B-modes from galaxy cluster alignments in future surveys

Christos Georgiou; Thomas Bakx; Juliard van Donkersgoed; Nora Elisa Chisari

doi:10.33232/001c.117495

B-modes from galaxy cluster alignments in future surveys

Christos Georgiou, Thomas Bakx, Juliard van Donkersgoed, Nora Elisa Chisari

Research output: Contribution to journal › Article › Academic

Abstract

Intrinsic alignment (IA) of source galaxies represents an important contaminant for upcoming cosmic shear surveys. In particular, it is expected on general grounds that IA contains a B-mode while the weak lensing signal does not. Thus, a detection of B-modes offers the possibility to study directly the IA signal of the sources. Galaxy clusters exhibit strong IA and are therefore a natural candidate to look for a B-mode signal. We forecast the signal-to-noise ratio (SNR) for B-modes from IA of galaxy clusters in the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST). We use a perturbative model for the IA multipoles based on the Effective Field Theory of Intrinsic Alignments (EFT of IA), which has recently been validated against N-body simulations. We forecast SNR $\approx 12$ and find that this detectability is not significantly impacted by different analysis choices. Lastly, we also apply our forecast to clusters in the redMaPPer SDSS and DESY1 samples. We find SNR $\approx 5$ and SNR $\approx 3$, respectively, suggesting a detection is within reach, provided accurate redshift information is available.

Original language	English
Number of pages	10
Journal	Open Journal of Astrophysics
Volume	7
DOIs	https://doi.org/10.33232/001c.117495
Publication status	Published - May 2024

Bibliographical note

Publisher Copyright:
© 2024, National University of Ireland Maynooth. All rights reserved.

Funding

The authors would like to thank Dr. Michel Aguena and Dr. Eli Rykoff for useful discussions on the forecast of the cluster sample. This publication is part of the project \u201CA rising tide: Galaxy intrinsic alignments as a new probe of cosmology and galaxy evolution\u201D (with project number VI.Vidi.203.011) of the Talent programme Vidi which is (partly) financed by the Dutch Research Council (NWO). This work is also part of the Delta ITP consortium, a program of the Netherlands Organisation for Scientific Research (NWO) that is funded by the Dutch Ministry of Education, Culture and Science (OCW). We thank Henk Hoekstra and Maria Cristina Fortuna for sharing preliminary results from their manuscript in preparation with us, and Henk Hoek-stra for useful discussions.

Funders
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Ministerie van onderwijs, cultuur en wetenschap
Delta

Keywords

Cosmology
cosmic shear
galaxy clusters
intrinsic alignments
weak gravitational lensing

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10.33232/001c.117495Licence: CC BY

2309.03841v2Submitted manuscript, 829 KBLicence: CC BY

Cite this

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title = "B-modes from galaxy cluster alignments in future surveys",

abstract = " Intrinsic alignment (IA) of source galaxies represents an important contaminant for upcoming cosmic shear surveys. In particular, it is expected on general grounds that IA contains a B-mode while the weak lensing signal does not. Thus, a detection of B-modes offers the possibility to study directly the IA signal of the sources. Galaxy clusters exhibit strong IA and are therefore a natural candidate to look for a B-mode signal. We forecast the signal-to-noise ratio (SNR) for B-modes from IA of galaxy clusters in the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST). We use a perturbative model for the IA multipoles based on the Effective Field Theory of Intrinsic Alignments (EFT of IA), which has recently been validated against N-body simulations. We forecast SNR \$\textbackslash{}approx 12\$ and find that this detectability is not significantly impacted by different analysis choices. Lastly, we also apply our forecast to clusters in the redMaPPer SDSS and DESY1 samples. We find SNR \$\textbackslash{}approx 5\$ and SNR \$\textbackslash{}approx 3\$, respectively, suggesting a detection is within reach, provided accurate redshift information is available. ",

keywords = "Cosmology, cosmic shear, galaxy clusters, intrinsic alignments, weak gravitational lensing",

author = "Christos Georgiou and Thomas Bakx and Donkersgoed, \{Juliard van\} and Chisari, \{Nora Elisa\}",

year = "2024",

month = may,

doi = "10.33232/001c.117495",

language = "English",

volume = "7",

journal = "Open Journal of Astrophysics",

issn = "2565-6120",

publisher = "National University of Ireland Maynooth",

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T1 - B-modes from galaxy cluster alignments in future surveys

AU - Georgiou, Christos

AU - Bakx, Thomas

AU - Donkersgoed, Juliard van

AU - Chisari, Nora Elisa

PY - 2024/5

Y1 - 2024/5

N2 - Intrinsic alignment (IA) of source galaxies represents an important contaminant for upcoming cosmic shear surveys. In particular, it is expected on general grounds that IA contains a B-mode while the weak lensing signal does not. Thus, a detection of B-modes offers the possibility to study directly the IA signal of the sources. Galaxy clusters exhibit strong IA and are therefore a natural candidate to look for a B-mode signal. We forecast the signal-to-noise ratio (SNR) for B-modes from IA of galaxy clusters in the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST). We use a perturbative model for the IA multipoles based on the Effective Field Theory of Intrinsic Alignments (EFT of IA), which has recently been validated against N-body simulations. We forecast SNR $\approx 12$ and find that this detectability is not significantly impacted by different analysis choices. Lastly, we also apply our forecast to clusters in the redMaPPer SDSS and DESY1 samples. We find SNR $\approx 5$ and SNR $\approx 3$, respectively, suggesting a detection is within reach, provided accurate redshift information is available.

AB - Intrinsic alignment (IA) of source galaxies represents an important contaminant for upcoming cosmic shear surveys. In particular, it is expected on general grounds that IA contains a B-mode while the weak lensing signal does not. Thus, a detection of B-modes offers the possibility to study directly the IA signal of the sources. Galaxy clusters exhibit strong IA and are therefore a natural candidate to look for a B-mode signal. We forecast the signal-to-noise ratio (SNR) for B-modes from IA of galaxy clusters in the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST). We use a perturbative model for the IA multipoles based on the Effective Field Theory of Intrinsic Alignments (EFT of IA), which has recently been validated against N-body simulations. We forecast SNR $\approx 12$ and find that this detectability is not significantly impacted by different analysis choices. Lastly, we also apply our forecast to clusters in the redMaPPer SDSS and DESY1 samples. We find SNR $\approx 5$ and SNR $\approx 3$, respectively, suggesting a detection is within reach, provided accurate redshift information is available.

KW - Cosmology

KW - cosmic shear

KW - galaxy clusters

KW - intrinsic alignments

KW - weak gravitational lensing

UR - https://www.scopus.com/pages/publications/85194053415

U2 - 10.33232/001c.117495

DO - 10.33232/001c.117495

M3 - Article

SN - 2565-6120

VL - 7

JO - Open Journal of Astrophysics

JF - Open Journal of Astrophysics

ER -

B-modes from galaxy cluster alignments in future surveys

Abstract

Bibliographical note

Funding

Keywords

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