The intrinsic alignment of galaxy clusters and impact of projection effects

Jingjing Shi; Tomomi Sunayama; Toshiki Kurita; Masahiro Takada; Sunao Sugiyama; Rachel Mandelbaum; Hironao Miyatake; Surhud More; Takahiro Nishimichi; Harry Johnston

doi:10.1093/mnras/stae064

The intrinsic alignment of galaxy clusters and impact of projection effects

Jingjing Shi^*, Tomomi Sunayama, Toshiki Kurita, Masahiro Takada, Sunao Sugiyama, Rachel Mandelbaum, Hironao Miyatake, Surhud More, Takahiro Nishimichi, Harry Johnston

^*Corresponding author for this work

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

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 r_p ∼ 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.

Original language	English
Pages (from-to)	1487-1499
Number of pages	13
Journal	Monthly Notices of the Royal Astronomical Society
Volume	528
Issue number	2
DOIs	https://doi.org/10.1093/mnras/stae064
Publication status	Published - 1 Feb 2024

Bibliographical note

Publisher Copyright:
© The Author(s) 2024.

Funding

Funders	Funder number
WPI Initiative
World Premier International Research Center Initiative
Japan Society for the Promotion of Science	JP20H05855, JP21H01081, JP20H05850, JP20H05861, JP22K03634, JP19H00677
Japan Society for the Promotion of Science
Ministry of Education, Culture, Sports, Science and Technology
University of Tokyo
Yukawa Institute for Theoretical Physics, Kyoto University

Keywords

cosmology: observations
cosmology: theory
galaxies: clusters: general
large-scale structure of Universe

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10.1093/mnras/stae064Licence: CC BY

stae064Final published version, 1.67 MBLicence: CC BY

Cite this

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title = "The intrinsic alignment of galaxy clusters and impact of projection effects",

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.",

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doi = "10.1093/mnras/stae064",

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AU - Shi, Jingjing

AU - Sunayama, Tomomi

AU - Kurita, Toshiki

AU - Takada, Masahiro

AU - Sugiyama, Sunao

AU - Mandelbaum, Rachel

AU - Miyatake, Hironao

AU - More, Surhud

AU - Nishimichi, Takahiro

AU - Johnston, Harry

PY - 2024/2/1

Y1 - 2024/2/1

N2 - 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.

AB - 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.

KW - cosmology: observations

KW - cosmology: theory

KW - galaxies: clusters: general

KW - large-scale structure of Universe

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ER -

The intrinsic alignment of galaxy clusters and impact of projection effects

Abstract

Bibliographical note

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Keywords

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