{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2001:GV6NBDXO6KHKRA4XH4J2K75IEN","short_pith_number":"pith:GV6NBDXO","canonical_record":{"source":{"id":"astro-ph/0109013","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2001-09-03T08:28:41Z","cross_cats_sorted":[],"title_canon_sha256":"db7567b2da575f623c07c7698b523f1cc431386b6a4a422c1769099d4ca0d1df","abstract_canon_sha256":"a3339ef3dc502a893f577c62587f82ae9b08ddd51e156fd64db44e6a3d3f6753"},"schema_version":"1.0"},"canonical_sha256":"357cd08eeef28ea883973f13a57fa823577c383a0f70f39a78311645391aabed","source":{"kind":"arxiv","id":"astro-ph/0109013","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0109013","created_at":"2026-05-18T01:07:45Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0109013v1","created_at":"2026-05-18T01:07:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0109013","created_at":"2026-05-18T01:07:45Z"},{"alias_kind":"pith_short_12","alias_value":"GV6NBDXO6KHK","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_16","alias_value":"GV6NBDXO6KHKRA4X","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_8","alias_value":"GV6NBDXO","created_at":"2026-05-18T12:25:50Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2001:GV6NBDXO6KHKRA4XH4J2K75IEN","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0109013","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2001-09-03T08:28:41Z","cross_cats_sorted":[],"title_canon_sha256":"db7567b2da575f623c07c7698b523f1cc431386b6a4a422c1769099d4ca0d1df","abstract_canon_sha256":"a3339ef3dc502a893f577c62587f82ae9b08ddd51e156fd64db44e6a3d3f6753"},"schema_version":"1.0"},"canonical_sha256":"357cd08eeef28ea883973f13a57fa823577c383a0f70f39a78311645391aabed","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:07:45.552839Z","signature_b64":"Itak5mqfkP9s1hOyEl30kXrxY2JE0fP+LPJTV4ayGO9gbkuXeTcYuAvCIs8hKFX+vBRqU1eh5kxRfZbzgMLCBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"357cd08eeef28ea883973f13a57fa823577c383a0f70f39a78311645391aabed","last_reissued_at":"2026-05-18T01:07:45.552436Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:07:45.552436Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0109013","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":"2026-05-18T01:07:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BQ01qxtYI4hym0BM2xDsZ02ISVoDn0zeKqUc3UIEZHcpff1A2cChEYAeVzR7evXy82i9etT6GkqnOlEhfeqJAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T23:18:32.281341Z"},"content_sha256":"deb57768eb777f380440922cc601c60f7e052c1e56c49648ecf31912761a4fb5","schema_version":"1.0","event_id":"sha256:deb57768eb777f380440922cc601c60f7e052c1e56c49648ecf31912761a4fb5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2001:GV6NBDXO6KHKRA4XH4J2K75IEN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Dust Absorption and the Cosmic UV Flux Density","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. Buzzoni (TNG, A. Iovino (Oss. Astron. Brera), M. Massarotti (Oss. Astron. Capodimonte), Oss. Astron. Brera)","submitted_at":"2001-09-03T08:28:41Z","abstract_excerpt":"We study the evolution of the galaxy UV luminosity density as a function of redshift in the Hubble Deep Field North (HDF-N). We estimate the amount of energy absorbed by dust and hidden from optical observations by analyzing the HDF-N photometric data with the spectral energy distribution fitting method. According to our results, at redshifts 1 < z < 4.5, the global energy observed in the UV rest-frame at lambda=1500 A corresponds to only 7-11% of the stellar energy output, the rest of it being absorbed by dust and re-emitted in the far-IR. Our estimates of the comoving star formation rate den"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0109013","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":"2026-05-18T01:07:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"S1PH/ySoXWgRgN91Bd3l9vQJpjH7irhPM0kRMuhBZcDaFPwZ7cAxDMEfEY8N2oGuMlVFuJvSQNjThYONspKNBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T23:18:32.281696Z"},"content_sha256":"72650133a7802c0a3aad852368f16956497dc61977f7e49380155197ecb628f0","schema_version":"1.0","event_id":"sha256:72650133a7802c0a3aad852368f16956497dc61977f7e49380155197ecb628f0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GV6NBDXO6KHKRA4XH4J2K75IEN/bundle.json","state_url":"https://pith.science/pith/GV6NBDXO6KHKRA4XH4J2K75IEN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GV6NBDXO6KHKRA4XH4J2K75IEN/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":"2026-06-08T23:18:32Z","links":{"resolver":"https://pith.science/pith/GV6NBDXO6KHKRA4XH4J2K75IEN","bundle":"https://pith.science/pith/GV6NBDXO6KHKRA4XH4J2K75IEN/bundle.json","state":"https://pith.science/pith/GV6NBDXO6KHKRA4XH4J2K75IEN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GV6NBDXO6KHKRA4XH4J2K75IEN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2001:GV6NBDXO6KHKRA4XH4J2K75IEN","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":"a3339ef3dc502a893f577c62587f82ae9b08ddd51e156fd64db44e6a3d3f6753","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2001-09-03T08:28:41Z","title_canon_sha256":"db7567b2da575f623c07c7698b523f1cc431386b6a4a422c1769099d4ca0d1df"},"schema_version":"1.0","source":{"id":"astro-ph/0109013","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0109013","created_at":"2026-05-18T01:07:45Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0109013v1","created_at":"2026-05-18T01:07:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0109013","created_at":"2026-05-18T01:07:45Z"},{"alias_kind":"pith_short_12","alias_value":"GV6NBDXO6KHK","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_16","alias_value":"GV6NBDXO6KHKRA4X","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_8","alias_value":"GV6NBDXO","created_at":"2026-05-18T12:25:50Z"}],"graph_snapshots":[{"event_id":"sha256:72650133a7802c0a3aad852368f16956497dc61977f7e49380155197ecb628f0","target":"graph","created_at":"2026-05-18T01:07:45Z","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 study the evolution of the galaxy UV luminosity density as a function of redshift in the Hubble Deep Field North (HDF-N). We estimate the amount of energy absorbed by dust and hidden from optical observations by analyzing the HDF-N photometric data with the spectral energy distribution fitting method. According to our results, at redshifts 1 < z < 4.5, the global energy observed in the UV rest-frame at lambda=1500 A corresponds to only 7-11% of the stellar energy output, the rest of it being absorbed by dust and re-emitted in the far-IR. Our estimates of the comoving star formation rate den","authors_text":"A. Buzzoni (TNG, A. Iovino (Oss. Astron. Brera), M. Massarotti (Oss. Astron. Capodimonte), Oss. Astron. Brera)","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2001-09-03T08:28:41Z","title":"Dust Absorption and the Cosmic UV Flux Density"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0109013","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:deb57768eb777f380440922cc601c60f7e052c1e56c49648ecf31912761a4fb5","target":"record","created_at":"2026-05-18T01:07:45Z","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":"a3339ef3dc502a893f577c62587f82ae9b08ddd51e156fd64db44e6a3d3f6753","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2001-09-03T08:28:41Z","title_canon_sha256":"db7567b2da575f623c07c7698b523f1cc431386b6a4a422c1769099d4ca0d1df"},"schema_version":"1.0","source":{"id":"astro-ph/0109013","kind":"arxiv","version":1}},"canonical_sha256":"357cd08eeef28ea883973f13a57fa823577c383a0f70f39a78311645391aabed","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"357cd08eeef28ea883973f13a57fa823577c383a0f70f39a78311645391aabed","first_computed_at":"2026-05-18T01:07:45.552436Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:07:45.552436Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Itak5mqfkP9s1hOyEl30kXrxY2JE0fP+LPJTV4ayGO9gbkuXeTcYuAvCIs8hKFX+vBRqU1eh5kxRfZbzgMLCBw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:07:45.552839Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0109013","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:deb57768eb777f380440922cc601c60f7e052c1e56c49648ecf31912761a4fb5","sha256:72650133a7802c0a3aad852368f16956497dc61977f7e49380155197ecb628f0"],"state_sha256":"4e634d8a4474b9f930e23553667089839064f60ea7ecc179424499d3d2d489bd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RidEFJLUBQ9igRxrBsXXT4Yo5caCU99GlwCuXuvMa+geQ4cmofoE0r91qNCdTfuA8KkQdHV6ynmPMxWjofw1BA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-08T23:18:32.283652Z","bundle_sha256":"a32697a781eca18c8f50cbb6f128c148f8a755f7e7a1f2cbbe54af1eb33b661c"}}