David Harvey
Reconciling galaxy cluster shapes, measured by theorists vs observers
Harvey, David; Robertson, Andrew; Tam, Sut-Ieng; Jauzac, Mathilde; Massey, Richard; Rhodes, Jason; McCarthy, Ian G
Authors
Dr Andrew Robertson andrew.robertson@durham.ac.uk
Academic Visitor
Sut-Ieng Tam sut-ieng.tam@durham.ac.uk
PGR Student Doctor of Philosophy
Professor Mathilde Jauzac mathilde.jauzac@durham.ac.uk
Professor
Professor Richard Massey r.j.massey@durham.ac.uk
Professor
Jason Rhodes
Ian G McCarthy
Abstract
If properly calibrated, the shapes of galaxy clusters can be used to investigate many physical processes: from feedback and quenching of star formation, to the nature of dark matter. Theorists frequently measure shapes using moments of inertia of simulated particles’. We instead create mock (optical, X-ray, strong- and weak-lensing) observations of the twenty-two most massive (∼1014.7 M⊙) relaxed clusters in the BAHAMAS simulations. We find that observable measures of shape are rounder. Even when moments of inertia are projected into 2D and evaluated at matched radius, they overestimate ellipticity by 56% (compared to observable strong lensing) and 430% (compared to observable weak lensing). Therefore, we propose matchable quantities and test them using observations of eight relaxed clusters from the Hubble Space Telescope and Chandra X-Ray Observatory. We also release our HST data reduction and lensing analysis software to the community. In real clusters, the ellipticity and orientation angle at all radii are strongly correlated. In simulated clusters, the ellipticity of inner (
Citation
Harvey, D., Robertson, A., Tam, S., Jauzac, M., Massey, R., Rhodes, J., & McCarthy, I. G. (2021). Reconciling galaxy cluster shapes, measured by theorists vs observers. Monthly Notices of the Royal Astronomical Society, 500(2), 2627-2644. https://doi.org/10.1093/mnras/staa3193
Journal Article Type | Article |
---|---|
Acceptance Date | Oct 6, 2020 |
Online Publication Date | Oct 15, 2020 |
Publication Date | 2021-01 |
Deposit Date | Oct 16, 2020 |
Publicly Available Date | Jul 16, 2021 |
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 | 500 |
Issue | 2 |
Pages | 2627-2644 |
DOI | https://doi.org/10.1093/mnras/staa3193 |
Public URL | https://durham-repository.worktribe.com/output/1259318 |
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Copyright Statement
© The Author(s) 2020. Published by Oxford University Press on behalf of The Royal Astronomical Society.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
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