{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:JJRVDVVQYO6RESEDWW3TFH6IE2","short_pith_number":"pith:JJRVDVVQ","canonical_record":{"source":{"id":"1203.1086","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-03-06T02:40:02Z","cross_cats_sorted":[],"title_canon_sha256":"39c98d280cb8c1132e428481445bde3dbb4d01370ab3b8b76b8df572d1233848","abstract_canon_sha256":"a5e8b7e3be9c28afb8776c2d639a5d2fe3657f47a7f4d2605189775a56c831a3"},"schema_version":"1.0"},"canonical_sha256":"4a6351d6b0c3bd124883b5b7329fc826abae57b13a444f9acb55c35865088134","source":{"kind":"arxiv","id":"1203.1086","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1203.1086","created_at":"2026-05-18T01:58:14Z"},{"alias_kind":"arxiv_version","alias_value":"1203.1086v1","created_at":"2026-05-18T01:58:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1203.1086","created_at":"2026-05-18T01:58:14Z"},{"alias_kind":"pith_short_12","alias_value":"JJRVDVVQYO6R","created_at":"2026-05-18T12:27:11Z"},{"alias_kind":"pith_short_16","alias_value":"JJRVDVVQYO6RESED","created_at":"2026-05-18T12:27:11Z"},{"alias_kind":"pith_short_8","alias_value":"JJRVDVVQ","created_at":"2026-05-18T12:27:11Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:JJRVDVVQYO6RESEDWW3TFH6IE2","target":"record","payload":{"canonical_record":{"source":{"id":"1203.1086","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-03-06T02:40:02Z","cross_cats_sorted":[],"title_canon_sha256":"39c98d280cb8c1132e428481445bde3dbb4d01370ab3b8b76b8df572d1233848","abstract_canon_sha256":"a5e8b7e3be9c28afb8776c2d639a5d2fe3657f47a7f4d2605189775a56c831a3"},"schema_version":"1.0"},"canonical_sha256":"4a6351d6b0c3bd124883b5b7329fc826abae57b13a444f9acb55c35865088134","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:58:14.523306Z","signature_b64":"3TM4KJ6dytUEnhH4PO09/mdtETn5M3sEKajV3Oh4OfYVy4509TUrSFWpVZ0nvrVBoZGV9aoQbVLT5GnCoziLDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4a6351d6b0c3bd124883b5b7329fc826abae57b13a444f9acb55c35865088134","last_reissued_at":"2026-05-18T01:58:14.522684Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:58:14.522684Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1203.1086","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":"2026-05-18T01:58:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VDq9oUQCCyaop5AtrGYEwfaiHAfwJ2Cb8g3RbFmRkMjSOm64kUAT5CgHhlC+Dksvx+1fCR62kF9nFdDH5T4QBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T06:20:49.884559Z"},"content_sha256":"ff4377d3ee06910fde68edbdfb990edc378127c3dd609d6488660fba13f443ea","schema_version":"1.0","event_id":"sha256:ff4377d3ee06910fde68edbdfb990edc378127c3dd609d6488660fba13f443ea"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:JJRVDVVQYO6RESEDWW3TFH6IE2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Nature of the UV/optical Emission of the Ultraluminous X-Ray Source in Holmberg II","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Fabien Gris\\'e, Hua Feng, Lian Tao, Philip Kaaret","submitted_at":"2012-03-06T02:40:02Z","abstract_excerpt":"We report on UV and X-ray spectroscopy and broad-band optical observations of the ultraluminous X-ray source in Holmberg II. Fitting various stellar spectral models to the combined, non-simultaneous data set, we find that normal metallicity stellar spectra are ruled out by the data, while low metallicity, Z = 0.1 Z_{\\odot}, late O-star spectra provide marginally acceptable fits, if we allow for the fact that X-ray ionization from the compact object may reduce or eliminate UV absorption/emission lines from the stellar wind. By contrast, an irradiated disk model fits both UV and optical data wit"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1203.1086","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":"2026-05-18T01:58:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"h2VQQoKWuBP14dF3NOJCpvEzhzPOQCtRacOIZ3AAEQ1k7cr6OXsjf8D/XnmCXt6CZ2/aFr12B2Jj4JMEb0WsAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T06:20:49.885208Z"},"content_sha256":"60f97dfb5bd2d75c0a04bb35ef018fcf14673047f17f474a26828dd9e07573ab","schema_version":"1.0","event_id":"sha256:60f97dfb5bd2d75c0a04bb35ef018fcf14673047f17f474a26828dd9e07573ab"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JJRVDVVQYO6RESEDWW3TFH6IE2/bundle.json","state_url":"https://pith.science/pith/JJRVDVVQYO6RESEDWW3TFH6IE2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JJRVDVVQYO6RESEDWW3TFH6IE2/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":"2026-06-09T06:20:49Z","links":{"resolver":"https://pith.science/pith/JJRVDVVQYO6RESEDWW3TFH6IE2","bundle":"https://pith.science/pith/JJRVDVVQYO6RESEDWW3TFH6IE2/bundle.json","state":"https://pith.science/pith/JJRVDVVQYO6RESEDWW3TFH6IE2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JJRVDVVQYO6RESEDWW3TFH6IE2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:JJRVDVVQYO6RESEDWW3TFH6IE2","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":"a5e8b7e3be9c28afb8776c2d639a5d2fe3657f47a7f4d2605189775a56c831a3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-03-06T02:40:02Z","title_canon_sha256":"39c98d280cb8c1132e428481445bde3dbb4d01370ab3b8b76b8df572d1233848"},"schema_version":"1.0","source":{"id":"1203.1086","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1203.1086","created_at":"2026-05-18T01:58:14Z"},{"alias_kind":"arxiv_version","alias_value":"1203.1086v1","created_at":"2026-05-18T01:58:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1203.1086","created_at":"2026-05-18T01:58:14Z"},{"alias_kind":"pith_short_12","alias_value":"JJRVDVVQYO6R","created_at":"2026-05-18T12:27:11Z"},{"alias_kind":"pith_short_16","alias_value":"JJRVDVVQYO6RESED","created_at":"2026-05-18T12:27:11Z"},{"alias_kind":"pith_short_8","alias_value":"JJRVDVVQ","created_at":"2026-05-18T12:27:11Z"}],"graph_snapshots":[{"event_id":"sha256:60f97dfb5bd2d75c0a04bb35ef018fcf14673047f17f474a26828dd9e07573ab","target":"graph","created_at":"2026-05-18T01:58:14Z","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 on UV and X-ray spectroscopy and broad-band optical observations of the ultraluminous X-ray source in Holmberg II. Fitting various stellar spectral models to the combined, non-simultaneous data set, we find that normal metallicity stellar spectra are ruled out by the data, while low metallicity, Z = 0.1 Z_{\\odot}, late O-star spectra provide marginally acceptable fits, if we allow for the fact that X-ray ionization from the compact object may reduce or eliminate UV absorption/emission lines from the stellar wind. By contrast, an irradiated disk model fits both UV and optical data wit","authors_text":"Fabien Gris\\'e, Hua Feng, Lian Tao, Philip Kaaret","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-03-06T02:40:02Z","title":"The Nature of the UV/optical Emission of the Ultraluminous X-Ray Source in Holmberg II"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1203.1086","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:ff4377d3ee06910fde68edbdfb990edc378127c3dd609d6488660fba13f443ea","target":"record","created_at":"2026-05-18T01:58:14Z","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":"a5e8b7e3be9c28afb8776c2d639a5d2fe3657f47a7f4d2605189775a56c831a3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-03-06T02:40:02Z","title_canon_sha256":"39c98d280cb8c1132e428481445bde3dbb4d01370ab3b8b76b8df572d1233848"},"schema_version":"1.0","source":{"id":"1203.1086","kind":"arxiv","version":1}},"canonical_sha256":"4a6351d6b0c3bd124883b5b7329fc826abae57b13a444f9acb55c35865088134","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4a6351d6b0c3bd124883b5b7329fc826abae57b13a444f9acb55c35865088134","first_computed_at":"2026-05-18T01:58:14.522684Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:58:14.522684Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"3TM4KJ6dytUEnhH4PO09/mdtETn5M3sEKajV3Oh4OfYVy4509TUrSFWpVZ0nvrVBoZGV9aoQbVLT5GnCoziLDg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:58:14.523306Z","signed_message":"canonical_sha256_bytes"},"source_id":"1203.1086","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ff4377d3ee06910fde68edbdfb990edc378127c3dd609d6488660fba13f443ea","sha256:60f97dfb5bd2d75c0a04bb35ef018fcf14673047f17f474a26828dd9e07573ab"],"state_sha256":"fd8f87f57b4ed787b420b2a561dc524d9245e503a4428fe67618ca0b813cb91d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GuNRrfGp0nrElfhbsgKZ57q0sHCyvBHmYjfOATk33uKgVzM5HP7v/rMsKU0AHk0jNqfPfahnv0wwb3fP6jueDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-09T06:20:49.888595Z","bundle_sha256":"00a332a3ef0be20828664c19a2856f2bc49e5add0cde0aef70c8b14c663f2210"}}