{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1999:7UYH46TGG3KOJJFI3A5X47RI2L","short_pith_number":"pith:7UYH46TG","canonical_record":{"source":{"id":"astro-ph/9902043","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1999-02-02T21:16:39Z","cross_cats_sorted":[],"title_canon_sha256":"8b34e8cceac0202dbab093653766d2330f67a761a0b8c075137491a4be566853","abstract_canon_sha256":"bacb1cdbf50b938227852d281514baaeb811cf5cb960e8f73fd43cbe692393b9"},"schema_version":"1.0"},"canonical_sha256":"fd307e7a6636d4e4a4a8d83b7e7e28d2f3c7a19dab17e24bf5033534cae121d5","source":{"kind":"arxiv","id":"astro-ph/9902043","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9902043","created_at":"2026-05-18T01:07:36Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9902043v1","created_at":"2026-05-18T01:07:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9902043","created_at":"2026-05-18T01:07:36Z"},{"alias_kind":"pith_short_12","alias_value":"7UYH46TGG3KO","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_16","alias_value":"7UYH46TGG3KOJJFI","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_8","alias_value":"7UYH46TG","created_at":"2026-05-18T12:25:49Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1999:7UYH46TGG3KOJJFI3A5X47RI2L","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/9902043","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1999-02-02T21:16:39Z","cross_cats_sorted":[],"title_canon_sha256":"8b34e8cceac0202dbab093653766d2330f67a761a0b8c075137491a4be566853","abstract_canon_sha256":"bacb1cdbf50b938227852d281514baaeb811cf5cb960e8f73fd43cbe692393b9"},"schema_version":"1.0"},"canonical_sha256":"fd307e7a6636d4e4a4a8d83b7e7e28d2f3c7a19dab17e24bf5033534cae121d5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:07:36.621081Z","signature_b64":"/+Hs6P7nsqa2PARjbhW/Z8bLdCbC1ql4L5FWSXJZu5zpQCh0AVGtCnfNtbCsPxBuXHhgP9QxXLcgkwuszxVIBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fd307e7a6636d4e4a4a8d83b7e7e28d2f3c7a19dab17e24bf5033534cae121d5","last_reissued_at":"2026-05-18T01:07:36.620514Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:07:36.620514Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/9902043","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":"2026-05-18T01:07:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VLgJSSFOduzg9pvslccEEovx68wJuCuKdVHy0wrZbGVVDVu1ANdzLsVWZ7WTDINZJRzNcUs4/6eqVd2eWdoyDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T15:44:27.920468Z"},"content_sha256":"469314b15a5440a5cda73119883964e56e5d6170c0e2f2f1d9bd7e4166001cc3","schema_version":"1.0","event_id":"sha256:469314b15a5440a5cda73119883964e56e5d6170c0e2f2f1d9bd7e4166001cc3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1999:7UYH46TGG3KOJJFI3A5X47RI2L","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Dusty Starburst Nucleus of M33","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"G. C. Clayton, G. H. Rieke, & K. A. Misselt, K. D. Gordon, M. M. Hanson","submitted_at":"1999-02-02T21:16:39Z","abstract_excerpt":"We have thoroughly characterized the ultraviolet to near-infrared (0.15 - 2.2 micron) spectral energy distribution (SED) of the central parsec of the M33 nucleus through new infrared photometry and optical/near-infrared spectroscopy, combined with ultraviolet/optical observations from the literature and the HST archive. The SED shows evidence for a significant level of attenuation, which we model through a Monte Carlo radiative transfer code as a shell of clumpy Milky Way-type dust (tau_V ~ 2 +/- 1). The discovery of Milky Way-type dust (with a strong 2175 A bump) internal to the M33 nucleus i"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9902043","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":"2026-05-18T01:07:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mGnY53HyHP0w6HOFdgjtNdYfkGor3Mw8UnbAe8zEh318CNMYp9dtYCMjf1vLpbzkZpZZ1+TIWIaAc2l/NEUqAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T15:44:27.921082Z"},"content_sha256":"54f37f23c863a41e7860d977c8c1193964f34557e5fa5490b7ee3046f0f2dc0b","schema_version":"1.0","event_id":"sha256:54f37f23c863a41e7860d977c8c1193964f34557e5fa5490b7ee3046f0f2dc0b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7UYH46TGG3KOJJFI3A5X47RI2L/bundle.json","state_url":"https://pith.science/pith/7UYH46TGG3KOJJFI3A5X47RI2L/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7UYH46TGG3KOJJFI3A5X47RI2L/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":"2026-06-07T15:44:27Z","links":{"resolver":"https://pith.science/pith/7UYH46TGG3KOJJFI3A5X47RI2L","bundle":"https://pith.science/pith/7UYH46TGG3KOJJFI3A5X47RI2L/bundle.json","state":"https://pith.science/pith/7UYH46TGG3KOJJFI3A5X47RI2L/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7UYH46TGG3KOJJFI3A5X47RI2L/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1999:7UYH46TGG3KOJJFI3A5X47RI2L","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":"bacb1cdbf50b938227852d281514baaeb811cf5cb960e8f73fd43cbe692393b9","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1999-02-02T21:16:39Z","title_canon_sha256":"8b34e8cceac0202dbab093653766d2330f67a761a0b8c075137491a4be566853"},"schema_version":"1.0","source":{"id":"astro-ph/9902043","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9902043","created_at":"2026-05-18T01:07:36Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9902043v1","created_at":"2026-05-18T01:07:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9902043","created_at":"2026-05-18T01:07:36Z"},{"alias_kind":"pith_short_12","alias_value":"7UYH46TGG3KO","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_16","alias_value":"7UYH46TGG3KOJJFI","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_8","alias_value":"7UYH46TG","created_at":"2026-05-18T12:25:49Z"}],"graph_snapshots":[{"event_id":"sha256:54f37f23c863a41e7860d977c8c1193964f34557e5fa5490b7ee3046f0f2dc0b","target":"graph","created_at":"2026-05-18T01:07:36Z","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 have thoroughly characterized the ultraviolet to near-infrared (0.15 - 2.2 micron) spectral energy distribution (SED) of the central parsec of the M33 nucleus through new infrared photometry and optical/near-infrared spectroscopy, combined with ultraviolet/optical observations from the literature and the HST archive. The SED shows evidence for a significant level of attenuation, which we model through a Monte Carlo radiative transfer code as a shell of clumpy Milky Way-type dust (tau_V ~ 2 +/- 1). The discovery of Milky Way-type dust (with a strong 2175 A bump) internal to the M33 nucleus i","authors_text":"G. C. Clayton, G. H. Rieke, & K. A. Misselt, K. D. Gordon, M. M. Hanson","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"1999-02-02T21:16:39Z","title":"The Dusty Starburst Nucleus of M33"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9902043","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":"sha256:469314b15a5440a5cda73119883964e56e5d6170c0e2f2f1d9bd7e4166001cc3","target":"record","created_at":"2026-05-18T01:07:36Z","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":"bacb1cdbf50b938227852d281514baaeb811cf5cb960e8f73fd43cbe692393b9","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1999-02-02T21:16:39Z","title_canon_sha256":"8b34e8cceac0202dbab093653766d2330f67a761a0b8c075137491a4be566853"},"schema_version":"1.0","source":{"id":"astro-ph/9902043","kind":"arxiv","version":1}},"canonical_sha256":"fd307e7a6636d4e4a4a8d83b7e7e28d2f3c7a19dab17e24bf5033534cae121d5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fd307e7a6636d4e4a4a8d83b7e7e28d2f3c7a19dab17e24bf5033534cae121d5","first_computed_at":"2026-05-18T01:07:36.620514Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:07:36.620514Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/+Hs6P7nsqa2PARjbhW/Z8bLdCbC1ql4L5FWSXJZu5zpQCh0AVGtCnfNtbCsPxBuXHhgP9QxXLcgkwuszxVIBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:07:36.621081Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/9902043","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:469314b15a5440a5cda73119883964e56e5d6170c0e2f2f1d9bd7e4166001cc3","sha256:54f37f23c863a41e7860d977c8c1193964f34557e5fa5490b7ee3046f0f2dc0b"],"state_sha256":"283dc37284fb87611221b023013f722efa892181fc9ddc40c06b3726957b4ff6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Kl8y21FrTZ7c/V7b1G185SStHSUb+JqVIytOimyNfTJl7HWVFPVPmkuTRUb4sBnT0gujRlLpOK4ssiA6K5CWCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-07T15:44:27.924271Z","bundle_sha256":"a549d28a8797aadbafef28a5039fe904785e3cceb76969bfce72cfccd3064a8e"}}