HETDEX [OII] galaxies at z ≤ 0.48: Growth of structures from power spectrum multipoles
Abstract
We use the monopole and quadrupole power spectra of [\ion{O}{2}]-emitting galaxies in the HETDEX Public Data Release 1 to constrain the growth of cosmic structures at z≤0.48. We interpret the power spectra using a simulation-based model built from the Mucho-Uchuu-1G N-body simulation. The best-fit model reproduces the observed power spectra remarkably well up to kmax=0.7 h Mpc−1, and goodness-of-fit tests confirm that the HETDEX [\ion{O}{2}] clustering is consistent with the \textit{Planck} flat ΛCDM cosmology. We test the general relativity (GR) prediction for the linear growth index, γ≃ 0.55. When the Alcock-Paczyński parameters are held fixed at their fiducial values, we find consistency with the GR prediction, γ=0.55± 0.05. And, when the AP parameters are allowed to vary, γ=0.60± 0.07, which is consistent with both the GR prediction and the suppressed growth rate reported by \citet{Nguyen_2023}. These results establish HETDEX [\ion{O}{2}] galaxies as a competitive, independent low-redshift probe of the growth of structures and motivate future full cosmological inference.
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BibTeX
@misc{moon2026hetdex,
title = {{HETDEX [OII] galaxies at $z \le 0.48$: Growth of structures from power spectrum multipoles}},
author = {Jeongin Moon and Eiichiro Komatsu and Robin Ciardullo and Daniel J. Farrow and Karl Gebhardt and Caryl Gronwall and Gary J. Hill and Donghui Jeong and Erin Mentuch Cooper and Shun Saito and Ariel G. Sánchez and Donald P. Schneider},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.29591},
eprint = {2610.29591},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.29591},
}
RIS
TY - UNPB
TI - HETDEX [OII] galaxies at z ≤ 0.48: Growth of structures from power spectrum multipoles
AU - Jeongin Moon
AU - Eiichiro Komatsu
AU - Robin Ciardullo
AU - Daniel J. Farrow
AU - Karl Gebhardt
AU - Caryl Gronwall
AU - Gary J. Hill
AU - Donghui Jeong
AU - Erin Mentuch Cooper
AU - Shun Saito
AU - Ariel G. Sánchez
AU - Donald P. Schneider
PY - 2026
DA - 2026/10/21
PB - arXiv
DO - 10.48550/arxiv.2610.29591
UR - https://arxiv.org/abs/2610.29591
AB - We use the monopole and quadrupole power spectra of [\ion{O}{2}]-emitting galaxies in the HETDEX Public Data Release 1 to constrain the growth of cosmic structures at z≤0.48. We interpret the power spectra using a simulation-based model built from the Mucho-Uchuu-1G N-body simulation. The best-fit model reproduces the observed power spectra remarkably well up to k_max=0.7 h Mpc^−1, and goodness-of-fit tests confirm that the HETDEX [\ion{O}{2}] clustering is consistent with the \textit{Planck} flat ΛCDM cosmology. We test the general relativity (GR) prediction for the linear growth index, γ≃ 0.55. When the Alcock-Paczyński parameters are held fixed at their fiducial values, we find consistency with the GR prediction, γ=0.55± 0.05. And, when the AP parameters are allowed to vary, γ=0.60± 0.07, which is consistent with both the GR prediction and the suppressed growth rate reported by \citet{Nguyen_2023}. These results establish HETDEX [\ion{O}{2}] galaxies as a competitive, independent low-redshift probe of the growth of structures and motivate future full cosmological inference.
ER -