Gluscevic, Vera and Barkana, Rennan (2010) Statistics of 21-cm fluctuations in cosmic reionization simulations: PDFs and difference PDFs. Monthly Notices of the Royal Astronomical Society, 408 (4). pp. 2373-2380. ISSN 0035-8711 http://resolver.caltech.edu/CaltechAUTHORS:20101221-150448611
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In the coming decade, low-frequency radio arrays will begin to probe the epoch of reionization via the redshifted 21-cm hydrogen line. Successful interpretation of these observations will require effective statistical techniques for analysing the data. Due to the difficulty of these measurements, it is important to develop techniques beyond the standard power-spectrum analysis in order to offer independent confirmation of the reionization history, probe different aspects of the topology of reionization and have different systematic errors. In order to assess the promise of probability distribution functions (PDFs) as statistical analysis tools in 21-cm cosmology, we first measure the 21-cm brightness temperature (one-point) PDFs in six different reionization simulations. We then parametrize their most distinct features by fitting them to a simple model. Using the same simulations, we also present the first measurements of difference PDFs in simulations of reionization. We find that while these statistics probe the properties of the ionizing sources, they are relatively independent of small-scale, subgrid astrophysics. We discuss the additional information that the difference PDF can provide on top of the power spectrum and the one-point PDF.
|Additional Information:||© 2010 The Authors. Journal compilation © 2010 RAS. Accepted 2010 July 1. Received 2010 July 1; in original form 2010 May 20. Article first published online: 27 Aug. 2010. We thank Matthew McQuinn for useful comments, and we are grateful for the hospitality of the Aspen Center for Physics, where part of this work was completed. This work was supported (for VG) by DoE DE-FG03-92-ER40701, NASA NNX10AD04G and the Gordon and Betty Moore Foundation, and (for RB) by the Moore Distinguished Scholar Programme at Caltech, the John Simon Guggenheim Memorial Foundation and Israel Science Foundation grant 823/09.|
|Subject Keywords:||galaxies: high-redshift; cosmology: theory; galaxies: formation|
|Official Citation:||Gluscevic, V. and Barkana, R. (2010), Statistics of 21-cm fluctuations in cosmic reionization simulations: PDFs and difference PDFs. Monthly Notices of the Royal Astronomical Society, 408: 2373–2380. doi: 10.1111/j.1365-2966.2010.17293.x|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||12 Jan 2011 19:10|
|Last Modified:||26 Dec 2012 12:47|
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