{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2024:M56HII6MFB66GWQYRJRJFMH4SA","short_pith_number":"pith:M56HII6M","schema_version":"1.0","canonical_sha256":"677c7423cc287de35a188a6292b0fc903b3b08d365e1929b01764685f99f9b03","source":{"kind":"arxiv","id":"2411.04177","version":1},"attestation_state":"computed","paper":{"title":"J1721+8842: The first Einstein zig-zag lens","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"A. A. Galan, A. Agnello, A. Andrade, A. J. Shajib, A. Schweinfurth, A. Smette, C. Lemon, D. Sluse, E. Paic, F. Courbin, F. Dux, J. Hjorth, K. C. Wong, M. Millon, S. Birrer, S. H. Suyu, S. Schuldt, T. Schmidt, T. Treu","submitted_at":"2024-11-06T19:00:01Z","abstract_excerpt":"We report the discovery of the first example of an Einstein zig-zag lens, an extremely rare lensing configuration. In this system, J1721+8842, six images of the same background quasar are formed by two intervening galaxies, one at redshift $z_1 = 0.184$ and a second one at $z_2 = 1.885$. Two out of the six multiple images are deflected in opposite directions as they pass the first lens galaxy on one side, and the second on the other side -- the optical paths forming zig-zags between the two deflectors. In this letter, we demonstrate that J1721+8842, previously thought to be a lensed dual quasa"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2411.04177","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2024-11-06T19:00:01Z","cross_cats_sorted":[],"title_canon_sha256":"7e03a90eee674b5e5051f3f8c78099cf4267456ecd2bc07d0b61e86d868b2cb4","abstract_canon_sha256":"151cf6592b57abaa6118146e4e993dfaf6da1ed151e78dd31cb1decc8b97a0f0"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T10:19:30.729996Z","signature_b64":"bopN7uy0Kb6mqJnRyOAuSiAOKjUk+94mVQmKbdYfYOAmc3T1npjR2OHHjegH2XSRw8l/H+4Dr9jcfIMRoroqAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"677c7423cc287de35a188a6292b0fc903b3b08d365e1929b01764685f99f9b03","last_reissued_at":"2026-07-05T10:19:30.729501Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T10:19:30.729501Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"J1721+8842: The first Einstein zig-zag lens","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"A. A. Galan, A. Agnello, A. Andrade, A. J. Shajib, A. Schweinfurth, A. Smette, C. Lemon, D. Sluse, E. Paic, F. Courbin, F. Dux, J. Hjorth, K. C. Wong, M. Millon, S. Birrer, S. H. Suyu, S. Schuldt, T. Schmidt, T. Treu","submitted_at":"2024-11-06T19:00:01Z","abstract_excerpt":"We report the discovery of the first example of an Einstein zig-zag lens, an extremely rare lensing configuration. In this system, J1721+8842, six images of the same background quasar are formed by two intervening galaxies, one at redshift $z_1 = 0.184$ and a second one at $z_2 = 1.885$. Two out of the six multiple images are deflected in opposite directions as they pass the first lens galaxy on one side, and the second on the other side -- the optical paths forming zig-zags between the two deflectors. In this letter, we demonstrate that J1721+8842, previously thought to be a lensed dual quasa"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2411.04177","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2411.04177/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"2411.04177","created_at":"2026-07-05T10:19:30.729559+00:00"},{"alias_kind":"arxiv_version","alias_value":"2411.04177v1","created_at":"2026-07-05T10:19:30.729559+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2411.04177","created_at":"2026-07-05T10:19:30.729559+00:00"},{"alias_kind":"pith_short_12","alias_value":"M56HII6MFB66","created_at":"2026-07-05T10:19:30.729559+00:00"},{"alias_kind":"pith_short_16","alias_value":"M56HII6MFB66GWQY","created_at":"2026-07-05T10:19:30.729559+00:00"},{"alias_kind":"pith_short_8","alias_value":"M56HII6M","created_at":"2026-07-05T10:19:30.729559+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":0,"sample":[{"citing_arxiv_id":"2607.01005","citing_title":"Strong Lensing Tomography: Double and pseudo multi-source plane strong gravitational lensing to constrain dark energy","ref_index":24,"is_internal_anchor":false}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/M56HII6MFB66GWQYRJRJFMH4SA","json":"https://pith.science/pith/M56HII6MFB66GWQYRJRJFMH4SA.json","graph_json":"https://pith.science/api/pith-number/M56HII6MFB66GWQYRJRJFMH4SA/graph.json","events_json":"https://pith.science/api/pith-number/M56HII6MFB66GWQYRJRJFMH4SA/events.json","paper":"https://pith.science/paper/M56HII6M"},"agent_actions":{"view_html":"https://pith.science/pith/M56HII6MFB66GWQYRJRJFMH4SA","download_json":"https://pith.science/pith/M56HII6MFB66GWQYRJRJFMH4SA.json","view_paper":"https://pith.science/paper/M56HII6M","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2411.04177&json=true","fetch_graph":"https://pith.science/api/pith-number/M56HII6MFB66GWQYRJRJFMH4SA/graph.json","fetch_events":"https://pith.science/api/pith-number/M56HII6MFB66GWQYRJRJFMH4SA/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/M56HII6MFB66GWQYRJRJFMH4SA/action/timestamp_anchor","attest_storage":"https://pith.science/pith/M56HII6MFB66GWQYRJRJFMH4SA/action/storage_attestation","attest_author":"https://pith.science/pith/M56HII6MFB66GWQYRJRJFMH4SA/action/author_attestation","sign_citation":"https://pith.science/pith/M56HII6MFB66GWQYRJRJFMH4SA/action/citation_signature","submit_replication":"https://pith.science/pith/M56HII6MFB66GWQYRJRJFMH4SA/action/replication_record"}},"created_at":"2026-07-05T10:19:30.729559+00:00","updated_at":"2026-07-05T10:19:30.729559+00:00"}