{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2007:OMERBXNPMIRRG76WIXK4P2EEOT","short_pith_number":"pith:OMERBXNP","canonical_record":{"source":{"id":"astro-ph/0702358","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2007-02-13T21:24:53Z","cross_cats_sorted":[],"title_canon_sha256":"9fa2b05fe1d4e4319cbf8b2b850a0b9491b000d0ba6734bba0987aeb027456c0","abstract_canon_sha256":"fae58f17d0dfc3557db4e9b589ac60bd0c86618b64876dd7a89952d0f1e328dd"},"schema_version":"1.0"},"canonical_sha256":"730910ddaf6223137fd645d5c7e88474d397d157367918521caf58ff2bb04638","source":{"kind":"arxiv","id":"astro-ph/0702358","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0702358","created_at":"2026-05-18T04:29:06Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0702358v1","created_at":"2026-05-18T04:29:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0702358","created_at":"2026-05-18T04:29:06Z"},{"alias_kind":"pith_short_12","alias_value":"OMERBXNPMIRR","created_at":"2026-05-18T12:25:55Z"},{"alias_kind":"pith_short_16","alias_value":"OMERBXNPMIRRG76W","created_at":"2026-05-18T12:25:55Z"},{"alias_kind":"pith_short_8","alias_value":"OMERBXNP","created_at":"2026-05-18T12:25:55Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2007:OMERBXNPMIRRG76WIXK4P2EEOT","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0702358","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2007-02-13T21:24:53Z","cross_cats_sorted":[],"title_canon_sha256":"9fa2b05fe1d4e4319cbf8b2b850a0b9491b000d0ba6734bba0987aeb027456c0","abstract_canon_sha256":"fae58f17d0dfc3557db4e9b589ac60bd0c86618b64876dd7a89952d0f1e328dd"},"schema_version":"1.0"},"canonical_sha256":"730910ddaf6223137fd645d5c7e88474d397d157367918521caf58ff2bb04638","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:29:06.558379Z","signature_b64":"7v6foAow87nk/Nc4cOKDHVKl7l5GU+OwhWaQugA5bXMa4nmNn6tXAeFuvFIKRswt9Rxp6ERmM2XXzAitmP2gBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"730910ddaf6223137fd645d5c7e88474d397d157367918521caf58ff2bb04638","last_reissued_at":"2026-05-18T04:29:06.557931Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:29:06.557931Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0702358","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":"2026-05-18T04:29:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UJp+KLwFfR0+mtr9ZPWGj9w5ZeaaSNmPh0d4QaKYFNOgKwQgbzfdwWZ8yxK5gXSfPjclJwuf4cQFUNsUZxo4AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T08:31:51.005231Z"},"content_sha256":"ac7deac91aad1f0be3753efc6594c0945c7801b187e15dca997aba90c319595a","schema_version":"1.0","event_id":"sha256:ac7deac91aad1f0be3753efc6594c0945c7801b187e15dca997aba90c319595a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2007:OMERBXNPMIRRG76WIXK4P2EEOT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Energy distribution of individual quasars from far-UV to X-rays: I. Intrinsic UV hardness and dust opacities","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Andrew Humphrey, Erika Benitez, Fabrizio Nicastro, Luc Binette, Mario Rodriguez-Martinez, Sinhue A. R. Haro-Corzo, Yair Krongold","submitted_at":"2007-02-13T21:24:53Z","abstract_excerpt":"Using Chandra and HST archival data, we have studied the individual Spectral Energy Distribution (SED) of 11 quasars. All UV spectra show a spectral break around 1100A. 5 X-ray spectra show the presence of a ``soft excess'' and 7 spectra showed an intrinsic absorption. We found that for most quasars a simple extrapolation of the far-UV powerlaw into the X-ray domain generally lies below the X-ray data and that the big blue bump and the soft X-ray excess do not share a common physical origin. We explore the issue of whether the observed SED might be dust absorbed in the far and near-UV. We fit "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0702358","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":"2026-05-18T04:29:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"38R45uD3E+Gqc9jBud8SVeAAvfbIyHV9nMAMN2K36bgJLg7pPtbrs1FomRPgBjMEEza2BVeIIRRcPr+D3sNKDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T08:31:51.005744Z"},"content_sha256":"41f5cf878f0da35549861cdc7337912cb73e083fe774fbb9146220d583afb339","schema_version":"1.0","event_id":"sha256:41f5cf878f0da35549861cdc7337912cb73e083fe774fbb9146220d583afb339"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OMERBXNPMIRRG76WIXK4P2EEOT/bundle.json","state_url":"https://pith.science/pith/OMERBXNPMIRRG76WIXK4P2EEOT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OMERBXNPMIRRG76WIXK4P2EEOT/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":"2026-05-26T08:31:51Z","links":{"resolver":"https://pith.science/pith/OMERBXNPMIRRG76WIXK4P2EEOT","bundle":"https://pith.science/pith/OMERBXNPMIRRG76WIXK4P2EEOT/bundle.json","state":"https://pith.science/pith/OMERBXNPMIRRG76WIXK4P2EEOT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OMERBXNPMIRRG76WIXK4P2EEOT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2007:OMERBXNPMIRRG76WIXK4P2EEOT","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":"fae58f17d0dfc3557db4e9b589ac60bd0c86618b64876dd7a89952d0f1e328dd","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2007-02-13T21:24:53Z","title_canon_sha256":"9fa2b05fe1d4e4319cbf8b2b850a0b9491b000d0ba6734bba0987aeb027456c0"},"schema_version":"1.0","source":{"id":"astro-ph/0702358","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0702358","created_at":"2026-05-18T04:29:06Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0702358v1","created_at":"2026-05-18T04:29:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0702358","created_at":"2026-05-18T04:29:06Z"},{"alias_kind":"pith_short_12","alias_value":"OMERBXNPMIRR","created_at":"2026-05-18T12:25:55Z"},{"alias_kind":"pith_short_16","alias_value":"OMERBXNPMIRRG76W","created_at":"2026-05-18T12:25:55Z"},{"alias_kind":"pith_short_8","alias_value":"OMERBXNP","created_at":"2026-05-18T12:25:55Z"}],"graph_snapshots":[{"event_id":"sha256:41f5cf878f0da35549861cdc7337912cb73e083fe774fbb9146220d583afb339","target":"graph","created_at":"2026-05-18T04:29:06Z","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":"Using Chandra and HST archival data, we have studied the individual Spectral Energy Distribution (SED) of 11 quasars. All UV spectra show a spectral break around 1100A. 5 X-ray spectra show the presence of a ``soft excess'' and 7 spectra showed an intrinsic absorption. We found that for most quasars a simple extrapolation of the far-UV powerlaw into the X-ray domain generally lies below the X-ray data and that the big blue bump and the soft X-ray excess do not share a common physical origin. We explore the issue of whether the observed SED might be dust absorbed in the far and near-UV. We fit ","authors_text":"Andrew Humphrey, Erika Benitez, Fabrizio Nicastro, Luc Binette, Mario Rodriguez-Martinez, Sinhue A. R. Haro-Corzo, Yair Krongold","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2007-02-13T21:24:53Z","title":"Energy distribution of individual quasars from far-UV to X-rays: I. Intrinsic UV hardness and dust opacities"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0702358","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:ac7deac91aad1f0be3753efc6594c0945c7801b187e15dca997aba90c319595a","target":"record","created_at":"2026-05-18T04:29:06Z","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":"fae58f17d0dfc3557db4e9b589ac60bd0c86618b64876dd7a89952d0f1e328dd","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2007-02-13T21:24:53Z","title_canon_sha256":"9fa2b05fe1d4e4319cbf8b2b850a0b9491b000d0ba6734bba0987aeb027456c0"},"schema_version":"1.0","source":{"id":"astro-ph/0702358","kind":"arxiv","version":1}},"canonical_sha256":"730910ddaf6223137fd645d5c7e88474d397d157367918521caf58ff2bb04638","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"730910ddaf6223137fd645d5c7e88474d397d157367918521caf58ff2bb04638","first_computed_at":"2026-05-18T04:29:06.557931Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:29:06.557931Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"7v6foAow87nk/Nc4cOKDHVKl7l5GU+OwhWaQugA5bXMa4nmNn6tXAeFuvFIKRswt9Rxp6ERmM2XXzAitmP2gBw==","signature_status":"signed_v1","signed_at":"2026-05-18T04:29:06.558379Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0702358","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ac7deac91aad1f0be3753efc6594c0945c7801b187e15dca997aba90c319595a","sha256:41f5cf878f0da35549861cdc7337912cb73e083fe774fbb9146220d583afb339"],"state_sha256":"26e7c904815654558572354f3a8271d00c7e2294c0b423920a7dca8fa1e2ec94"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"p6sW3YvY3mGAGmqlbkzydCBVz0XR+pjWGgQ5YfLLCC3Vpaz1/Go1WuKHwKStj7P/fvM5nW7NzUJxh/AW/XzTAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T08:31:51.009456Z","bundle_sha256":"ba724ac31c2c28fdf67e49aa860f8bb1abc2031063b855d73b763c97f7608a5d"}}