CHC-BH-VP0 Compact-Object Diagnostic Gates: Public EHT Morphology/Polarization Surfaces and GWOSC Remnant/Response Surfaces

The companion record is attached to the BH1/BH2 compact-object pair. BH1 owns the accessibility-boundary interpretation of black-hole horizons on stationary or adiabatically evolving exterior domains. BH2 owns return-facing response kernels and threshold diagnostics on declared black-hole-side response domains. The companion record supplies bounded public-data diagnostic surfaces for those two papers: center 1.16

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center The shared label $\BHdiag$TeX\BHdiag means that both lanes have reached public-data-backed diagnostic surfaces while remaining below paper-grade compact-object closure.

The EHT lane is anchored to public EHT releases. The Event Horizon Telescope 2017 public release provides VLBI 1-mm observations whose stated goals include event-horizon-scale imaging of M87* and Sagittarius A* and high-resolution imaging of OJ287, 3C279, Cen A, and NGC1052 [citation]. The EHT 2018 public release provides additional public release packages through the ALMA Science Portal and CyVerse Data Commons [citation]. Public M87* polarimetric release surfaces are also available through the EHT public data portal and associated EHT polarimetric analyses [citation].

The GWOSC lane is anchored to GWTC-3 public products. The GWOSC Event API lists GWTC-3 confident and marginal events, and confident events are defined by the public catalog criteria of the release page [citation]. Event-version pages expose event identifiers, GPS/UTC times, DOI, strain-file links, posterior/sample links where available, data-quality/timeline links, and public event quantities such as FAR, SNR, $p_{\rm astro}$TeXp_{\rm astro}, final mass, and final spin [citation]. GWOSC public-data documentation describes the open-data event portal and its strain, segment, confidence, parameter, posterior, and localization products [citation].

The public record is identified by companion source summaries that specify the source surfaces, retained derivatives, and non-claim boundary: center 1.10

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The compact public-source summary records retained public-source identities and derivative roles in the companion source summary. The two dominant retained public sources are the official M87* EHT target release surface and an extracted FITS member. Their public source is retained in the companion source summary and is not used to strengthen the manuscript claim beyond the stated diagnostic classification.

Direct target product and retained morphology surrogate

The direct EHT route used one official M87* target product and retained an extracted FITS member. Retained processing produced visibility-entry probes, dirty-image-style entry probes, ehtim dirty-image and Gaussian-proxy outputs, canonical-Obsdata-style translation, self-calibration follow-ons, and closure-phase-plus-amplitude regularized imaging follow-ons. The strongest local morphology-surrogate surface is the following compact-core elliptical-Gaussian family: center 1.12

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center The retained surrogate surface is internally stable across the retained processing paths, with major-axis range 82.287--83.582$\uas$TeX\uas, minor-axis range 16.488--20.820$\uas$TeX\uas, axis-ratio range 3.952--5.069, and flux range 0.032304--0.032600 Jy. This is a morphology-adjacent diagnostic surface, not a calibrated ring-diameter or image-domain asymmetry result.

Public calibrated Stokes-I surfaces

The companion record also uses public calibrated Stokes-I uvfits surfaces under 2024-D01-01. The retained public layer contains 24 files spanning days 111, 112, and 115; bands b1, b2, b3, and b4; and CASA and HOPS pipelines. Direct canonical ingestion succeeds. Both-gain self-calibration summaries over this public layer give major-axis range 19.312--113.184$\uas$TeX\uas, minor-axis range 18.551--45.236$\uas$TeX\uas, axis-ratio range 1.004--5.066, position-angle range 0.004--127.450 degrees, and flux range 0.884071--1.115537 Jy. The spread confirms that this layer is a bounded morphology-surrogate surface rather than a paper-grade ring observable.

Public polarimetric surfaces

The public M87* polarimetric lane ingests 24 files under 2023-D01-01. Short-baseline polarization summaries are computed under cuts $|b|\le 2.5\Glambda$TeX|b|\le 2.5\Glambda, intensity SNR at least 5, and polarization SNR at least 3. The retained summaries are: center 3pt 1.12

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center These are bounded short-baseline polarization-observable surfaces. They do not provide polarized image-domain morphology or theorem-level polarization closure.

The GWOSC lane uses the GWTC-3 confident and marginal event boards and public product-group identities. The retained confident-event lane has 35 event-board rows, 35 metadata-ready rows, 35 product-ready rows, and zero product-partial rows. A first 32-second public HDF5 short-window proxy preserved decay-toward-baseline count 21, post-event elevation count 3, and low-contrast proxy count 11. The later public frontier attaches preferred parameter-estimation/remnant anchors for all 35 confident events, including final spin and posterior/sample links.

The multi-window response surface over confident events is: center 1.12

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center The strongest GWOSC reading is therefore a public event-board/product-group freeze, preferred public parameter-estimation/remnant anchor layer, final-spin and posterior-link capture, and bounded multi-window short-strain response surface. It is not waveform-consistency closure, ringdown-residual closure, theorem-level return-kernel certification, or BH2 closure.

The diagnostic gate board is: center 1.12

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The lane classifications are: center 1.16

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center The labels are bounded labels. They do not certify a black-hole theorem, microscopic entropy theorem, quantum-gravity solution, EHT image-pipeline replacement, LVK/GWOSC waveform-pipeline replacement, CHC root compact-object inference law, paper-grade EHT ring observable, official ringdown residual, or theorem-level return-kernel closure.

The remaining BH1 boundary is not basic public-data availability. It is the absence of an authoritative image-domain observable contract with collaboration-grade calibration semantics, derived-observable uncertainty bookkeeping, official ring-diameter or asymmetry extraction semantics, polarized morphology acceptance rules, and a systematic uncertainty envelope accepted at the paper-observable level.

The remaining BH2 boundary is the absence of an official public event-level reconstructed waveform aligned to strain or an official public ringdown-residual product aligned to strain. Public posterior-sample ingestion can refine remnant summaries, but it does not close the missing waveform or ringdown-residual product layer.

The companion record reaches a bounded public-only diagnostic frontier for BH1 and BH2. The BH1 lane has a real EHT target-product acquisition, retained visibility/imaging entry, public calibrated/post-correlator release ingestion, and bounded public polarization-observable surface. The BH2 lane has a GWOSC event-board and product-group freeze, preferred public PE/remnant anchors, final-spin and posterior links, and bounded multi-window short-strain response surfaces. These results justify the shared label $\BHdiag$TeX\BHdiag. They also identify the remaining public boundary: BH1 lacks paper-grade morphology/polarization observable semantics, and BH2 lacks official waveform-consistency or ringdown-residual products. The diagnostic record is therefore sufficient for BH1/BH2 public diagnostic materialization, but not for compact-object theorem closure.

Data and code availability..

This companion manuscript uses public compact-object, gravitational-wave, or diagnostic reference materials as described in the text. No proprietary observational data are introduced. Cited public references and companion statements, where provided, are identified by the companion source summaries cited in the text.

Funding and competing interests..

No external funding was received for this work. The author declares no competing interests.