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Survey Strategy Optimization for the Atacama Cosmology TelescopeIn recent years there have been significant improvements in the sensitivity and the angular resolution of the instruments dedicated to the observation of the Cosmic Microwave Background (CMB). ACTPol is the first polarization receiver for the Atacama Cosmology Telescope (ACT) and is observing the CMB sky with arcmin resolution over approximately 2000 square degrees. Its upgrade, Advanced ACTPol (AdvACT), will observe the CMB in five frequency bands and over a larger area of the sky. We describe the optimization and implementation of the ACTPol and AdvACT surveys. The selection of the observed fields is driven mainly by the science goals, that is, small angular scale CMB measurements, B-mode measurements and cross-correlation studies. For the ACTPol survey we have observed patches of the southern galactic sky with low galactic foreground emissions which were also chosen to maximize the overlap with several galaxy surveys to allow unique cross-correlation studies. A wider field in the northern galactic cap ensured significant additional overlap with the BOSS spectroscopic survey. The exact shapes and footprints of the fields were optimized to achieve uniform coverage and to obtain cross-linked maps by observing the fields with different scan directions. We have maximized the efficiency of the survey by implementing a close to 24-hour observing strategy, switching between daytime and nighttime observing plans and minimizing the telescope idle time. We describe the challenges represented by the survey optimization for the significantly wider area observed by AdvACT, which will observe roughly half of the low-foreground sky. The survey strategies described here may prove useful for planning future ground-based CMB surveys, such as the Simons Observatory and CMB Stage IV surveys.
Document ID
20160010536
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
De Bernardis, F. (Cornell Univ. Ithaca, NY, United States)
Stevens, J. R. (Cornell Univ. Ithaca, NY, United States)
Hasselfield, M. (Pennsylvania State Univ. University Park, PA, United States)
Alonso, D. (Oxford Univ. Oxford, United Kingdom)
Bond, J. R. (Toronto Univ. Ontario, Canada)
Calabrese, E. (Oxford Univ. Oxford, United Kingdom)
Choi, S. K. (Princeton Univ. NJ, United States)
Crowley, K. T. (Princeton Univ. NJ, United States)
Devlin, M. (Pennsylvania Univ. Philadelphia, PA, United States)
Wollack, E. J. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
August 23, 2016
Publication Date
July 15, 2016
Publication Information
Publication: Observatory Operations: Strategies, Processes, and Systems VI
Volume: Proceedings of SPIE 9910
Issue: 991014
Subject Category
Astronomy
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN35077
Meeting Information
Observatory Operations: Strategies, Processes, and Systems(Edinburgh)
Funding Number(s)
CONTRACT_GRANT: NSF-1440226
CONTRACT_GRANT: NSF-AST-1454881
CONTRACT_GRANT: NSF-0408698
CONTRACT_GRANT: NNX13AE56G
CONTRACT_GRANT: NSF-AST-1311756
CONTRACT_GRANT: NNX14AB58G
Distribution Limits
Public
Copyright
Other
Keywords
Atacama Cosmology Telescope (ACT)
Cosmic Microwave Background (CMB)
angular resolution