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The Atacama Cosmology Telescope: calibration with the Wilkinson Microwave Anisotropy Probe using cross-correlations

Hajian, Amir, Acquaviva, Viviana, Ade, Peter A. R., Aguirre, Paula, Amiri, Mandana, Appel, John William, Barrientos, L. Felipe, Battistelli, Elia S., Bond, John R., Brown, Ben, Burger, Bryce, Chervenak, Jay, Das, Sudeep, Devlin, Mark J., Dicker, Simon R., Doriese, W. Bertrand, Dunkley, Joanna, Dünner, Rolando, Essinger-Hileman, Thomas, Fisher, Ryan P., Fowler, Joseph W., Halpern, Mark, Hasselfield, Matthew, Hernández-Monteagudo, Carlos, Hilton, Gene C., Hilton, Matt, Hincks, Adam D., Hlozek, Renée, Huffenberger, Kevin M., Hughes, David H., Hughes, John P., Infante, Leopoldo, Irwin, Kent D., Juin, Jean Baptiste, Kaul, Madhuri, Klein, Jeff, Kosowsky, Arthur, Lau, Judy M., Limon, Michele, Lin, Yen-Ting, Lupton, Robert H., Marriage, Tobias A., Marsden, Danica, Mauskopf, Philip Daniel, Menanteau, Felipe, Moodley, Kavilan, Moseley, Harvey, Netterfield, Calvin B., Niemack, Michael D., Nolta, Michael R., Page, Lyman A., Parker, Lucas, Partridge, Bruce, Reid, Beth, Sehgal, Neelima, Sherwin, Blake D., Sievers, Jon, Spergel, David N., Staggs, Suzanne T., Swetz, Daniel S., Switzer, Eric R., Thornton, Robert, Trac, Hy, Tucker, Carole Elizabeth, Warne, Ryan, Wollack, Ed and Zhao, Yue 2011. The Atacama Cosmology Telescope: calibration with the Wilkinson Microwave Anisotropy Probe using cross-correlations. Astrophysical Journal 740 (2) , 86. 10.1088/0004-637X/740/2/86

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We present a new calibration method based on cross-correlations with the Wilkinson Microwave Anisotropy Probe (WMAP) and apply it to data from the Atacama Cosmology Telescope (ACT). ACT's observing strategy and map-making procedure allows an unbiased reconstruction of the modes in the maps over a wide range of multipoles. By directly matching the ACT maps to WMAP observations in the multipole range of 400 < l < 1000, we determine the absolute calibration with an uncertainty of 2% in temperature. The precise measurement of the calibration error directly impacts the uncertainties in the cosmological parameters estimated from the ACT power spectra. We also present a combined map based on ACT and WMAP data that has a high signal-to-noise ratio over a wide range of multipoles.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: cosmic background radiation; cosmology: observations; methods: data analysis; methods: statistical
Publisher: Institute of Physics
ISSN: 0004-637X
Last Modified: 23 Jan 2020 03:50

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