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REVIEW 2 major objections 1 minor 5 references

Topology of molecular clouds in the PHANGS-JWST catalogue in relation to the physical characteristics of their galaxies

T0 review · 2 major / 1 minor · reviewed 2026-06-28 · grok-4.3

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Pith's one-line read Molecular cloud topologies in the PHANGS-JWST catalogue correlate with galaxy physical characteristics.

desk verdict TDA on PHANGS-JWST clouds shows correlations but risks being an artifact of varying resolution. read the letter →

arxiv 2606.02803 v1 pith:CYVSS2Z7 submitted 2026-06-01 astro-ph.GA

Ignacio Morales-Gil This is my paper · ORCID
classification astro-ph.GA
keywords molecularcloudstopologicaldataanalysisPHANGS-JWSTgalaxypropertiescloudtopologystellarfeedbackmergingcorrelations
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

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

The reading

The paper applies topological data analysis to molecular clouds identified in the PHANGS-JWST catalogue. It demonstrates correlations between the resulting topological summaries and the physical properties of the host galaxies. These correlations arise because dynamical processes like cloud merging and stellar feedback reshape cloud topology. A sympathetic reader would care because this links small-scale cloud structures to large-scale galaxy evolution. If true, it suggests topology can serve as a probe for how galaxy environments affect star-forming regions.

What carries the argument

Topological summaries obtained from topological data analysis of molecular cloud structures.

What would settle it

A lack of significant correlations between galaxy properties and topological summaries in a larger or different sample of molecular clouds would challenge the findings.

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Extended reading notes

Core claim

Molecular clouds in the PHANGS-JWST catalogue are studied using topological data analysis because dynamical processes such as cloud merging and stellar feedback alter their topology. This reveals correlations between physical characteristics of galaxies and topological summaries of the clouds.

Load-bearing premise

The PHANGS-JWST catalogue provides a representative sample of molecular clouds whose topology is meaningfully altered by dynamical processes such as cloud merging and stellar feedback.

Editorial extensions

If this is right

  • Galaxy physical characteristics influence the topology of molecular clouds.
  • Topological data analysis can extract meaningful summaries from cloud observations.
  • Dynamical processes in galaxies affect cloud topology in detectable ways.
  • Correlations can be used to relate galaxy properties to cloud evolution.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • Such correlations might allow predictions of star formation rates from cloud topology alone.
  • Extending this to more galaxies could test if the relations hold across different environments.
  • Comparing with simulations of galaxy evolution would check if the observed topologies match predicted dynamical effects.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit.

Referee Report

2 major / 1 minor

Summary. The manuscript applies topological data analysis to molecular clouds identified in the PHANGS-JWST catalogue. Motivated by the effects of dynamical processes such as cloud merging and stellar feedback on cloud topology, it reports correlations between topological summaries of the clouds (e.g., Betti numbers or persistence features) and physical characteristics of the host galaxies.

Significance. If the correlations are shown to be robust after proper controls, the work could provide a novel observational link between galaxy-scale properties and the topological structure of molecular clouds, potentially informing models of ISM evolution and star formation. The study is presented as purely observational with no free parameters, model fitting, or invented entities.

major comments (2)
  1. [Abstract] Abstract and sample description: the claim that correlations exist between galaxy properties and topological summaries is presented without any information on statistical methods, significance thresholds, error handling, or controls. This prevents assessment of whether the data support the central claim.
  2. [Sample selection] Sample selection (galaxies at 4–20 Mpc): the factor-of-5 variation in physical resolution is not addressed via stratification, regression against distance/beam size, or similar. Topological measures of connectivity and voids are sensitive to resolved substructures, so any correlation with SFR, mass, or morphology risks being an observational artifact rather than evidence of dynamical alteration of topology.
minor comments (1)
  1. [Abstract] The abstract is extremely terse; expanding it to include a brief statement of methods and key controls would improve clarity.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their constructive comments, which highlight important areas for improving the clarity and robustness of our analysis. We address each major comment below.

read point-by-point responses

  1. Referee: [Abstract] Abstract and sample description: the claim that correlations exist between galaxy properties and topological summaries is presented without any information on statistical methods, significance thresholds, error handling, or controls. This prevents assessment of whether the data support the central claim.

    Authors: We agree that the abstract does not provide sufficient detail on the statistical methods. In the revised manuscript we will expand the abstract to include a concise description of the correlation analyses (Spearman rank correlations with associated p-values), the significance threshold employed, and the handling of uncertainties and multiple comparisons. revision: yes

  2. Referee: [Sample selection] Sample selection (galaxies at 4–20 Mpc): the factor-of-5 variation in physical resolution is not addressed via stratification, regression against distance/beam size, or similar. Topological measures of connectivity and voids are sensitive to resolved substructures, so any correlation with SFR, mass, or morphology risks being an observational artifact rather than evidence of dynamical alteration of topology.

    Authors: This is a legitimate concern given the sensitivity of topological measures to resolution. We will add an explicit analysis in the revised manuscript that regresses the topological summaries against physical resolution (distance and beam size) and examines whether the reported correlations with galaxy properties remain after controlling for resolution. We will also consider stratification by distance bins where appropriate. revision: yes

Circularity Check

0 steps flagged · score 0.0 of 10

No circularity: purely observational data analysis

full rationale

The manuscript is an observational study that computes topological summaries (Betti numbers, persistence features) from the PHANGS-JWST molecular-cloud catalogue and reports empirical correlations with galaxy properties. No derivation chain, first-principles model, fitted parameter, or predictive equation is presented whose output is shown to equal its input by construction. No self-citation is invoked as a uniqueness theorem or load-bearing premise, and no ansatz is smuggled. The central results are therefore independent empirical findings rather than tautological restatements of the input data or prior author work.

Assumptions & free parameters 0 free parameters · 0 assumptions · 0 invented entities

The abstract mentions no free parameters, axioms, or invented entities; the work relies on standard application of topological data analysis to an existing observational catalogue.

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Cite this review

Pith. "Pith review of Topology of molecular clouds in the PHANGS-JWST catalogue in relation to the physical characteristics of their galaxies." pith.science (2026). https://pith.science/paper/CYVSS2Z7

@misc{pith2026260602803,
  author       = {Pith},
  title        = {Pith review of: Topology of molecular clouds in the PHANGS-JWST catalogue in relation to the physical characteristics of their galaxies},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/CYVSS2Z7}},
  note         = {Machine review of arXiv:2606.02803}
}
read the original abstract

Molecular clouds are affected by dynamical processes such as cloud merging and stellar feedback that alter their topology. For this reason, the molecular clouds in the PHANGS-JWST catalogue are studied under the light of topological data analysis. This study shows correlations between physical characteristics of galaxies and topological summaries of molecular clouds.

Figures

Figures reproduced from arXiv: 2606.02803 by the authors.

Figure 1
Figure 1. Credit: NASA, ESA, CSA, STScI, Janice Lee (STScI), Thomas Williams (Oxford), PHANGS Team [PITH_FULL_IMAGE:figures/full_fig_p001_1.png] view at source ↗
Figure 2
Figure 2. Maps used in this work with logarithmic norm for the color. [PITH_FULL_IMAGE:figures/full_fig_p002_2.png] view at source ↗
Figure 3
Figure 3. As an example, this figure shows the persistence diagram of NGC 1433 under JWST’s f1000w filter. [PITH_FULL_IMAGE:figures/full_fig_p002_3.png] view at source ↗
Figures from the paper (5 more)
Figure 4
Figure 4. Figure 4: Maps of IC5332 under different filters. 3 Results SFRtot is the physical magnitude that correlates significantly with the most topological summaries. Physical to topology correlation table. The table of posteriors and predictive posterior distributions are in the appen…
Figure 5
Figure 5. Figure 5: Table of plots of topological vs physical magnitudes. [PITH_FULL_IMAGE:figures/full_fig_p006_5.png]
Figure 6
Figure 6. Figure 6: Regression posteriors 7 [PITH_FULL_IMAGE:figures/full_fig_p007_6.png]
Figure 7
Figure 7. Figure 7: Posterior predictive distributions 8 [PITH_FULL_IMAGE:figures/full_fig_p008_7.png]
Figure 8
Figure 8. Figure 8: Linear fits. Posteriors and plot with HDI in pale blue and the mean in darker blue. [PITH_FULL_IMAGE:figures/full_fig_p009_8.png]

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Reference graph

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5 extracted references · 2 canonical work pages

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Reviewed June 28, 2026 · model on record in the stance chip above.