{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2007:YFRRKNGWD2NHOKI4BQR4DWF7SJ","short_pith_number":"pith:YFRRKNGW","canonical_record":{"source":{"id":"0709.3643","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2007-09-23T14:21:13Z","cross_cats_sorted":[],"title_canon_sha256":"c3421fc7176f1330caad9b85c2488615af6fb837db601971b1cdfa5987e75d5b","abstract_canon_sha256":"a43d0495bd59fc17f2e451c5a5f126efe38cdf995a2f4df0d4ffe9976e188f20"},"schema_version":"1.0"},"canonical_sha256":"c1631534d61e9a77291c0c23c1d8bf9277fa6b5bbd27f31df0ae43ee0b67eb02","source":{"kind":"arxiv","id":"0709.3643","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0709.3643","created_at":"2026-05-18T00:14:48Z"},{"alias_kind":"arxiv_version","alias_value":"0709.3643v1","created_at":"2026-05-18T00:14:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0709.3643","created_at":"2026-05-18T00:14:48Z"},{"alias_kind":"pith_short_12","alias_value":"YFRRKNGWD2NH","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_16","alias_value":"YFRRKNGWD2NHOKI4","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_8","alias_value":"YFRRKNGW","created_at":"2026-05-18T12:25:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2007:YFRRKNGWD2NHOKI4BQR4DWF7SJ","target":"record","payload":{"canonical_record":{"source":{"id":"0709.3643","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2007-09-23T14:21:13Z","cross_cats_sorted":[],"title_canon_sha256":"c3421fc7176f1330caad9b85c2488615af6fb837db601971b1cdfa5987e75d5b","abstract_canon_sha256":"a43d0495bd59fc17f2e451c5a5f126efe38cdf995a2f4df0d4ffe9976e188f20"},"schema_version":"1.0"},"canonical_sha256":"c1631534d61e9a77291c0c23c1d8bf9277fa6b5bbd27f31df0ae43ee0b67eb02","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:14:48.086450Z","signature_b64":"r350ef1foo7xE4tlVQYkEOLWMMWPUS++zZjP5d4hg2AYZxZxV3N8tC7hqOHuQR9KTK++MGlwk4XFfH+K20ndBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c1631534d61e9a77291c0c23c1d8bf9277fa6b5bbd27f31df0ae43ee0b67eb02","last_reissued_at":"2026-05-18T00:14:48.085893Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:14:48.085893Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0709.3643","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":"2026-05-18T00:14:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Fqd2KJnOFxeWm9ip6hAldYGCZzJkplO3TBDmxaR3iVGWABZZpWcPN0RIKr+yvKp0wOUsrxtQREaBz5lrgcb1DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T20:15:18.308756Z"},"content_sha256":"7d2aff5e764c61966ab345598d9527f8b0c35d27c3591146975cb2cf45f4334b","schema_version":"1.0","event_id":"sha256:7d2aff5e764c61966ab345598d9527f8b0c35d27c3591146975cb2cf45f4334b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2007:YFRRKNGWD2NHOKI4BQR4DWF7SJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Broad Line Emission in Low-Metallicity Blue Compact Dwarf Galaxies: Evidence for Stellar Wind, Supernova and Possible AGN Activity","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"(2) University of Virginia, Charlottesville, Kyiv, N. G. Guseva (1) ((1) Main Astronomical Observatory, T. X. Thuan (2), Ukraine, USA), Y. I. Izotov (1)","submitted_at":"2007-09-23T14:21:13Z","abstract_excerpt":"We present spectra of a large sample of low-metallicity blue compact dwarf galaxies which exhibit broad components in their strong emission lines, mainly in Hbeta, [O III]4959, 5007 and Halpha. Twenty-three spectra have been obtained with the MMT, 14 of which show broad emission. The remaining 21 spectra with broad emission have been selected from the Data Release 5 of the Sloan Digital Sky Survey. The most plausible origin of broad line emission is the evolution of massive stars and their interaction with the circumstellar and interstellar medium. The broad emission with the lowest H$\\alpha$ "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0709.3643","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":"2026-05-18T00:14:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2s0lZXy9If/+vgd6BjdZOpzcupwmgyZutqAx9l0uHpQIV3L12Gc/5rcFRcvITnYv1uMV9hUj1YBx/J0YLEVEAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T20:15:18.309736Z"},"content_sha256":"d9c907d4f058866082caf85a600772e9abb12dc177f009440838db01ec0ab898","schema_version":"1.0","event_id":"sha256:d9c907d4f058866082caf85a600772e9abb12dc177f009440838db01ec0ab898"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YFRRKNGWD2NHOKI4BQR4DWF7SJ/bundle.json","state_url":"https://pith.science/pith/YFRRKNGWD2NHOKI4BQR4DWF7SJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YFRRKNGWD2NHOKI4BQR4DWF7SJ/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":"2026-05-27T20:15:18Z","links":{"resolver":"https://pith.science/pith/YFRRKNGWD2NHOKI4BQR4DWF7SJ","bundle":"https://pith.science/pith/YFRRKNGWD2NHOKI4BQR4DWF7SJ/bundle.json","state":"https://pith.science/pith/YFRRKNGWD2NHOKI4BQR4DWF7SJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YFRRKNGWD2NHOKI4BQR4DWF7SJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2007:YFRRKNGWD2NHOKI4BQR4DWF7SJ","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":"a43d0495bd59fc17f2e451c5a5f126efe38cdf995a2f4df0d4ffe9976e188f20","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2007-09-23T14:21:13Z","title_canon_sha256":"c3421fc7176f1330caad9b85c2488615af6fb837db601971b1cdfa5987e75d5b"},"schema_version":"1.0","source":{"id":"0709.3643","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0709.3643","created_at":"2026-05-18T00:14:48Z"},{"alias_kind":"arxiv_version","alias_value":"0709.3643v1","created_at":"2026-05-18T00:14:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0709.3643","created_at":"2026-05-18T00:14:48Z"},{"alias_kind":"pith_short_12","alias_value":"YFRRKNGWD2NH","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_16","alias_value":"YFRRKNGWD2NHOKI4","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_8","alias_value":"YFRRKNGW","created_at":"2026-05-18T12:25:56Z"}],"graph_snapshots":[{"event_id":"sha256:d9c907d4f058866082caf85a600772e9abb12dc177f009440838db01ec0ab898","target":"graph","created_at":"2026-05-18T00:14:48Z","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 present spectra of a large sample of low-metallicity blue compact dwarf galaxies which exhibit broad components in their strong emission lines, mainly in Hbeta, [O III]4959, 5007 and Halpha. Twenty-three spectra have been obtained with the MMT, 14 of which show broad emission. The remaining 21 spectra with broad emission have been selected from the Data Release 5 of the Sloan Digital Sky Survey. The most plausible origin of broad line emission is the evolution of massive stars and their interaction with the circumstellar and interstellar medium. The broad emission with the lowest H$\\alpha$ ","authors_text":"(2) University of Virginia, Charlottesville, Kyiv, N. G. Guseva (1) ((1) Main Astronomical Observatory, T. X. Thuan (2), Ukraine, USA), Y. I. Izotov (1)","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2007-09-23T14:21:13Z","title":"Broad Line Emission in Low-Metallicity Blue Compact Dwarf Galaxies: Evidence for Stellar Wind, Supernova and Possible AGN Activity"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0709.3643","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":"sha256:7d2aff5e764c61966ab345598d9527f8b0c35d27c3591146975cb2cf45f4334b","target":"record","created_at":"2026-05-18T00:14:48Z","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":"a43d0495bd59fc17f2e451c5a5f126efe38cdf995a2f4df0d4ffe9976e188f20","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2007-09-23T14:21:13Z","title_canon_sha256":"c3421fc7176f1330caad9b85c2488615af6fb837db601971b1cdfa5987e75d5b"},"schema_version":"1.0","source":{"id":"0709.3643","kind":"arxiv","version":1}},"canonical_sha256":"c1631534d61e9a77291c0c23c1d8bf9277fa6b5bbd27f31df0ae43ee0b67eb02","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c1631534d61e9a77291c0c23c1d8bf9277fa6b5bbd27f31df0ae43ee0b67eb02","first_computed_at":"2026-05-18T00:14:48.085893Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:14:48.085893Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"r350ef1foo7xE4tlVQYkEOLWMMWPUS++zZjP5d4hg2AYZxZxV3N8tC7hqOHuQR9KTK++MGlwk4XFfH+K20ndBg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:14:48.086450Z","signed_message":"canonical_sha256_bytes"},"source_id":"0709.3643","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7d2aff5e764c61966ab345598d9527f8b0c35d27c3591146975cb2cf45f4334b","sha256:d9c907d4f058866082caf85a600772e9abb12dc177f009440838db01ec0ab898"],"state_sha256":"1d4fa6e610925ce96516724cbf94612f17ce5a71a78ea8346549fdfc5ee5b87c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"t3Fi03z8u0oA1ISa0pJ4wg2yCeF23OcoyaFspwfs2nU3Dr/19SAhIxAXrPzWG8WPeTTOb7yuRV93GFVu0VQdAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T20:15:18.312348Z","bundle_sha256":"60e56b1fe51775069503543f7c3ed3c19dbf5b666961dcce8f8c03cde8ae1b5d"}}