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arxiv: 2606.01907 · v1 · pith:CIZKUEXPnew · submitted 2026-06-01 · 🌌 astro-ph.CO · astro-ph.GA

CSST large-scale structure analysis pipeline: IV. Cosmic Voids Identified from Galaxy Group Samples as Probes of the Large-scale Structure

Pith reviewed 2026-06-28 13:21 UTC · model grok-4.3

classification 🌌 astro-ph.CO astro-ph.GA
keywords cosmic voidsgalaxy groupslarge-scale structurevoid size functionvoid density profileCSSTredshift completenesshalo voids
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The pith

Voids found in galaxy group catalogs reproduce the statistics of halo voids even at 40 percent spectroscopic completeness.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper proposes identifying cosmic voids directly in galaxy group catalogs rather than individual galaxies or halos, because groups map more cleanly to dark matter halos and allow simpler theoretical modeling. Using mock catalogs built for the CSST survey at full and partial redshift completeness, the authors locate voids in the group samples and in the parent halo catalog, then compare two statistics: the void size function and the void density profile across five redshift bins. They show that group-void statistics match halo-void statistics when completeness reaches at least 40 percent; at 30 percent completeness an extra redshift-error term still recovers the match. This makes group-voids a practical complement to conventional void analyses, especially for emulator-based cosmological inference.

Core claim

Voids identified in mock galaxy group catalogs with spectroscopic redshift completeness of at least 40 percent produce void size functions and density profiles that faithfully match those measured in the underlying halo catalog; even at 30 percent completeness the match holds once a redshift error term is included. The brightest central galaxy is adopted as the group center to improve void centering accuracy. These results are obtained in five redshift intervals from z=0 to 1.0 using the reference mock galaxy redshift survey for CSST.

What carries the argument

Comparison of the void size function and void density profile measured on voids found in galaxy group catalogs versus the parent halo catalog, with groups centered on brightest central galaxies.

If this is right

  • Group-voids permit simpler theoretical modeling of large-scale structure than galaxy-based voids because groups associate directly with halos.
  • The approach remains usable down to 30 percent redshift completeness once a redshift error correction is applied.
  • Group-void catalogs offer a practical complement to standard void studies for surveys with incomplete spectroscopy.
  • The method is especially advantageous for emulator-based cosmological analyses that rely on accurate void statistics.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The same group-void approach could be applied to existing or future surveys with similar completeness levels to test consistency with halo-based results.
  • If the match holds in real data, void statistics from groups might reduce the need for full halo catalogs in large-volume cosmological forecasts.
  • Extending the analysis to cross-correlations between group-voids and other tracers could tighten constraints on void evolution models.

Load-bearing premise

The mock galaxy redshift survey used as reference accurately captures how real galaxies map onto groups and halos and how the void finder behaves on catalogs of varying completeness.

What would settle it

A statistically significant mismatch between group-void and halo-void size functions or density profiles in real CSST data at known completeness above 40 percent would falsify the central claim.

Figures

Figures reproduced from arXiv: 2606.01907 by Cheng Li, Feng Shi, Gong-Bo Zhao, Hong Guo, Hu Zhan, Hu Zou, Jipeng Sui, Pengjie Zhang, Qingyang Li, Run Wen, Xian Zhong Zheng, Xiaohu Yang, Xingchen Zhou, Yan Gong, Yingxiao Song, Yipeng Jing, Yizhou Gu, Youcai Zhang, Yunkun Han.

Figure 1
Figure 1. Figure 1: Left panel: The galaxy number density distribution from the ideal case (zspec) and the conservative case (zCSST) at z < 1. The dashed line shows the number distribution of galaxies with spectroscopic redshifts (zspec′ ) in the conservative case. Right panel: The number density distribution of halos and of groups from zspec and zCSST with log[M/h−1M⊙] ≥ 13 at z = 0 − 1. 2. MOCK DATA 2.1. Galaxy Catalog We u… view at source ↗
Figure 2
Figure 2. Figure 2: The VSF data from halo catalog (blue) and group catalogs with zspec (green) and zCSST (red) in the five redshift bins. The small subpanel shows the relative deviation δ between the VSF of the two group-void samples and that of the halo-voids. The shaded regions and error bars indicate the 1σ uncertainty of the VSF data [PITH_FULL_IMAGE:figures/full_fig_p005_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: The VSF data from the halo catalogs (blue) and group catalogs with zCSST (red) in the five redshift bins. The blue color becomes darker and the line style changes from solid to dashed, dash-dotted, and dash-double-dotted with increasing additional redshift errors applied to the halo catalog (σ0 = 0, 0.005, 0.01, 0.02). The small subpanel shows the relative deviation δ between the VSF of the halo-voids with… view at source ↗
Figure 4
Figure 4. Figure 4: Stacked void density profile from the halo catalog and the group catalogs with zspec in the five redshift bins. Colors from red to purple indicate the void radius bins ranging from Rv = 20 to 80 h −1Mpc. The shaded regions and error bars represent the 1σ error. The horizontal dashed line and vertical dotted line denote the mean background density and the void boundary (r/Rv = 1), respectively [PITH_FULL_I… view at source ↗
Figure 5
Figure 5. Figure 5: Stacked void density profile from the halo catalog and the group catalogs with zCSST identified using BCG in the first three redshift bins. Colors from red to cyan indicate the void radius bins ranging from Rv = 20 to 70 h −1Mpc. The shaded regions and error bars represent the 1σ error. The horizontal dashed line and vertical dotted line denote the mean background density and the void boundary (r/Rv = 1), … view at source ↗
Figure 6
Figure 6. Figure 6: Stacked void density profile from the halo catalog and the group catalogs with zCSST in the five redshift bins. Colors from red to purple indicate the void radius bins ranging from Rv = 20 to 80 h −1Mpc. The shaded regions and error bars represent the 1σ error. The horizontal dashed line and vertical dotted line denote the mean background density and the void boundary (r/Rv = 1), respectively [PITH_FULL_I… view at source ↗
read the original abstract

Because groups are directly associated with halos, they allow for considerably simpler theoretical modeling than approaches based on individual galaxies. We therefore propose to use voids identified in galaxy group catalogs, referred to as group-voids, to investigate the cosmic large-scale structure (LSS). Using the reference mock galaxy redshift survey (MGRS) designed for the Chinese Space-station Survey Telescope (CSST), we build two galaxy group catalogs representing ideal and conservative scenarios, derived from galaxy samples with 100\% and roughly 30\% spectroscopic redshift completeness, respectively. We then identify voids in these two mock group catalogs, as well as in the underlying halo catalog, and measure two void statistics, the void size function (VSF) and the void density profile, within five redshift intervals spanning $z=0$ to $1.0$. We compare the statistics obtained from two kinds of voids: those defined by galaxy groups (group-voids) and those defined by dark matter halos (halo-voids). In the void-finding process, we adopt the brightest central galaxy (BCG) as the group center to improve the accuracy of the inferred void centers. Our analysis shows that void statistics derived from group-voids with spectroscopic redshift completeness of at least 40\% can faithfully reproduce the corresponding statistics from halo-voids. Even when the redshift completeness of galaxies falls to as low as 30\%, we can still reliably describe group-voids via halo-voids by incorporating a redshift error term. This indicates that group-voids are a promising tool for probing LSS and offer a valuable complement to standard void studies, which is especially advantageous for emulator-based methods.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 1 minor

Summary. The manuscript proposes using voids identified in galaxy group catalogs (group-voids) as probes of large-scale structure for the CSST survey. Using a single reference mock galaxy redshift survey (MGRS), it constructs group catalogs at high (100%) and low (~30%) spectroscopic completeness, identifies voids with BCG centering, and compares the void size function (VSF) and density profiles to those from the underlying halo catalog across five redshift bins from z=0 to 1. The central claim is that group-void statistics faithfully reproduce halo-void statistics at >=40% completeness, and remain reliable at 30% completeness when a redshift error term is incorporated.

Significance. If the results generalize beyond the specific MGRS, the approach would enable simpler theoretical modeling of void statistics by directly linking groups to halos, offering a practical complement to galaxy-based void studies. This could be especially advantageous for emulator-based methods in upcoming surveys with incomplete redshift data.

major comments (2)
  1. [Abstract] Abstract: The reported agreement in VSF and density profiles between group-voids and halo-voids (at >=40% completeness, and at 30% with redshift error term) is measured entirely inside one reference MGRS. No cross-checks against independent simulations, alternative group finders, or different incompleteness models are described. This is load-bearing for the claim that group-voids can be used as halo-void proxies in actual CSST data, as any systematic in the MGRS galaxy-to-group assignment or void-finder response would directly affect the quantitative match.
  2. [Abstract] Abstract (and associated methods/results sections): The incorporation of a 'redshift error term' to describe group-voids at 30% completeness is presented as a rescue mechanism, but without explicit details on its functional form, derivation, or quantitative impact on the statistics (e.g., how it modifies the VSF or profiles), it is unclear whether this correction is robust or mock-specific.
minor comments (1)
  1. [Abstract] The abstract states 'roughly 30%' completeness for the conservative catalog; specifying the exact value used in the analysis would improve precision.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive comments. We address each major point below and indicate planned revisions to improve clarity and scope the claims appropriately.

read point-by-point responses
  1. Referee: [Abstract] Abstract: The reported agreement in VSF and density profiles between group-voids and halo-voids (at >=40% completeness, and at 30% with redshift error term) is measured entirely inside one reference MGRS. No cross-checks against independent simulations, alternative group finders, or different incompleteness models are described. This is load-bearing for the claim that group-voids can be used as halo-void proxies in actual CSST data, as any systematic in the MGRS galaxy-to-group assignment or void-finder response would directly affect the quantitative match.

    Authors: The MGRS is the designated reference mock constructed specifically to replicate CSST survey characteristics, including galaxy selection, redshift distributions, and incompleteness. Our analysis demonstrates the viability of the group-void approach within this controlled and representative framework. We agree that broader validation would be valuable but lies outside the present scope. We will revise the abstract and add a dedicated limitations paragraph in the discussion to explicitly note that results are derived from this single MGRS and to qualify the generalization to actual CSST data. revision: partial

  2. Referee: [Abstract] Abstract (and associated methods/results sections): The incorporation of a 'redshift error term' to describe group-voids at 30% completeness is presented as a rescue mechanism, but without explicit details on its functional form, derivation, or quantitative impact on the statistics (e.g., how it modifies the VSF or profiles), it is unclear whether this correction is robust or mock-specific.

    Authors: We will expand the methods section with the explicit functional form of the redshift error term, its derivation from the mock redshift uncertainties, and quantitative demonstrations of its effect on both the VSF and stacked density profiles at 30% completeness. These additions will clarify the implementation and its impact within the MGRS. revision: yes

Circularity Check

0 steps flagged

No circularity detected; validation is a direct mock-internal comparison without reduction to fitted inputs or self-citations

full rationale

The paper constructs group catalogs from a reference MGRS mock at varying completeness levels, identifies voids in both group and halo catalogs using the same void finder, and directly measures VSF and density profiles for comparison. This constitutes an empirical test inside one simulation rather than a derivation that reduces by construction to its own inputs. No equations or steps are shown where a prediction is statistically forced by a prior fit, where an ansatz is smuggled via self-citation, or where a uniqueness theorem from the same authors is invoked to force the result. The central claim (group-voids reproduce halo-voids at >=40% completeness) is therefore a reported measurement outcome, not a tautology. Self-citation of the MGRS design paper, if present, is not load-bearing for the reported agreement itself.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The claim depends on the fidelity of the MGRS mock and the assumption that BCG centering and the chosen void finder produce comparable catalogs.

axioms (1)
  • domain assumption The MGRS mock accurately represents CSST observations and the galaxy-group-halo correspondence.
    Used to construct the ideal and conservative group catalogs and to define the comparison baseline.

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discussion (0)

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