{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:FYXU7LZDV7BLNT3HFWKCLROOOV","short_pith_number":"pith:FYXU7LZD","canonical_record":{"source":{"id":"1203.0215","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-03-01T15:33:44Z","cross_cats_sorted":[],"title_canon_sha256":"48e01bedf55e1f539840586e211daa4dd6114830c0066814dd07bf3c161bdbbd","abstract_canon_sha256":"eea1e0bfd007ac486a3a6de94d8ca42dedae4a37e2f5cbe634882a858155c78e"},"schema_version":"1.0"},"canonical_sha256":"2e2f4faf23afc2b6cf672d9425c5ce757b85dc1b622154f1ef539eb5fbc21806","source":{"kind":"arxiv","id":"1203.0215","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1203.0215","created_at":"2026-05-18T01:58:17Z"},{"alias_kind":"arxiv_version","alias_value":"1203.0215v2","created_at":"2026-05-18T01:58:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1203.0215","created_at":"2026-05-18T01:58:17Z"},{"alias_kind":"pith_short_12","alias_value":"FYXU7LZDV7BL","created_at":"2026-05-18T12:27:06Z"},{"alias_kind":"pith_short_16","alias_value":"FYXU7LZDV7BLNT3H","created_at":"2026-05-18T12:27:06Z"},{"alias_kind":"pith_short_8","alias_value":"FYXU7LZD","created_at":"2026-05-18T12:27:06Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:FYXU7LZDV7BLNT3HFWKCLROOOV","target":"record","payload":{"canonical_record":{"source":{"id":"1203.0215","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-03-01T15:33:44Z","cross_cats_sorted":[],"title_canon_sha256":"48e01bedf55e1f539840586e211daa4dd6114830c0066814dd07bf3c161bdbbd","abstract_canon_sha256":"eea1e0bfd007ac486a3a6de94d8ca42dedae4a37e2f5cbe634882a858155c78e"},"schema_version":"1.0"},"canonical_sha256":"2e2f4faf23afc2b6cf672d9425c5ce757b85dc1b622154f1ef539eb5fbc21806","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:58:17.802053Z","signature_b64":"qENM6jFgwDF92GWsxTYrQp/2vE5rZActpzgmrU7asm1mxljVBNhhQoUSviFVkQOHcKJmh6EAwSyfW5fRbcX4Bw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2e2f4faf23afc2b6cf672d9425c5ce757b85dc1b622154f1ef539eb5fbc21806","last_reissued_at":"2026-05-18T01:58:17.801539Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:58:17.801539Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1203.0215","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:58:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TQlyaGhvsiGgTU+UndJyItUoFvxyvchkA/7zWfdtkE1CSw1XXV3qsnVY03KbR0LNf7Lt139KTyEY9Nf0Q3gaCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T13:46:44.689576Z"},"content_sha256":"7aea24244a1f9f9938c572f70fe8795644ef3703330167bfe33620b026141f7e","schema_version":"1.0","event_id":"sha256:7aea24244a1f9f9938c572f70fe8795644ef3703330167bfe33620b026141f7e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:FYXU7LZDV7BLNT3HFWKCLROOOV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Unusual quasars from the Sloan Digital Sky Survey selected by means of Kohonen self-organising maps","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"A. de Hoon, A. in der Au, B. Kaminsky, H. Meusinger, M. Newholm, P. Schalldach, R.-D. Scholz","submitted_at":"2012-03-01T15:33:44Z","abstract_excerpt":"We exploit the spectral archive of the Sloan Digital Sky Survey (SDSS) Data Release 7 to select unusual quasar spectra. The selection method is based on a combination of the power of self-organising maps and the visual inspection of a huge number of spectra. Self-organising maps were applied to nearly 10^5 spectra classified as quasars by the SDSS pipeline. Particular attention was paid to minimise possible contamination by rare peculiar stellar spectral types. We present a catalogue of 1005 quasars with unusual spectra. This large sample provides a useful resource for both studying properties"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1203.0215","kind":"arxiv","version":2},"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":"2026-05-18T01:58:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"E7OkLwFP7yFfmKAe5MuEqxUGxt/rHJHTSAhrqjiRKzBpLqHTZ1YvdOZSbj+nx/mstXsUMj+T/t6snuLjZuqkDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T13:46:44.690307Z"},"content_sha256":"1ecdce1cf2eab499687cd2a584fda94eef52196e306fdc7977d6e1fed0b44505","schema_version":"1.0","event_id":"sha256:1ecdce1cf2eab499687cd2a584fda94eef52196e306fdc7977d6e1fed0b44505"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FYXU7LZDV7BLNT3HFWKCLROOOV/bundle.json","state_url":"https://pith.science/pith/FYXU7LZDV7BLNT3HFWKCLROOOV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FYXU7LZDV7BLNT3HFWKCLROOOV/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":"2026-05-26T13:46:44Z","links":{"resolver":"https://pith.science/pith/FYXU7LZDV7BLNT3HFWKCLROOOV","bundle":"https://pith.science/pith/FYXU7LZDV7BLNT3HFWKCLROOOV/bundle.json","state":"https://pith.science/pith/FYXU7LZDV7BLNT3HFWKCLROOOV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FYXU7LZDV7BLNT3HFWKCLROOOV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:FYXU7LZDV7BLNT3HFWKCLROOOV","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":"eea1e0bfd007ac486a3a6de94d8ca42dedae4a37e2f5cbe634882a858155c78e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-03-01T15:33:44Z","title_canon_sha256":"48e01bedf55e1f539840586e211daa4dd6114830c0066814dd07bf3c161bdbbd"},"schema_version":"1.0","source":{"id":"1203.0215","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1203.0215","created_at":"2026-05-18T01:58:17Z"},{"alias_kind":"arxiv_version","alias_value":"1203.0215v2","created_at":"2026-05-18T01:58:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1203.0215","created_at":"2026-05-18T01:58:17Z"},{"alias_kind":"pith_short_12","alias_value":"FYXU7LZDV7BL","created_at":"2026-05-18T12:27:06Z"},{"alias_kind":"pith_short_16","alias_value":"FYXU7LZDV7BLNT3H","created_at":"2026-05-18T12:27:06Z"},{"alias_kind":"pith_short_8","alias_value":"FYXU7LZD","created_at":"2026-05-18T12:27:06Z"}],"graph_snapshots":[{"event_id":"sha256:1ecdce1cf2eab499687cd2a584fda94eef52196e306fdc7977d6e1fed0b44505","target":"graph","created_at":"2026-05-18T01:58:17Z","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 exploit the spectral archive of the Sloan Digital Sky Survey (SDSS) Data Release 7 to select unusual quasar spectra. The selection method is based on a combination of the power of self-organising maps and the visual inspection of a huge number of spectra. Self-organising maps were applied to nearly 10^5 spectra classified as quasars by the SDSS pipeline. Particular attention was paid to minimise possible contamination by rare peculiar stellar spectral types. We present a catalogue of 1005 quasars with unusual spectra. This large sample provides a useful resource for both studying properties","authors_text":"A. de Hoon, A. in der Au, B. Kaminsky, H. Meusinger, M. Newholm, P. Schalldach, R.-D. Scholz","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-03-01T15:33:44Z","title":"Unusual quasars from the Sloan Digital Sky Survey selected by means of Kohonen self-organising maps"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1203.0215","kind":"arxiv","version":2},"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":"sha256:7aea24244a1f9f9938c572f70fe8795644ef3703330167bfe33620b026141f7e","target":"record","created_at":"2026-05-18T01:58:17Z","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":"eea1e0bfd007ac486a3a6de94d8ca42dedae4a37e2f5cbe634882a858155c78e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-03-01T15:33:44Z","title_canon_sha256":"48e01bedf55e1f539840586e211daa4dd6114830c0066814dd07bf3c161bdbbd"},"schema_version":"1.0","source":{"id":"1203.0215","kind":"arxiv","version":2}},"canonical_sha256":"2e2f4faf23afc2b6cf672d9425c5ce757b85dc1b622154f1ef539eb5fbc21806","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2e2f4faf23afc2b6cf672d9425c5ce757b85dc1b622154f1ef539eb5fbc21806","first_computed_at":"2026-05-18T01:58:17.801539Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:58:17.801539Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"qENM6jFgwDF92GWsxTYrQp/2vE5rZActpzgmrU7asm1mxljVBNhhQoUSviFVkQOHcKJmh6EAwSyfW5fRbcX4Bw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:58:17.802053Z","signed_message":"canonical_sha256_bytes"},"source_id":"1203.0215","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7aea24244a1f9f9938c572f70fe8795644ef3703330167bfe33620b026141f7e","sha256:1ecdce1cf2eab499687cd2a584fda94eef52196e306fdc7977d6e1fed0b44505"],"state_sha256":"3a3e3a20970cc7b6a2453ed07b2a0b0dfbe71422337b83a2b15311595d97e19f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WJTdjQTx1urfw8oJkoWXIlvdy/I/8hIl/0caw6r0Ld+gpp+8HmI1EgvATsnv7vucEAVf9Xs+VEPqiiqjQNc+CQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T13:46:44.693983Z","bundle_sha256":"a020742e5ae25ea4a49d20a21648a626cf8fe3e8d8501dec1295011340a1da07"}}