@article{646ab2571eab4bdc9bdfd1e441647866,
title = "Constraining the 21 cm brightness temperature of the IGM at z = 6.6 around LAEs with the murchison widefield array",
abstract = "The locations of Ly α-emitting galaxies (LAEs) at the end of the Epoch of Reionization (EoR) are expected to correlate with regions of ionized hydrogen, traced by the redshifted 21 cm hyperfine line. Mapping the neutral hydrogen around regions with detected and localized LAEs offers an avenue to constrain the brightness temperature of the Universe within the EoR by providing an expectation for the spatial distribution of the gas, thereby providing prior information unavailable to power spectrum measurements. We use a test set of 12 h of observations from the Murchison Widefield Array (MWA) in extended array configuration, to constrain the neutral hydrogen signature of 58 LAEs, detected with the Subaru Hypersuprime Cam in the Silverrush survey, centred on z = 6.58. We assume that detectable emitters reside in the centre of ionized H ii bubbles during the end of reionization, and predict the redshifted neutral hydrogen signal corresponding to the remaining neutral regions using a set of different ionized bubble radii. A pre-whitening matched filter detector is introduced to assess detectability. We demonstrate the ability to detect, or place limits upon, the amplitude of brightness temperature fluctuations, and the characteristic H ii bubble size. With our limited data, we constrain the brightness temperature of neutral hydrogen to ΔTB <30 mK (<200 mK) at 95 per cent (99 per cent) confidence for lognormally distributed bubbles of radii, RB = 15 ± 2h-1 cMpc. ",
keywords = "instrumentation: interferometers, methods: statistical",
author = "Trott, {C. M.} and Jordan, {C. H.} and Line, {J. L.B.} and Lynch, {C. R.} and S. Yoshiura and B. Mckinley and P. Dayal and B. Pindor and A. Hutter and K. Takahashi and Wayth, {R. B.} and N. Barry and A. Beardsley and J. Bowman and R. Byrne and A. Chokshi and B. Greig and K. Hasegawa and Hazelton, {B. J.} and E. Howard and D. Jacobs and M. Kolopanis and Mitchell, {D. A.} and Morales, {M. F.} and S. Murray and Pober, {J. C.} and M. Rahimi and Tingay, {S. J.} and Webster, {R. L.} and M. Wilensky and Wyithe, {J. S.B.} and Q. Zheng",
note = "Funding Information: We would like to thank Marcin Sokolowski and Andrew Williams for help with scheduling the observations. This research was partly supported by the Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), through project number CE170100013. CMT is supported by an ARC Future Fellowship under grant FT180100321. The International Centre for Radio Astronomy Research (ICRAR) is a Joint Venture of Curtin University and The University of Western Australia, funded by the Western Australian State government. KT is partially supported by JSPS KAKENHI grants JP15H05896, JP16H05999, and JP17H01110, and Bilateral Joint Research Projects of JSPS. PD and AH acknowledge support from the European Research Council's starting grant ERC StG-717001 (DELPHI). PD acknowledges support from the NWO grant 016.VIDI.189.162 (ODIN) and the European Commission's and University of Groningen's COFUND Rosalind Franklin University program. The MWA Phase II upgrade project was supported by Australian Research Council LIEF grant LE160100031 and the Dunlap Institute for Astronomy and Astrophysics at the University of Toronto. This scientific work uses the Murchison Radio-astronomy Observatory, operated by CSIRO. We acknowledge the Wajarri Yamatji people as the traditional owners of the Observatory site. Support for the operation of the MWA is provided by the Australian Government (NCRIS), under a contract to Curtin University administered by Astronomy Australia Limited. We acknowledge the Pawsey Supercomputing Centre, which is supported by the Western Australian and Australian Governments. Publisher Copyright: {\textcopyright} 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.",
year = "2021",
month = oct,
day = "1",
doi = "10.1093/mnras/stab2235",
language = "English (US)",
volume = "507",
pages = "772--780",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "1",
}