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arxiv: 1009.0777 · v1 · submitted 2010-09-03 · 🌌 astro-ph.CO · astro-ph.IM

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The Atacama Cosmology Telescope: Calibration with WMAP Using Cross-Correlations

Amir Hajian , Viviana Acquaviva , Peter A. R. Ade , Paula Aguirre , Mandana Amiri , John William Appel , L. Felipe Barrientos , Elia S. Battistelli
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J. Richard Bond Ben Brown Bryce Burger Jay Chervenak Sudeep Das Mark J. Devlin Simon R. Dicker W. Bertrand Doriese Joanna Dunkley Rolando Dunner Thomas Essinger-Hileman Ryan P. Fisher Joseph W. Fowler Mark Halpern Matthew Hasselfield Carlos Hernandez-Monteagudo Gene C. Hilton Matt Hilton Adam D. Hincks Renee Hlozek Kevin M. Huffenberger David H. Hughes John P. Hughes Leopoldo Infante Kent D. Irwin Jean Baptiste Juin Madhuri Kaul Jeff Klein Arthur Kosowsky Judy M Lau Michele Limon Yen-Ting Lin Robert H. Lupton Tobias A. Marriage Danica Marsden Phil Mauskopf Felipe Menanteau Kavilan Moodley Harvey Moseley Calvin B. Netterfield Michael D. Niemack Michael R. Nolta Lyman A. Page Lucas Parker Bruce Partridge Beth Reid Neelima Sehgal Blake D. Sherwin Jon Sievers David N. Spergel Suzanne T. Staggs Daniel S. Swetz Eric R. Switzer Robert Thornton Hy Trac Carole Tucker Ryan Warne Ed Wollack Yue Zhao
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classification 🌌 astro-ph.CO astro-ph.IM
keywords calibrationwmaprangeatacamacosmologycross-correlationsdatadirectly
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We present a new calibration method based on cross-correlations with 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 < ell < 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 high signal-to-noise over a wide range of multipoles.

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