The intrinsic alignment of galaxy clusters and impact of projection effects

被引：3

作者：

Shi, Jingjing ^{[1
,2
]}

Sunayama, Tomomi ^{[3
,4
]}

Kurita, Toshiki ^{[1
]}

Takada, Masahiro ^{[1
,2
]}

Sugiyama, Sunao ^{[1
,2
]}

Mandelbaum, Rachel ^{[5
]}

Miyatake, Hironao ^{[3
]}

More, Surhud ^{[1
,6
]}

Nishimichi, Takahiro ^{[1
,7
,8
]}

Johnston, Harry ^{[9
]}

机构：

[1] Univ Tokyo, Kavli Inst Phys & Math Universe WPI, Inst Adv Study UTIAS, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778583, Japan

[2] Univ Tokyo, Ctr Data Driven Discovery CD3, Kavli IPMU WPI, UTIAS, Kashiwa, Chiba 2778583, Japan

[3] Nagoya Univ, Kobayashi Maskawa Inst Origin Particles & Universe, Nagoya 4648602, Japan

[4] Univ Arizona, Dept Astron & Steward Observ, 933 N Cherry Ave, Tucson, AZ 85719 USA

[5] Carnegie Mellon Univ, McWilliams Ctr Cosmol, Dept Phys, Pittsburgh, PA 15213 USA

[6] Interuniv Ctr Astron & Astrophys, Post Bag 4, Pune 411007, India

[7] Kyoto Univ, Yukawa Inst Theoret Phys, Ctr Gravitat Phys & Quantum Informat, Kyoto 6068502, Japan

[8] Kyoto Sangyo Univ, Fac Sci, Dept Astrophys & Atmospher Sci, Kyoto 6038555, Japan

[9] Univ Utrecht, Inst Theoret Phys, Princetonpl 5, NL-3584 CE Utrecht, Netherlands

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2024年 / 528卷 / 02期

关键词：

galaxies: clusters: general; large-scale structure of Universe; cosmology: observations; cosmology: theory; MATTER HALO ELLIPTICITY; CONSTRAINTS; LOWZ;

D O I：

10.1093/mnras/stae064

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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) similar to 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.

引用

页码：1487 / 1499

页数：13

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