{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:44Z4JOLUQSM3N2NGCNB6REHLMT","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"6192877fc4f3d605c03c57293aa4ae7b49039b3aab0c92e3b173284e7a76a05f","cross_cats_sorted":["astro-ph.CO"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2026-04-21T18:00:01Z","title_canon_sha256":"f35b90bcf1af4401b67e4e5cbf51ff4887fe0dcd4cbf0cc41c296ca1013fd63d"},"schema_version":"1.0","source":{"id":"2604.19867","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2604.19867","created_at":"2026-06-10T14:10:50Z"},{"alias_kind":"arxiv_version","alias_value":"2604.19867v1","created_at":"2026-06-10T14:10:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2604.19867","created_at":"2026-06-10T14:10:50Z"},{"alias_kind":"pith_short_12","alias_value":"44Z4JOLUQSM3","created_at":"2026-06-10T14:10:50Z"},{"alias_kind":"pith_short_16","alias_value":"44Z4JOLUQSM3N2NG","created_at":"2026-06-10T14:10:50Z"},{"alias_kind":"pith_short_8","alias_value":"44Z4JOLU","created_at":"2026-06-10T14:10:50Z"}],"graph_snapshots":[{"event_id":"sha256:88b3c199924730d4761cc6de8c7c51ec0093cb4c07ec695af533f33d1b451529","target":"graph","created_at":"2026-06-10T14:10:50Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":4,"items":[{"attestation":"unclaimed","claim_id":"C1","kind":"strongest_claim","source":"verdict.strongest_claim","status":"machine_extracted","text":"The re-evaluation confirms the previous result based on 6 absorption features, z=0.820 ± 0.001 and 4 emission features, z=0.821 ± 0.002. The alternative z=3.199± 0.003, based on 6 absorption and 2 emission lines is a worse fit, also compared to other spectra."},{"attestation":"unclaimed","claim_id":"C2","kind":"weakest_assumption","source":"verdict.weakest_assumption","status":"machine_extracted","text":"That the chosen line identifications at z=0.82 are the correct physical assignment and that the PypeIt pipeline plus custom Python fitting routines introduce no systematic wavelength or flux errors that would alter the relative goodness-of-fit between the two redshift solutions."},{"attestation":"unclaimed","claim_id":"C3","kind":"one_line_summary","source":"verdict.one_line_summary","status":"machine_extracted","text":"Re-analysis of KCWI spectra with PypeIt confirms Hamilton's object redshift at z=0.820, showing the MOIRCS z=3.2 fit is worse and the earlier data inconclusive due to slit coverage and calibration issues."},{"attestation":"unclaimed","claim_id":"C4","kind":"headline","source":"verdict.pith_extraction.headline","status":"machine_extracted","text":"Re-analysis of spectra confirms Hamilton's object has redshift 0.82 rather than 3.2"}],"snapshot_sha256":"81b625203c703c1590f4e465e6cf4f0e18be29efdf8b32eb1ce45736491bc81f"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[{"findings_count":0,"name":"ai_meta_artifact","ran_at":"2026-05-21T15:42:29.235025Z","status":"completed","version":"1.0.0"},{"findings_count":0,"name":"doi_compliance","ran_at":"2026-05-20T02:34:27.545494Z","status":"completed","version":"1.0.0"}],"endpoint":"/pith/2604.19867/integrity.json","findings":[],"snapshot_sha256":"077049a3e2fd589e13568ee03887f91c19161cb4cb3e1a3758a5405c75528de9","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Low-resolution spectrographs used to have difficulties to determine redshifts of galaxies at $z\\approx1$ and $z\\approx3$. Spectral emission and absorption lines of magnesium and iron redshifted to $z\\approx1$ fall close to hydrogen, silicon, and oxygen lines at $z\\approx3$. Here, we demonstrate that, even with modern, integrated field unit spectrographs, this task remains challenging. Hamilton's object, a blue star-forming galaxy, gravitationally lensed into three multiple images by the galaxy cluster SDSS J223010.47-081017.8 is such a case. Using the Blue Keck Cosmic Web Imager, its redshift ","authors_text":"Emilio E. Falco, Jenny Wagner, Richard E. Griffiths","cross_cats":["astro-ph.CO"],"headline":"Re-analysis of spectra confirms Hamilton's object has redshift 0.82 rather than 3.2","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2026-04-21T18:00:01Z","title":"Hamilton's Object Revisited: A challenging source redshift of a strong lensing configuration"},"references":{"count":40,"internal_anchors":0,"resolved_work":40,"sample":[{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":1,"title":"Bayliss, M. B., Hennawi, J. F., Gladders, M. D., et al. 2011, ApJS, 193, 8","work_id":"1b72dd4d-468b-4e40-8d40-3c7f5c17c8cf","year":2011},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":2,"title":"B., Grillo, C., Rosati, P., et al","work_id":"d3c62ee2-211d-4040-87e8-6f309ceaa4b0","year":2017},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":3,"title":"2025, MNRAS, 537, 2662","work_id":"6ec82412-da27-4eee-b5cc-056b78e143d9","year":2025},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":4,"title":"2018, A&A, 617, A62","work_id":"4c8f6400-09be-4175-9b6b-4fd12c8c912c","year":2018},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":5,"title":"E., Rudisel, M., Wagner, J., et al","work_id":"920577b7-78e0-4641-b0d1-0415119dd686","year":2021}],"snapshot_sha256":"12f17d4baa600d4ddc59fba236daef873510b82878af30704afb63efbfa55e76"},"source":{"id":"2604.19867","kind":"arxiv","version":1},"verdict":{"created_at":"2026-05-10T01:50:37.275662Z","id":"db0aa6d4-8692-4ac2-8382-aba62d3b98c0","model_set":{"reader":"grok-4.3"},"one_line_summary":"Re-analysis of KCWI spectra with PypeIt confirms Hamilton's object redshift at z=0.820, showing the MOIRCS z=3.2 fit is worse and the earlier data inconclusive due to slit coverage and calibration issues.","pipeline_version":"pith-pipeline@v0.9.0","pith_extraction_headline":"Re-analysis of spectra confirms Hamilton's object has redshift 0.82 rather than 3.2","strongest_claim":"The re-evaluation confirms the previous result based on 6 absorption features, z=0.820 ± 0.001 and 4 emission features, z=0.821 ± 0.002. The alternative z=3.199± 0.003, based on 6 absorption and 2 emission lines is a worse fit, also compared to other spectra.","weakest_assumption":"That the chosen line identifications at z=0.82 are the correct physical assignment and that the PypeIt pipeline plus custom Python fitting routines introduce no systematic wavelength or flux errors that would alter the relative goodness-of-fit between the two redshift solutions."}},"verdict_id":"db0aa6d4-8692-4ac2-8382-aba62d3b98c0"}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:9b4ac723bb8b345a641878810c92f6d5ac69041e6c74fe2bc6d4b19bd5330e8b","target":"record","created_at":"2026-06-10T14:10:50Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"6192877fc4f3d605c03c57293aa4ae7b49039b3aab0c92e3b173284e7a76a05f","cross_cats_sorted":["astro-ph.CO"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2026-04-21T18:00:01Z","title_canon_sha256":"f35b90bcf1af4401b67e4e5cbf51ff4887fe0dcd4cbf0cc41c296ca1013fd63d"},"schema_version":"1.0","source":{"id":"2604.19867","kind":"arxiv","version":1}},"canonical_sha256":"e733c4b9748499b6e9a61343e890eb64ded29b897e797b20c5f7768455337ff9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e733c4b9748499b6e9a61343e890eb64ded29b897e797b20c5f7768455337ff9","first_computed_at":"2026-06-10T14:10:50.518145Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-10T14:10:50.518145Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QptIiYDe0iLOduk5p/4YwjqI6Ijx5flWISYWv7u3DserKFbpIzvxTcZ5Lgr6lmvGHVnmFLse8iAdPTOfhv4fBw==","signature_status":"signed_v1","signed_at":"2026-06-10T14:10:50.519041Z","signed_message":"canonical_sha256_bytes"},"source_id":"2604.19867","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9b4ac723bb8b345a641878810c92f6d5ac69041e6c74fe2bc6d4b19bd5330e8b","sha256:88b3c199924730d4761cc6de8c7c51ec0093cb4c07ec695af533f33d1b451529"],"state_sha256":"c942144f6305112d9b02f82c0964e021731c290e36af391d0a31fd85641b0404"}