Effects of the sources of reionization on 21-cm redshift-space distortions

Suman Majumdar; Hannes Jensen; Garrelt Mellema; Emma Chapman; Filipe B. Abdalla; Kai Yan Lee; Ilian T. Iliev; Keri L. Dixon; Kanan K. Datta; Benedetta Ciardi; Elizabeth R. Fernandez; Vibor Jelić; Léon V.E. Koopmans; Saleem Zaroubi

doi:10.1093/mnras/stv2812

Effects of the sources of reionization on 21-cm redshift-space distortions

Suman Majumdar, Hannes Jensen, Garrelt Mellema, Emma Chapman, Filipe B. Abdalla, Kai Yan Lee, Ilian T. Iliev, Keri L. Dixon, Kanan K. Datta, Benedetta Ciardi, Elizabeth R. Fernandez, Vibor Jelić, Léon V.E. Koopmans, Saleem Zaroubi

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Abstract

The observed 21 cm signal from the epoch of reionization will be distorted along the line of sight by the peculiar velocities of matter particles. These redshift-space distortions will affect the contrast in the signal and will also make it anisotropic. This anisotropy contains information about the cross-correlation between the matter density field and the neutral hydrogen field, and could thus potentially be used to extract information about the sources of reionization. In this paper, we study a collection of simulated reionization scenarios assuming different models for the sources of reionization. We show that the 21 cm anisotropy is best measured by the quadrupole moment of the power spectrum. We find that, unless the properties of the reionization sources are extreme in some way, the quadrupole moment evolves very predictably as a function of global neutral fraction. This predictability implies that redshiftspace distortions are not a very sensitive tool for distinguishing between reionization sources. However, the quadrupole moment can be used as a model-independent probe for constraining the reionization history. We show that such measurements can be done to some extent by first-generation instruments such as LOFAR, while the SKA should be able to measure the reionization history using the quadrupole moment of the power spectrum to great accuracy.

Original language	English
Pages (from-to)	2080-2094
Number of pages	15
Journal	Monthly Notices of the Royal Astronomical Society
Volume	456
Issue number	2
DOIs	https://doi.org/10.1093/mnras/stv2812
State	Published - 2016
Externally published	Yes

Bibliographical note

Funding Information:
SM would like to thank Raghunath Ghara for useful discussions related to the effect of spin temperature fluctuations on the EoR 21 cm signal. The research described in this paper was supported by a grant from the Lennart and Alva Dahlmark Fund. GM is supported by Swedish Research Council project grant 2012-4144. The PRACE4LOFAR simulations were performed on the Curie system at TGCC under PRACE projects 2012061089 and 2014102339. This work was supported by the Science and Technology Facilities Council (grant no. ST/L000652/1). KKD would like to thank DST for support through the project SR/FTP/PS-119/2012 and the University Grant Commission (UGC), India for support through UGC-faculty recharge scheme (UGC-FRP) vide ref. no. F.4-5(137- FRP)/2014(BSR). VJ would like to thank the Netherlands Foundation for Scientific Research (NWO) for financial support through VENI grant 639.041.336. LVEK acknowledges the financial support from the European Research Council under ERC-StartingGrant FIRSTLIGHT - 258942.

Publisher Copyright:
© 2015 The Authors. Published by Oxford University Press.

Keywords

Dark ages, reionization, first stars
Methods: numerical

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10.1093/mnras/stv2812

Cite this

Majumdar, S., Jensen, H., Mellema, G., Chapman, E., Abdalla, F. B., Lee, K. Y., Iliev, I. T., Dixon, K. L., Datta, K. K., Ciardi, B., Fernandez, E. R., Jelić, V., Koopmans, L. V. E., & Zaroubi, S. (2016). Effects of the sources of reionization on 21-cm redshift-space distortions. Monthly Notices of the Royal Astronomical Society, 456(2), 2080-2094. https://doi.org/10.1093/mnras/stv2812

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abstract = "The observed 21 cm signal from the epoch of reionization will be distorted along the line of sight by the peculiar velocities of matter particles. These redshift-space distortions will affect the contrast in the signal and will also make it anisotropic. This anisotropy contains information about the cross-correlation between the matter density field and the neutral hydrogen field, and could thus potentially be used to extract information about the sources of reionization. In this paper, we study a collection of simulated reionization scenarios assuming different models for the sources of reionization. We show that the 21 cm anisotropy is best measured by the quadrupole moment of the power spectrum. We find that, unless the properties of the reionization sources are extreme in some way, the quadrupole moment evolves very predictably as a function of global neutral fraction. This predictability implies that redshiftspace distortions are not a very sensitive tool for distinguishing between reionization sources. However, the quadrupole moment can be used as a model-independent probe for constraining the reionization history. We show that such measurements can be done to some extent by first-generation instruments such as LOFAR, while the SKA should be able to measure the reionization history using the quadrupole moment of the power spectrum to great accuracy.",

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author = "Suman Majumdar and Hannes Jensen and Garrelt Mellema and Emma Chapman and Abdalla, {Filipe B.} and Lee, {Kai Yan} and Iliev, {Ilian T.} and Dixon, {Keri L.} and Datta, {Kanan K.} and Benedetta Ciardi and Fernandez, {Elizabeth R.} and Vibor Jeli{\'c} and Koopmans, {L{\'e}on V.E.} and Saleem Zaroubi",

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year = "2016",

doi = "10.1093/mnras/stv2812",

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Majumdar, S, Jensen, H, Mellema, G, Chapman, E, Abdalla, FB, Lee, KY, Iliev, IT, Dixon, KL, Datta, KK, Ciardi, B, Fernandez, ER, Jelić, V, Koopmans, LVE & Zaroubi, S 2016, 'Effects of the sources of reionization on 21-cm redshift-space distortions', Monthly Notices of the Royal Astronomical Society, vol. 456, no. 2, pp. 2080-2094. https://doi.org/10.1093/mnras/stv2812

TY - JOUR

T1 - Effects of the sources of reionization on 21-cm redshift-space distortions

AU - Majumdar, Suman

AU - Jensen, Hannes

AU - Mellema, Garrelt

AU - Chapman, Emma

AU - Abdalla, Filipe B.

AU - Lee, Kai Yan

AU - Iliev, Ilian T.

AU - Dixon, Keri L.

AU - Datta, Kanan K.

AU - Ciardi, Benedetta

AU - Fernandez, Elizabeth R.

AU - Jelić, Vibor

AU - Koopmans, Léon V.E.

AU - Zaroubi, Saleem

PY - 2016

Y1 - 2016

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AB - The observed 21 cm signal from the epoch of reionization will be distorted along the line of sight by the peculiar velocities of matter particles. These redshift-space distortions will affect the contrast in the signal and will also make it anisotropic. This anisotropy contains information about the cross-correlation between the matter density field and the neutral hydrogen field, and could thus potentially be used to extract information about the sources of reionization. In this paper, we study a collection of simulated reionization scenarios assuming different models for the sources of reionization. We show that the 21 cm anisotropy is best measured by the quadrupole moment of the power spectrum. We find that, unless the properties of the reionization sources are extreme in some way, the quadrupole moment evolves very predictably as a function of global neutral fraction. This predictability implies that redshiftspace distortions are not a very sensitive tool for distinguishing between reionization sources. However, the quadrupole moment can be used as a model-independent probe for constraining the reionization history. We show that such measurements can be done to some extent by first-generation instruments such as LOFAR, while the SKA should be able to measure the reionization history using the quadrupole moment of the power spectrum to great accuracy.

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KW - Methods: numerical

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Effects of the sources of reionization on 21-cm redshift-space distortions

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Bibliographical note

Keywords

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