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Observing the reionization epoch through 21-centimetre radiation

Furlanetto, Steven R. and Sokasian, Aaron and Hernquist, Lars (2004) Observing the reionization epoch through 21-centimetre radiation. Monthly Notices of the Royal Astronomical Society, 347 (1). pp. 187-195. ISSN 0035-8711. doi:10.1111/j.1365-2966.2004.07187.x.

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We study the observability of the reionization epoch through the 21-cm hyperfine transition of neutral hydrogen. We use a high-resolution cosmological simulation (including hydrodynamics) together with a fast radiative transfer algorithm to compute the evolution of 21-cm emission from the intergalactic medium (IGM) in several different models of reionization. We show that the mean brightness temperature of the IGM drops from δT_b∼ 25 mK to ∼10−² mK during overlap (over a frequency interval Δν ∼ 25 MHz), while the root mean square fluctuations on small scales drop abruptly from 〈δT²_b〉¹/² ∼ 10 mK to ∼ 10⁻¹ mK at the end of overlap. We show that 21-cm observations can efficiently discriminate models with a single early reionization epoch from models with two distinct reionization episodes.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Furlanetto, Steven R.0000-0002-0658-1243
Hernquist, Lars0000-0001-6950-1629
Additional Information:© 2004 RAS, MNRAS. Received: 11 July 2003. Accepted: 08 September 2003. Published: 01 January 2004. We would like to thank V. Springel for providing the cosmological simulations upon which this paper is based and for useful comments on the manuscript. We also thank I. Iliev for helpful discussions about equation (7) and B. Robertson for managing the computer system on which these calculations were performed. This work was supported in part by NSF grant AST 00-71019. The simulations were performed at the Center for Parallel Astrophysical Computing at the Harvard-Smithsonian Center for Astrophysics.
Funding AgencyGrant Number
NSFAST 00-71019
Subject Keywords:intergalactic medium, cosmology: theory, diffuse radiation
Issue or Number:1
Record Number:CaltechAUTHORS:20210116-163807998
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Official Citation:Steven R. Furlanetto, Aaron Sokasian, Lars Hernquist, Observing the reionization epoch through 21-centimetre radiation, Monthly Notices of the Royal Astronomical Society, Volume 347, Issue 1, January 2004, Pages 187–195,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:107529
Deposited By: Rebecca Minjarez
Deposited On:21 Jan 2021 17:29
Last Modified:16 Nov 2021 19:04

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