{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:TIPOH2OOZHXQUGOP4FRGQD3NOT","short_pith_number":"pith:TIPOH2OO","canonical_record":{"source":{"id":"1805.04317","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-05-11T10:50:11Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"58838c8f38cb715d82597eea03bffce079875a88d58df88a45eaeb1a6858b4eb","abstract_canon_sha256":"ae41cae0ff724d3ef611ab37de5a434306fd8c86dbf1b2e189a9ee13394d2f97"},"schema_version":"1.0"},"canonical_sha256":"9a1ee3e9cec9ef0a19cfe162680f6d74e42f53f46b01a3b52d9d4ee4a6d00838","source":{"kind":"arxiv","id":"1805.04317","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.04317","created_at":"2026-05-18T00:11:33Z"},{"alias_kind":"arxiv_version","alias_value":"1805.04317v1","created_at":"2026-05-18T00:11:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.04317","created_at":"2026-05-18T00:11:33Z"},{"alias_kind":"pith_short_12","alias_value":"TIPOH2OOZHXQ","created_at":"2026-05-18T12:32:53Z"},{"alias_kind":"pith_short_16","alias_value":"TIPOH2OOZHXQUGOP","created_at":"2026-05-18T12:32:53Z"},{"alias_kind":"pith_short_8","alias_value":"TIPOH2OO","created_at":"2026-05-18T12:32:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:TIPOH2OOZHXQUGOP4FRGQD3NOT","target":"record","payload":{"canonical_record":{"source":{"id":"1805.04317","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-05-11T10:50:11Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"58838c8f38cb715d82597eea03bffce079875a88d58df88a45eaeb1a6858b4eb","abstract_canon_sha256":"ae41cae0ff724d3ef611ab37de5a434306fd8c86dbf1b2e189a9ee13394d2f97"},"schema_version":"1.0"},"canonical_sha256":"9a1ee3e9cec9ef0a19cfe162680f6d74e42f53f46b01a3b52d9d4ee4a6d00838","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:11:33.865332Z","signature_b64":"2KCeHoyjzp6pKRdfSf5E26SimlQVBD1A8GhSQXyzKcW+g6XjYkZWuhsHRuw+HUDt4WLPVFwXGHhSzNXI2YHBCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9a1ee3e9cec9ef0a19cfe162680f6d74e42f53f46b01a3b52d9d4ee4a6d00838","last_reissued_at":"2026-05-18T00:11:33.864722Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:11:33.864722Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1805.04317","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:11:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BXMbuWwekKiWR/Eil/l0/87SkJTwUyWxv8F/T44EZ9bg7slbtuZ8KpWYW3U2OL6nP6MUC0kieF7ab9yBjL6eBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T08:23:36.215041Z"},"content_sha256":"cf2ab89354f4f4a248aea7fa1f713680acaf2f524f6f1984ec652e06b6d5563b","schema_version":"1.0","event_id":"sha256:cf2ab89354f4f4a248aea7fa1f713680acaf2f524f6f1984ec652e06b6d5563b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:TIPOH2OOZHXQUGOP4FRGQD3NOT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Discovery of the most ultra-luminous QSO using Gaia, SkyMapper and WISE","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.GA","authors_text":"Brian P. Schmidt, Christian Wolf, Christopher A. Onken, Fuyan Bian, John L. Tonry, Noura Alonzi, Patrick Tisserand, Wei Jeat Hon","submitted_at":"2018-05-11T10:50:11Z","abstract_excerpt":"We report the discovery of the ultra-luminous QSO SMSS~J215728.21-360215.1 with magnitude $z=16.9$ and W4$=7.42$ at redshift 4.75. Given absolute magnitudes of $M_{145,\\rm AB}=-29.3$, $M_{300,\\rm AB}=-30.12$ and $\\log L_{\\rm bol}/L_{\\rm bol,\\odot} = 14.84$, it is the QSO with the highest unlensed UV-optical luminosity currently known in the Universe. It was found by combining proper-motion data from Gaia DR2 with photometry from SkyMapper DR1 and the Wide-field Infrared Survey Explorer (WISE). In the Gaia database it is an isolated single source and thus unlikely to be strongly gravitationally"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.04317","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":""},"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:11:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/sNO1dNNTz8/daWkv6ysNbm2Ugik238Llq4XFLHtrnReE82AbmvrLIjBvPKN5s1aLok8fgXknr8C5bAI06z+AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T08:23:36.215397Z"},"content_sha256":"1619d03be80ebd900f35e88887d0d0d568f353178f85c31f74618ecd212358da","schema_version":"1.0","event_id":"sha256:1619d03be80ebd900f35e88887d0d0d568f353178f85c31f74618ecd212358da"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/TIPOH2OOZHXQUGOP4FRGQD3NOT/bundle.json","state_url":"https://pith.science/pith/TIPOH2OOZHXQUGOP4FRGQD3NOT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/TIPOH2OOZHXQUGOP4FRGQD3NOT/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-01T08:23:36Z","links":{"resolver":"https://pith.science/pith/TIPOH2OOZHXQUGOP4FRGQD3NOT","bundle":"https://pith.science/pith/TIPOH2OOZHXQUGOP4FRGQD3NOT/bundle.json","state":"https://pith.science/pith/TIPOH2OOZHXQUGOP4FRGQD3NOT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/TIPOH2OOZHXQUGOP4FRGQD3NOT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:TIPOH2OOZHXQUGOP4FRGQD3NOT","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":"ae41cae0ff724d3ef611ab37de5a434306fd8c86dbf1b2e189a9ee13394d2f97","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-05-11T10:50:11Z","title_canon_sha256":"58838c8f38cb715d82597eea03bffce079875a88d58df88a45eaeb1a6858b4eb"},"schema_version":"1.0","source":{"id":"1805.04317","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.04317","created_at":"2026-05-18T00:11:33Z"},{"alias_kind":"arxiv_version","alias_value":"1805.04317v1","created_at":"2026-05-18T00:11:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.04317","created_at":"2026-05-18T00:11:33Z"},{"alias_kind":"pith_short_12","alias_value":"TIPOH2OOZHXQ","created_at":"2026-05-18T12:32:53Z"},{"alias_kind":"pith_short_16","alias_value":"TIPOH2OOZHXQUGOP","created_at":"2026-05-18T12:32:53Z"},{"alias_kind":"pith_short_8","alias_value":"TIPOH2OO","created_at":"2026-05-18T12:32:53Z"}],"graph_snapshots":[{"event_id":"sha256:1619d03be80ebd900f35e88887d0d0d568f353178f85c31f74618ecd212358da","target":"graph","created_at":"2026-05-18T00:11:33Z","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":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We report the discovery of the ultra-luminous QSO SMSS~J215728.21-360215.1 with magnitude $z=16.9$ and W4$=7.42$ at redshift 4.75. Given absolute magnitudes of $M_{145,\\rm AB}=-29.3$, $M_{300,\\rm AB}=-30.12$ and $\\log L_{\\rm bol}/L_{\\rm bol,\\odot} = 14.84$, it is the QSO with the highest unlensed UV-optical luminosity currently known in the Universe. It was found by combining proper-motion data from Gaia DR2 with photometry from SkyMapper DR1 and the Wide-field Infrared Survey Explorer (WISE). In the Gaia database it is an isolated single source and thus unlikely to be strongly gravitationally","authors_text":"Brian P. Schmidt, Christian Wolf, Christopher A. Onken, Fuyan Bian, John L. Tonry, Noura Alonzi, Patrick Tisserand, Wei Jeat Hon","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-05-11T10:50:11Z","title":"Discovery of the most ultra-luminous QSO using Gaia, SkyMapper and WISE"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.04317","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:cf2ab89354f4f4a248aea7fa1f713680acaf2f524f6f1984ec652e06b6d5563b","target":"record","created_at":"2026-05-18T00:11:33Z","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":"ae41cae0ff724d3ef611ab37de5a434306fd8c86dbf1b2e189a9ee13394d2f97","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-05-11T10:50:11Z","title_canon_sha256":"58838c8f38cb715d82597eea03bffce079875a88d58df88a45eaeb1a6858b4eb"},"schema_version":"1.0","source":{"id":"1805.04317","kind":"arxiv","version":1}},"canonical_sha256":"9a1ee3e9cec9ef0a19cfe162680f6d74e42f53f46b01a3b52d9d4ee4a6d00838","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9a1ee3e9cec9ef0a19cfe162680f6d74e42f53f46b01a3b52d9d4ee4a6d00838","first_computed_at":"2026-05-18T00:11:33.864722Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:11:33.864722Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"2KCeHoyjzp6pKRdfSf5E26SimlQVBD1A8GhSQXyzKcW+g6XjYkZWuhsHRuw+HUDt4WLPVFwXGHhSzNXI2YHBCw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:11:33.865332Z","signed_message":"canonical_sha256_bytes"},"source_id":"1805.04317","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cf2ab89354f4f4a248aea7fa1f713680acaf2f524f6f1984ec652e06b6d5563b","sha256:1619d03be80ebd900f35e88887d0d0d568f353178f85c31f74618ecd212358da"],"state_sha256":"b24540e90492fc2565b78ccf0cc6780b85fa0bed04bdd7a5dee2e7135ef0e93c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Cju+1iGX//uV/vu1ENBYL1SVX8GP0hFPsCTBskmW7a1Vb+Iw3+4VrMACBa73bMuHdlb4qp3I2i+evPfC9YZJBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T08:23:36.217306Z","bundle_sha256":"ddac61ba9a19f4913831d0d02f235c540b6133126bf616dd5ccd59b27625f490"}}