期刊
ASTROPHYSICAL JOURNAL
卷 740, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/0004-637X/740/2/86
关键词
cosmic background radiation; cosmology: observations; methods: data analysis; methods: statistical
资金
- U.S. National Science Foundation [AST-0408698, PHY-0355328, AST-0707731, PIRE-0507768]
- Princeton University
- University of Pennsylvania
- Canada Foundation for Innovation under the auspices of Compute Canada
- Government of Ontario
- Ontario Research Fund-Research Excellence
- University of Toronto
- NASA [NNX08AH30G]
- Natural Science and Engineering Research Council of Canada (NSERC)
- NSF [AST-0546035, AST-0606975]
- FONDAP Centro de Astrofisica
- CONICYT
- MECESUP
- Fundacion Andes
- NSF Physics Frontier Center [PHY-0114422]
- South African National Research Foundation (NRF)
- Meraka Institute
- South African Square Kilometer Array (SKA) Project
- RCUK
- Berkeley Center for Cosmological Physics
- World Premier International Research Center Initiative, MEXT, Japan
- U.S. Department of Energy [DE-AC3-76SF00515]
- NASA Office of Space Science
- STFC [ST/G002711/1] Funding Source: UKRI
- ICREA Funding Source: Custom
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.
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