Lensing contribution to the 21cm intensity bispectrum

Rahul Kothari; Roy Maartens

doi:10.1088/1361-6382/abf1c1

Lensing contribution to the 21cm intensity bispectrum

Rahul Kothari, Roy Maartens

Institute of Cosmology & Gravitation

Research output: Contribution to journal › Article › peer-review

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Abstract

Intensity maps of the 21cm emission line of neutral hydrogen are lensed by intervening large-scale structure, similar to the lensing of the cosmic microwave background temperature map. We extend previous work by calculating the lensing contribution to the full-sky 21cm bispectrum in redshift space. The lensing contribution tends to peak when equal-redshift fluctuations are lensed by a lower redshift fluctuation. At high redshift, lensing effects can become comparable to the contributions from density and redshift-space distortions.

Original language	English
Article number	095013
Pages (from-to)	1-12
Number of pages	12
Journal	Classical and Quantum Gravity
Volume	38
Issue number	9
DOIs	https://doi.org/10.1088/1361-6382/abf1c1
Publication status	Published - 14 Apr 2021

Keywords

astro-ph.CO
gr-qc
UKRI
STFC
ST/S000550/1

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10.1088/1361-6382/abf1c1

Kothari_&_Maartens_2021_AAM
This Accepted Manuscript is available for reuse under a CC BY-NC-ND licence after the 12 month embargo period provided that all the terms and conditions of the licence are adhered to.
Accepted author manuscript (Post-print), 964 KBLicence: CC BY-NC-ND

Data availability statement for 'Lensing contribution to the 21cm intensity bispectrum'.
Kothari, R. (Creator) & Maartens, R. (Creator), IOP Publishing, 22 Mar 2021
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AU - Maartens, Roy

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Y1 - 2021/4/14

N2 - Intensity maps of the 21cm emission line of neutral hydrogen are lensed by intervening large-scale structure, similar to the lensing of the cosmic microwave background temperature map. We extend previous work by calculating the lensing contribution to the full-sky 21cm bispectrum in redshift space. The lensing contribution tends to peak when equal-redshift fluctuations are lensed by a lower redshift fluctuation. At high redshift, lensing effects can become comparable to the contributions from density and redshift-space distortions.

AB - Intensity maps of the 21cm emission line of neutral hydrogen are lensed by intervening large-scale structure, similar to the lensing of the cosmic microwave background temperature map. We extend previous work by calculating the lensing contribution to the full-sky 21cm bispectrum in redshift space. The lensing contribution tends to peak when equal-redshift fluctuations are lensed by a lower redshift fluctuation. At high redshift, lensing effects can become comparable to the contributions from density and redshift-space distortions.

KW - astro-ph.CO

KW - gr-qc

KW - UKRI

KW - STFC

KW - ST/S000550/1

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JO - Classical and Quantum Gravity

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ER -

Lensing contribution to the 21cm intensity bispectrum

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Data availability statement for 'Lensing contribution to the 21cm intensity bispectrum'.

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