Dr Ryan Cooke ryan.j.cooke@durham.ac.uk
Associate Professor
The ACCELERATION programme: I. Cosmology with the redshift drift★
Cooke, Ryan
Authors
Abstract
Detecting the change of a cosmological object’s redshift due to the time evolution of the Universal expansion rate is an ambitious experiment that will be attempted with future telescope facilities. In this paper, we describe the ACCELERATION programme, which aims to study the properties of the most underdense regions of the Universe. One of the highlight goals of this programme is to prepare for the redshift drift measurement. Using the EAGLE cosmological hydrodynamic simulations, we estimate the peculiar acceleration of gas in galaxies and in the Lyα forest. We find that star-forming ‘cold neutral gas’ exhibits large peculiar acceleration due to the high local density of baryons near star-forming regions. We conclude that absorption by cold neutral gas is unlikely to yield a detection of the cosmological redshift drift. On the other hand, we find that the peculiar accelerations of Lyα forest absorbers are more than an order of magnitude below the expected cosmological signal. We also highlight that the numerous low H I column density systems display lower peculiar acceleration. Finally, we propose a new ‘Lyα cell’ technique that applies a small correction to the wavelength calibration to secure a relative measurement of the cosmic drift between two unrelated cosmological sources at different redshifts. For suitable combinations of absorption lines, the cosmological signal can be more than doubled, while the affect of the observer peculiar acceleration is mitigated. Using current data of four suitable Lyα cells, we infer a limit on the cosmological redshift drift to be v˙obs<65 m s−1 year−1 (2σ).
Citation
Cooke, R. (2020). The ACCELERATION programme: I. Cosmology with the redshift drift★. Monthly Notices of the Royal Astronomical Society, 492(2), 2044-2057. https://doi.org/10.1093/mnras/stz3465
Journal Article Type | Article |
---|---|
Acceptance Date | Dec 6, 2019 |
Online Publication Date | Dec 10, 2019 |
Publication Date | Feb 29, 2020 |
Deposit Date | Dec 13, 2019 |
Publicly Available Date | Dec 13, 2019 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 492 |
Issue | 2 |
Pages | 2044-2057 |
DOI | https://doi.org/10.1093/mnras/stz3465 |
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Copyright Statement
This article has been accepted for publication in the Monthly notices of the Royal Astronomical Society ©: 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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