Jacobs, Daniel C. ; Hazelton, B. J. ; Trott, C. M. ; Dillon, Joshua S. ; Pindor, B. ; Sullivan, I. S. ; Pober, J. C. ; Barry, N. ; Beardsley, A. P. ; Bernardi, G. ; Bowman, Judd D. ; Briggs, F. ; Cappallo, R. J. ; Carroll, P. ; Corey, B. E. ; de Oliveira-Costa, A. ; Emrich, D. ; Ewall-Wice, A. ; Feng, L. ; Gaensler, B. M. ; Goeke, R. ; Greenhill, L. J. ; Hewitt, J. N. ; Hurley-Walker, N. ; Johnston-Hollitt, M. ; Kaplan, D. L. ; Kasper, J. C. ; Kim, HS ; Kratzenberg, E. ; Lenc, E. ; Line, J. ; Loeb, A. ; Lonsdale, C. J. ; Lynch, M. J. ; McKinley, B. ; McWhirter, S. R. ; Mitchell, D. A. ; Morales, M. F. ; Morgan, E. ; Neben, A. R. ; Thyagarajan, N. ; Oberoi, D. ; Offringa, A. R. ; Ord, S. M. ; Paul, S. ; Prabu, T. ; Procopio, P. ; Riding, J. ; Rogers, A. E. E. ; Roshi, A. ; Shankar, N. Udaya ; Sethi, Shiv K. ; Srivani, K. S. ; Subrahmanyan, R. ; Tegmark, M. ; Tingay, S. J. ; Waterson, M. ; Wayth, R. B. ; Webster, R. L. ; Whitney, A. R. ; Williams, A. ; Williams, C. L. ; Wu, C. ; Wyithe, J. S. B. (2016) The Murchison Widefield Array 21 cm power spectrum analysis methodology The Astrophysical Journal, 825 (2). Article ID 114-16 pages. ISSN 0004-637X
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Official URL: http://iopscience.iop.org/article/10.3847/0004-637...
Related URL: http://dx.doi.org/10.3847/0004-637X/825/2/114
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.
| Item Type: | Article |
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| Source: | Copyright of this article belongs to American Astronomical Society. |
| Keywords: | Dark Ages; Reionization; First Stars; Methods: Data Analysis; Techniques: Interferometric |
| ID Code: | 114212 |
| Deposited On: | 21 May 2018 06:32 |
| Last Modified: | 21 May 2018 06:32 |
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