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Title: THE MURCHISON WIDEFIELD ARRAY 21 cm POWER SPECTRUM ANALYSIS METHODOLOGY

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.

Authors:
; ;  [1]; ; ; ;  [2]; ; ; ;  [3]; ; ; ;  [4];  [5];  [6]; ;  [7];  [8] more »; « less
  1. Arizona State University, School of Earth and Space Exploration, Tempe, AZ 85287 (United States)
  2. University of Washington, Department of Physics, Seattle, WA 98195 (United States)
  3. ARC Centre of Excellence for All-sky Astrophysics (CAASTRO) (Australia)
  4. MIT Kavli Institute for Astrophysics and Space Research, Cambridge, MA 02139 (United States)
  5. Brown University, Department of Physics, Providence, RI 02912 (United States)
  6. Department of Physics and Electronics, Rhodes University, Grahamstown 6140 (South Africa)
  7. MIT Haystack Observatory, Westford, MA 01886 (United States)
  8. International Centre for Radio Astronomy Research, Curtin University, Perth, WA 6845 (Australia)
Publication Date:
OSTI Identifier:
22666096
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 825; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCURACY; CALIBRATION; COMPARATIVE EVALUATIONS; DATA ANALYSIS; HYDROGEN; RED SHIFT; REDUCTION; SPACE; SPECTRA; STARS; VELOCITY

Citation Formats

Jacobs, Daniel C., Beardsley, A. P., Bowman, Judd D., Hazelton, B. J., Sullivan, I. S., Barry, N., Carroll, P., Trott, C. M., Pindor, B., Briggs, F., Gaensler, B. M., Dillon, Joshua S., Oliveira-Costa, A. de, Ewall-Wice, A., Feng, L., Pober, J. C., Bernardi, G., Cappallo, R. J., Corey, B. E., Emrich, D., E-mail: daniel.c.jacobs@asu.edu, and and others. THE MURCHISON WIDEFIELD ARRAY 21 cm POWER SPECTRUM ANALYSIS METHODOLOGY. United States: N. p., 2016. Web. doi:10.3847/0004-637X/825/2/114.
Jacobs, Daniel C., Beardsley, A. P., Bowman, Judd D., Hazelton, B. J., Sullivan, I. S., Barry, N., Carroll, P., Trott, C. M., Pindor, B., Briggs, F., Gaensler, B. M., Dillon, Joshua S., Oliveira-Costa, A. de, Ewall-Wice, A., Feng, L., Pober, J. C., Bernardi, G., Cappallo, R. J., Corey, B. E., Emrich, D., E-mail: daniel.c.jacobs@asu.edu, & and others. THE MURCHISON WIDEFIELD ARRAY 21 cm POWER SPECTRUM ANALYSIS METHODOLOGY. United States. doi:10.3847/0004-637X/825/2/114.
Jacobs, Daniel C., Beardsley, A. P., Bowman, Judd D., Hazelton, B. J., Sullivan, I. S., Barry, N., Carroll, P., Trott, C. M., Pindor, B., Briggs, F., Gaensler, B. M., Dillon, Joshua S., Oliveira-Costa, A. de, Ewall-Wice, A., Feng, L., Pober, J. C., Bernardi, G., Cappallo, R. J., Corey, B. E., Emrich, D., E-mail: daniel.c.jacobs@asu.edu, and and others. Sun . "THE MURCHISON WIDEFIELD ARRAY 21 cm POWER SPECTRUM ANALYSIS METHODOLOGY". United States. doi:10.3847/0004-637X/825/2/114.
@article{osti_22666096,
title = {THE MURCHISON WIDEFIELD ARRAY 21 cm POWER SPECTRUM ANALYSIS METHODOLOGY},
author = {Jacobs, Daniel C. and Beardsley, A. P. and Bowman, Judd D. and Hazelton, B. J. and Sullivan, I. S. and Barry, N. and Carroll, P. and Trott, C. M. and Pindor, B. and Briggs, F. and Gaensler, B. M. and Dillon, Joshua S. and Oliveira-Costa, A. de and Ewall-Wice, A. and Feng, L. and Pober, J. C. and Bernardi, G. and Cappallo, R. J. and Corey, B. E. and Emrich, D., E-mail: daniel.c.jacobs@asu.edu and and others},
abstractNote = {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.},
doi = {10.3847/0004-637X/825/2/114},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 825,
place = {United States},
year = {2016},
month = {7}
}