The cross correlation of the ABS and ACT maps
Authors: Zack Li, Sigurd Naess, Simone Aiola, David Alonso, John W. Appel, J. Richard Bond, Erminia Calabrese, Steve K. Choi, Kevin T. Crowley, Thomas Essinger-Hileman, Shannon M. Duff, Joanna Dunkley, J. W. Fowler, Patricio Gallardo, Shuay-Pwu Patty Ho, Johannes Hubmayr, Akito Kusaka, Thibaut Louis, Mathew S. Madhavacheril, Jeffrey McMahon, Federico Nati, Michael D. Niemack, Lyman Page, Lucas Parker, Bruce Partridge, Maria Salatino, Jonathan L. Sievers, Cristóbal Sifón, Sara M. Simon, Suzanne T. Staggs, Emilie Storer, Edward J. Wollack
Abstract: 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 $\ell<400$ over the roughly $1100$ deg$^2$ 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 $30<\ell<8,000$ range.
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