Title:	The Murchison Widefield Array 21 cm power spectrum analysis methodology
Authors:	Jacobs, Daniel C Hazelton, B.J. Udaya Shankar, N. Prabu, T. Sethi, S.K. Srivani, K.S. Subrahmanyan, Ravi +60 Co-authors
Keywords:	dark ages reionization interferometric
Issue Date:	10-Jul-2016
Publisher:	IOP Sciences for The American Astronomical Society
Citation:	Astrophysical Journal, 2016, Vol. 825, p 114
Abstract:	We present the 21 cm power spectrum analysis approach of the Murchison Widefield Array Epoch of Reionization project. In this paper, we compare the outputs of multiple pipelines for the purpose of validating statistical limits cosmological hydrogen at redshifts between 6 and 12. Multiple independent data calibration and reduction pipelines are used to make power spectrum limits on a fiducial night of data. Comparing the outputs of imaging and power spectrum stages highlights differences in calibration, foreground subtraction, and power spectrum calculation. The power spectra found using these different methods span a space defined by the various tradeoffs between speed, accuracy, and systematic control. Lessons learned from comparing the pipelines range from the algorithmic to the prosaically mundane; all demonstrate the many pitfalls of neglecting reproducibility. We briefly discuss the way these different methods attempt to handle the question of evaluating a significant detection in the presence of foregrounds.
Description:	Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
URI:	http://hdl.handle.net/2289/6618
ISSN:	0004-637X 1538-4357-(Online)
Alternative Location:	http://adsabs.harvard.edu/abs/2016ApJ...825..114J http://arxiv.org/abs/1605.06978 http://dx.doi.org/10.3847/0004-637X/825/2/114
Copyright:	2016, The American Astronomical Society.
Appears in Collections:	Research Papers (A&A)

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