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http://hdl.handle.net/2289/5869
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DC Field | Value | Language |
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dc.contributor.author | Dillon, Joshua S. | - |
dc.contributor.author | Liu, Adrian | - |
dc.contributor.author | Prabu, T. | - |
dc.contributor.author | +16 Co-authors | - |
dc.date.accessioned | 2014-04-24T11:30:21Z | - |
dc.date.available | 2014-04-24T11:30:21Z | - |
dc.date.issued | 2014-01 | - |
dc.identifier.citation | Physical Review D, 2014, Vol.89, p23002 | en |
dc.identifier.issn | 1550-7998 | - |
dc.identifier.issn | 1550-2368(Online) | - |
dc.identifier.uri | http://hdl.handle.net/2289/5869 | - |
dc.description | Open Access | en |
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=6.2 to z=11.7. Our lowest limit is Δ(k)<0.3 Kelvin at 95% confidence at a comoving scale k=0.046 Mpc−1 and z=9.5. | en |
dc.language.iso | en | en |
dc.publisher | American Physical Society | en |
dc.relation.uri | http://adsabs.harvard.edu/abs/2014PhRvD..89b3002D | en |
dc.relation.uri | http://arxiv.org/abs/1304.4229 | en |
dc.relation.uri | http://dx.doi.org/10.1103/PhysRevD.89.023002 | en |
dc.rights | 2014 American Physical Society | en |
dc.title | Overcoming real-world obstacles in 21 cm power spectrum estimation: A method demonstration and results from early Murchison Widefield Array data | en |
dc.type | Article | en |
Appears in Collections: | Research Papers (A&A) |
Files in This Item:
File | Description | Size | Format | |
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2014_PhysRevD_89_023002.pdf | Open Access | 2.45 MB | Adobe PDF | View/Open |
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