Overcoming real-world obstacles in 21 cm power spectrum estimation: A method demonstration and results from early Murchison Widefield Array data
dc.contributor.author | Dillon, J. | |
dc.contributor.author | Liu, A. | |
dc.contributor.author | Williams, C. | |
dc.contributor.author | Hewit, J. | |
dc.contributor.author | Tegmark, M. | |
dc.contributor.author | Morgan, E. | |
dc.contributor.author | Levine, A. | |
dc.contributor.author | Morales, M. | |
dc.contributor.author | Tingay, Steven | |
dc.contributor.author | BERNARDI, G. | |
dc.contributor.author | Bowman, J. | |
dc.contributor.author | Briggs, F. | |
dc.contributor.author | Cappallo, R. | |
dc.contributor.author | Emrich, David | |
dc.contributor.author | Mitchell, D. | |
dc.contributor.author | Oberoi, D. | |
dc.contributor.author | Prabu, T. | |
dc.contributor.author | Wayth, Randall | |
dc.contributor.author | Webster, R. | |
dc.date.accessioned | 2017-01-30T12:37:42Z | |
dc.date.available | 2017-01-30T12:37:42Z | |
dc.date.created | 2016-09-22T12:29:03Z | |
dc.date.issued | 2014 | |
dc.identifier.citation | Dillon, J. and Liu, A. and Williams, C. and Hewit, J. and Tegmark, M. and Morgan, E. and Levine, A. et al. 2014. Overcoming real-world obstacles in 21 cm power spectrum estimation: A method demonstration and results from early Murchison Widefield Array data. Physical Review D. 89 (2). | |
dc.identifier.uri | http://hdl.handle.net/20.500.11937/23524 | |
dc.identifier.doi | 10.1103/PhysRevD.89.023002 | |
dc.description.abstract |
We present techniques for bridging the gap between idealized inverse covariance weighted quadratic estimation of 21 cm power spectra and the real-world challenges presented universally by interferometric observation. By carefully evaluating various estimators and adapting our techniques for large but incomplete data sets, we develop a robust power spectrum estimation framework that preserves the so-called "Epoch of Reionization (EoR) window" and keeps track of estimator errors and covariances. We apply our method to observations from the 32-tile prototype of the Murchinson Widefield Array to demonstrate the importance of a judicious analysis technique. Lastly, we apply our method to investigate the dependence of the clean EoR window on frequency—especially the frequency dependence of the so-called “wedge" feature—and establish upper limits on the power spectrum from z ¼ 6.2 to z ¼ 11:7. Our lowest limit is ?ðkÞ < 0.3 Kelvin at 95% confidence at a comoving scale k ¼ 0.046 Mpc-1 and z ¼ 9.5. | |
dc.publisher | American Physical Society | |
dc.title | Overcoming real-world obstacles in 21 cm power spectrum estimation: A method demonstration and results from early Murchison Widefield Array data | |
dc.type | Journal Article | |
dcterms.source.volume | 89 | |
dcterms.source.number | 2 | |
dcterms.source.issn | 1550-2368 | |
dcterms.source.title | Physical Review D | |
curtin.note |
Copyright © 2014 by the American Physical Society | |
curtin.department | Curtin Institute of Radio Astronomy (Physics) | |
curtin.accessStatus | Open access |