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.
@article{arxiv.1009.0777,
title = {The Atacama Cosmology Telescope: Calibration with WMAP Using Cross-Correlations},
author = {Amir Hajian and Viviana Acquaviva and Peter A. R. Ade and Paula Aguirre and Mandana Amiri and John William Appel and L. Felipe Barrientos and Elia S. Battistelli and J. Richard Bond and Ben Brown and Bryce Burger and Jay Chervenak and Sudeep Das and Mark J. Devlin and Simon R. Dicker and W. Bertrand Doriese and Joanna Dunkley and Rolando Dunner and Thomas Essinger-Hileman and Ryan P. Fisher and Joseph W. Fowler and Mark Halpern and Matthew Hasselfield and Carlos Hernandez-Monteagudo and Gene C. Hilton and Matt Hilton and Adam D. Hincks and Renee Hlozek and Kevin M. Huffenberger and David H. Hughes and John P. Hughes and Leopoldo Infante and Kent D. Irwin and Jean Baptiste Juin and Madhuri Kaul and Jeff Klein and Arthur Kosowsky and Judy M Lau and Michele Limon and Yen-Ting Lin and Robert H. Lupton and Tobias A. Marriage and Danica Marsden and Phil Mauskopf and Felipe Menanteau and Kavilan Moodley and Harvey Moseley and Calvin B. Netterfield and Michael D. Niemack and Michael R. Nolta and Lyman A. Page and Lucas Parker and Bruce Partridge and Beth Reid and Neelima Sehgal and Blake D. Sherwin and Jon Sievers and David N. Spergel and Suzanne T. Staggs and Daniel S. Swetz and Eric R. Switzer and Robert Thornton and Hy Trac and Carole Tucker and Ryan Warne and Ed Wollack and Yue Zhao},
journal= {arXiv preprint arXiv:1009.0777},
year = {2012}
}
Comments
Submitted to ApJ. This is a companion to Das et al (2010) and Dunkley et al (2010)