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arxiv: 2606.17626 · v1 · pith:EDO2ULWEnew · submitted 2026-06-16 · 🌌 astro-ph.CO

PSZ: The meta-catalogue of Planck Sunyaev-Zeldovich sources

P. Tarr\'io , M. Arnaud , J.-B. Melin , G.W. Pratt , T. Sadibekova This is my paper

Pith reviewed 2026-06-27 00:08 UTC · model grok-4.3

classification 🌌 astro-ph.CO
keywords Sunyaev-Zeldovich clustersPlanck cataloguegalaxy cluster validationcluster mass estimatescosmology
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The pith

The PSZ meta-catalogue compiles 1500 confirmed Planck Sunyaev-Zeldovich clusters with updated redshifts and selection-corrected masses.

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

The paper assembles a single meta-catalogue of all Planck SZ detections by merging optical and X-ray follow-up results with cross-matches to external catalogues such as MCXC-II and eROSITA. It reports 1500 confirmed clusters including 281 new confirmations, invalidates 262 candidates as noise, and leaves 200 awaiting validation. Redshifts are updated for 274 clusters and newly assigned for 278 others. A new homogeneous mass estimate corrected for selection effects is supplied for every confirmed cluster along with posterior probability contours in the Y5R500-θs plane. A cross-identification method that supplements positional matching with mass, redshift, and angular-size checks is also presented.

Core claim

The PSZ meta-catalogue contains 1962 entries that consolidate validation status for every official Planck SZ source, resulting in 1500 confirmed clusters, 262 noise-dominated detections, and 200 unconfirmed candidates, together with 274 updated redshifts, 278 newly assigned redshifts, new posterior probability contours, and selection-corrected M500 values for the confirmed sample.

What carries the argument

The validation and cross-identification procedure that combines follow-up campaigns with external catalogue matches and adds consistency checks on mass proxies, redshifts, and distance-versus-angular-size relations.

If this is right

  • The catalogue supplies a cleaner input sample for cosmological constraints derived from cluster abundance.
  • Uniform selection-corrected mass estimates enable direct comparison of cluster properties across the full confirmed set.
  • The 200 remaining candidates can be targeted for efficient follow-up to increase the confirmed sample.
  • The demonstrated need for mass and redshift consistency checks beyond fixed-distance matching improves reliability of future multi-catalogue work.

Where Pith is reading between the lines

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

  • The approach of building meta-catalogues from multiple validation sources could reduce duplication in other large cluster surveys.
  • Probability contours supplied for all sources allow statistical analyses that include candidates without forcing binary confirmed/unconfirmed labels.
  • The cross-identification rules may generalize to other wavelength regimes where simple positional matches produce false duplicates.

Load-bearing premise

The optical and X-ray follow-up data together with external catalogue cross-matches correctly classify sources as confirmed clusters versus noise or unconfirmed candidates with negligible contamination or incompleteness.

What would settle it

An independent spectroscopic or X-ray survey of a random subset of the 1500 confirmed clusters that finds a contamination rate substantially above the level implied by the validation process would falsify the reported counts.

Figures

Figures reproduced from arXiv: 2606.17626 by G.W. Pratt, J.-B. Melin, M. Arnaud, P. Tarr\'io, T. Sadibekova.

Figure 1
Figure 1. Figure 1: Example of a PSZ cluster with STATUS=Complex. Planck, X–ray and DESI images from left to right. The objects from different surveys are color-coded and listed with redshift on each panel. The cluster centers are marked with points. Big circles have a radius of R500 computed from corresponding X–ray or SZE survey data. PSZ2 G224.37-47.33 is a double cluster at z = 0.3. The two components, 1eRASS J040416.5-27… view at source ↗
Figure 2
Figure 2. Figure 2: Example of a PSZ cluster with STATUS=Confusion. Planck, X–ray and DESI images from left to right with layout as in [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Overlap between Planck catalogues. G189.82-37.25 which is a false detection (Sayers et al. 2012). The cross-match of ESZ clusters with PSZ1 or PSZ2 clus￾ters is not explicitly performed in the PSZ1 and PSZ2 cat￾alogues. The histogram of the distances between each ESZ cluster and its closest neighbour in the union of PSZ2 and PSZ1 catalogues7 is bimodal with a large gap between two components, at D < 4 ′ an… view at source ↗
Figure 4
Figure 4. Figure 4: Comparison of redshift from follow-up published after the original PSZ catalogues. Prominent outliers are labelled and discussed in the text. Left panel: Comparison of the favored redshift to redshift from other follow-up campaigns. Right panel: Comparison of spectroscopic redshift with original catalogue value if it was available. Most of those are photometric and can be replaced by the new redshift. that… view at source ↗
Figure 5
Figure 5. Figure 5: Criteria for matching PSZ candidates to MCXC-II clusters. Left: Distance between each PSZ candidate and its possible two-way MCXC-II association versus their relative distance in terms of the MCXC-II cluster size θ500. Regions A, B, and C are shown in green, yellow, and red, respectively. Green/red dots indicate whether the association is finally kept/rejected. Blue pluses and black crosses correspond, res… view at source ↗
Figure 6
Figure 6. Figure 6: Criteria for matching PSZ candidates to eRASS clusters. Left: Distance between each PSZ candidate and its possible two-way eRASS association versus their relative distance in terms of θ500 computed at the eRASS redshift. Regions A, B, and C are shown in green, yellow, and red, respectively. Green/red dots indicate whether the association is finally kept/rejected. Right: Deviations from the Y500-L500 relati… view at source ↗
Figure 7
Figure 7. Figure 7: Criteria for matching PSZ candidates to RASS-MCMF clusters. The distance between each PSZ candidate and its possible two-way RASS-MCMF association is plotted against their relative distance in terms of the PSZ cluster size θ500 recalculated at the RASS-MCMF redshift. Regions A, B, and C are shown in green, yellow, and red, respectively. Green/red dots indicate, for PSZ candidates (without z), whether the a… view at source ↗
Figure 8
Figure 8. Figure 8: Criteria for matching PSZ candidates to PSZ-MCMF clusters. The distance d between each PSZ candidate and possible two-way PSZ￾MCMF association is plotted against their relative distance in terms of the PSZ cluster size θ500 recalculated at the PSZ-MCMF redshift. The symbols are the same as in [PITH_FULL_IMAGE:figures/full_fig_p011_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: Confirmed (blue) and unknown (red) PSZ candidates in the area covered by eRASS and DES. Filled circles represent objects in the PSZ-MCMF footprint (i.e. where PSZ-MCMF searched for optical counterparts). Black crosses mark invalidated candidates. Blue/green/red regions represent the eRASS/ACT/DES footprints, respectively. We first assessed confirmed PSZ objects. There are 228 such objects in the DES∩eRASS … view at source ↗
Figure 10
Figure 10. Figure 10: Comparison of redshifts from the present updated PSZ with that of the updated PZ2 catalogue of Bahk & Hwang (2024). Open boxes and circles denote new and updated values, respectively. Prominent outliers are labelled and discussed Tab. 2 and Sect. 7.2. 7. Comparison with the PSZ2 update of Bahk & Hwang (2024) 7.1. Input data and method During the course of this work, Bahk & Hwang (2024, hereafter BH24) pub… view at source ↗
Figure 11
Figure 11. Figure 11: Degeneracy contours corrected (filled coloured con￾tours) and uncorrected (solid blue line) for selection effects for PSZ2 G056.79-11.60. The contours show the 68%, 95% and 99% confi￾dence limits from the innermost to the outermost. Solid and dashed black lines are ridge and ±68% degeneracy lines for the corrected contours. The X–ray prior at the cluster redshift z = 0.12 is shown as the solid cyan line. … view at source ↗
Figure 12
Figure 12. Figure 12: Ratio between the PSZ1 and the PSZ2 masses as a function of PSZ2 masses. The published PSZ1 masses are systematically over￾estimated (resp. underestimated) for the MMF1 (resp. PwS) detection algorithm with respect to the PSZ2 masses. The PSZ1 and PSZ2 masses are consistent for MMF3. 8.2. New estimation of PSZ1 and PSZ2 masses The limitations on the published PSZ1 masses discussed in Sect. 8.1, and the nee… view at source ↗
Figure 14
Figure 14. Figure 14: Ratio between the corrected and uncorrected PSZ masses as a function of the relative error on the uncorrected mass. The correc￾tion increases with the relative error on the uncorrected mass, reaching approximately 20-30% for a relative error on the uncorrected mass of 10-15%. The three clear outliers are surrounded by a black circle and discussed in the text. distributed inhomogeneously in the (θs , Y5R50… view at source ↗
Figure 15
Figure 15. Figure 15: Procedure for the construction of the PSZ. Left: Construction of the union of Planck catalogues. Main modifications of the original catalogues are indicated. Right Summary of the procedure for the update of PSZ candidates status and redshift, with reference to corresponding sections. The source and number of objects of various status at each step are indicated on the left and right of the tree. The status… view at source ↗
Figure 16
Figure 16. Figure 16: Distribution of the confirmed PSZ clusters in the z–M500 plane. Newly confirmed objects and updated redshifts are indicated by red crosses and blue open circles, respectively. the original Planck catalogues and subsequently invalidated. This includes the 2 clusters invalidated in Sect. 3.5, 9 sources invali￾dated with the optical follow-up, 1 with XMM-Newton archive, and 4 invalidated in the mass analysis… view at source ↗
Figure 18
Figure 18. Figure 18: Sky distribution of the PSZ objects colour-coded by their final status. The grey/blue/red shaded regions represent the RASS￾MCMF/eRASS/DES footprints, respectively. probabilities P(FALSE|Q < 0.4) and P(TRUE|Q > 0.4) do depend on the sub-sample under consideration. Assuming a fraction of false candidates of ∼19% (Sect. 9.2), and applying Bayes’ theo￾rem, we obtain a probability that a candidate with Qneura… view at source ↗
Figure 3
Figure 3. Figure 3: ). The optical counterpart is likely WHY J233054.0- [PITH_FULL_IMAGE:figures/full_fig_p031_3.png] view at source ↗
read the original abstract

We present the PSZ, a meta-catalogue of 1962 clusters and cluster candidates produced by the Planck Collaboration. The PSZ contains fully-updated validation information for all official Planck catalogue detections, together with redshift estimates for confirmed clusters, with no duplicate entries. The validation is derived from optical and X-ray follow-up campaigns, supplemented by cross-matching with external catalogues with redshift information, and with XMM-Newton archive data. The external catalogues considered include the all-sky X-ray catalogue MCXC-II, the eROSITA X-ray cluster catalogue, the RASS-MCMF and PSZ-MCMF catalogues, and the extended Planck catalogues of Burenin. A total of 281 clusters are newly-confirmed owing to this process; conversely, 262 Planck candidates are invalidated. Of the 1500 confirmed clusters, 274 have updated redshifts, and 278 have newly-assigned redshifts. An MCXC-II counterpart is assigned to 631 clusters, updating the MCXC cross-match published in the Planck catalogues. Differences with the PSZ2 update of Bahk & Hwang are discussed. We further introduce a new, homogeneously-derived mass estimate, corrected for selection effects owing to intrinsic scatter and the properties of the underlying mass function. New posterior probability contours in the $Y_{5R500}-\theta_s$ plane are provided for all sources, in addition to the corresponding $M_{500}(z)$ degeneracy curves. PSZ includes both corrected and uncorrected $M_{500}$ values for confirmed clusters. A methodology for cross-identification between catalogues is presented. We show that simple fixed-distance matching is insufficient for this task, and demonstrate the need for additional consistency checks based on mass proxies, redshifts, and distance versus angular size comparisons. The final PSZ comprises 1500 confirmed clusters, 262 noise-dominated detections, and 200 candidates awaiting validation.

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

1 major / 1 minor

Summary. The manuscript presents the PSZ meta-catalogue compiling 1962 Planck SZ detections into a duplicate-free resource. It updates validation for all sources via optical/X-ray follow-up and cross-matches to external catalogues (MCXC-II, eROSITA, RASS-MCMF, etc.), reporting 1500 confirmed clusters (281 newly confirmed), 262 invalidated, 200 candidates, 274 updated redshifts, 278 new redshifts, new selection-corrected M500 values, and posterior probability contours in the Y5R500-θs plane. A cross-identification methodology is described that requires consistency checks on mass proxies, redshifts, and angular size versus distance beyond fixed-distance matching.

Significance. If the validation and mass-correction procedures hold, the PSZ provides a consolidated, homogeneous reference catalogue with corrected masses that accounts for intrinsic scatter and mass-function effects. This strengthens the utility of Planck SZ data for cosmological analyses and cluster studies by reducing duplicates and supplying updated redshifts and selection-corrected masses for the full sample.

major comments (1)
  1. [Abstract] Abstract: The central claims of 1500 confirmed clusters, 281 new confirmations, and 262 invalidations rest on the cross-matching and validation procedures achieving negligible contamination and incompleteness. However, no quantitative metrics (purity, completeness, false-positive rates from mocks, or overlap statistics with independent surveys) are supplied to support this, despite the abstract noting that fixed-distance matching alone is insufficient and additional consistency checks are applied.
minor comments (1)
  1. The differences with the PSZ2 update of Bahk & Hwang are mentioned but would benefit from a dedicated comparison table listing key discrepancies in validation status or redshifts.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their review. We address the single major comment below and agree that additional quantitative support for the validation claims will improve the manuscript.

read point-by-point responses

  1. Referee: [Abstract] Abstract: The central claims of 1500 confirmed clusters, 281 new confirmations, and 262 invalidations rest on the cross-matching and validation procedures achieving negligible contamination and incompleteness. However, no quantitative metrics (purity, completeness, false-positive rates from mocks, or overlap statistics with independent surveys) are supplied to support this, despite the abstract noting that fixed-distance matching alone is insufficient and additional consistency checks are applied.

    Authors: We agree that the manuscript would be strengthened by explicit quantitative metrics. The reported numbers of confirmed clusters, new confirmations, and invalidations are obtained from the combination of published optical/X-ray follow-up results and systematic cross-matches to MCXC-II, eROSITA, RASS-MCMF, and the Burenin catalogues, using the consistency checks on mass proxies, redshifts, and angular-size versus distance relations described in the text. Because PSZ is a meta-catalogue rather than a new survey, we did not generate fresh mock catalogues; however, we can and will add overlap statistics (e.g., confirmation fractions with eROSITA and MCXC-II, and the fraction of sources rejected on the basis of redshift or mass-proxy inconsistencies). These will be incorporated as a new table and brief subsection in the revised version. revision: yes

Circularity Check

0 steps flagged

No circularity; meta-catalogue is a data compilation with no self-referential derivations.

full rationale

The paper compiles Planck SZ detections into a meta-catalogue by cross-matching with external catalogues (MCXC-II, eROSITA, RASS-MCMF, etc.) and incorporating optical/X-ray follow-up. No equations, fitted parameters, or derivations are described that reduce the reported counts (1500 confirmed clusters, 281 new confirmations), redshifts, or mass estimates to quantities defined or fitted within the same work. The central outputs are direct products of external validation steps, making the result self-contained against independent benchmarks rather than circular by construction.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

The selection-corrected mass estimates rest on assumptions about the intrinsic scatter in the Y-M relation and the shape of the underlying halo mass function; these act as domain assumptions whose specific functional forms and parameter values are not provided in the abstract.

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