas Parker and Bruce Partridge and Maria Salatino and Jonathan L. Sievers and Cristóbal Sifón and Sara M. Simon and Suzanne T. Staggs and Emilie Storer and Edward J. Wollack},
journal= {arXiv preprint arXiv:2002.05717},
year = {2021}
}
Comments
7 pages, 5 figures. For an interactive demonstration of the methods, see https://colab.research.google.com/drive/1CnMGLn-J3pySv8A9ffNWDSlXlJWMrp2W