The intrinsic alignment of galaxy clusters and impact of projection effects
Author
Shi, J.Sunayama, T.
Kurita, T.
Takada, M.
Sugiyama, S.
Mandelbaum, R.
Miyatake, H.
More, S.
Nishimichi, T.
Johnston, H.
Affiliation
Department of Astronomy, Steward Observatory, University of ArizonaIssue Date
2024-01-09Keywords
cosmology: observationscosmology: theory
galaxies: clusters: general
large-scale structure of Universe
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Oxford University PressCitation
Jingjing Shi, Tomomi Sunayama, Toshiki Kurita, Masahiro Takada, Sunao Sugiyama, Rachel Mandelbaum, Hironao Miyatake, Surhud More, Takahiro Nishimichi, Harry Johnston, The intrinsic alignment of galaxy clusters and impact of projection effects, Monthly Notices of the Royal Astronomical Society, Volume 528, Issue 2, February 2024, Pages 1487–1499, https://doi.org/10.1093/mnras/stae064Rights
© The Author(s) 2024. Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
Galaxy clusters, being the most massive objects in the Universe, exhibit the strongest alignment with the large-scale structure. However, mis-identification of members due to projection effects from the large-scale structure can occur. We studied the impact of projection effects on the measurement of the intrinsic alignment of galaxy clusters, using galaxy cluster mock catalogues. Our findings showed that projection effects result in a decrease of the large-scale intrinsic alignment signal of the cluster and produce a bump at rp ∼ 1 h-1 Mpc, most likely due to interlopers and missed member galaxies. This decrease in signal explains the observed similar alignment strength between bright central galaxies and clusters in the SDSS redMaPPer cluster catalogue. The projection effect and cluster intrinsic alignment signal are coupled, with clusters having lower fractions of missing members or having higher fraction of interlopers exhibiting higher alignment signals in their projected shapes. We aim to use these findings to determine the impact of projection effects on galaxy cluster cosmology in future studies. © The Author(s) 2024.Note
Open access articleISSN
0035-8711Version
Final Published Versionae974a485f413a2113503eed53cd6c53
10.1093/mnras/stae064
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Except where otherwise noted, this item's license is described as © The Author(s) 2024. Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License.