Year: 2026
Type: preprint
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 $z\le0.48$. 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 $k_\mathrm{max}=0.7~h~\mathrm{Mpc}^{-1}$, and goodness-of-fit tests confirm that the HETDEX [\ion{O}{2}] clustering is consistent with the \textit{Planck} flat $Λ$CDM cosmology. We test the general relativity (GR) prediction for the linear growth index, $γ\simeq 0.55$. When the Alcock-Paczyński parameters are held fixed at their fiducial values, we find consistency with the GR prediction, $γ=0.55\pm 0.05$. And, when the AP parameters are allowed to vary, $γ=0.60\pm 0.07$, 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.
Source: arXiv (Cornell University)
Institutions: Max Planck Institute for Astrophysics, Ludwig-Maximilians-Universität München, University of Hull, The University of Texas at Austin, Pennsylvania State University, McDonald Observatory, Kavli Institute for the Physics and Mathematics of the Universe, Missouri University of Science and Technology, The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Max Planck Institute for Extraterrestrial Physics
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, University of Texas at Austin, Missouri University of Science and Technology, University of Oxford, Deutsche Forschungsgemeinschaft, Georg-August-Universität Göttingen, Ludwig-Maximilians-Universität München, Leibniz-Institut für Astrophysik Potsdam, Department of Mechanical Engineering, University of Texas at Austin, U.S. Air Force, Leibniz-Gemeinschaft
OpenAlex ID: W7223223770