{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2007:XCMQJY3PYT26D4OCJH3EZO7DBO","short_pith_number":"pith:XCMQJY3P","canonical_record":{"source":{"id":"astro-ph/0703351","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2007-03-14T09:44:02Z","cross_cats_sorted":[],"title_canon_sha256":"5f8aec2a718231dab40c84f244602fcdfbfbe6c8b6cb4b6cc0f1716044ce4fed","abstract_canon_sha256":"7e30a04b9e835c661e8c49a4316126239ce75ad0e833e1ee2af40acef1e2295a"},"schema_version":"1.0"},"canonical_sha256":"b89904e36fc4f5e1f1c249f64cbbe30bb98585a08d56d80751b683f6a6178880","source":{"kind":"arxiv","id":"astro-ph/0703351","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0703351","created_at":"2026-05-18T04:29:05Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0703351v1","created_at":"2026-05-18T04:29:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0703351","created_at":"2026-05-18T04:29:05Z"},{"alias_kind":"pith_short_12","alias_value":"XCMQJY3PYT26","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_16","alias_value":"XCMQJY3PYT26D4OC","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_8","alias_value":"XCMQJY3P","created_at":"2026-05-18T12:25:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2007:XCMQJY3PYT26D4OCJH3EZO7DBO","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0703351","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2007-03-14T09:44:02Z","cross_cats_sorted":[],"title_canon_sha256":"5f8aec2a718231dab40c84f244602fcdfbfbe6c8b6cb4b6cc0f1716044ce4fed","abstract_canon_sha256":"7e30a04b9e835c661e8c49a4316126239ce75ad0e833e1ee2af40acef1e2295a"},"schema_version":"1.0"},"canonical_sha256":"b89904e36fc4f5e1f1c249f64cbbe30bb98585a08d56d80751b683f6a6178880","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:29:05.657932Z","signature_b64":"ExVLET/ZGtpeK2a0J0jPynUaHSDxW3bHo+rjAbZNvDsqQ4Z/tleJPKTYMpTwsoXwlzY1lymEI9YpLZhVCnwkBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b89904e36fc4f5e1f1c249f64cbbe30bb98585a08d56d80751b683f6a6178880","last_reissued_at":"2026-05-18T04:29:05.657344Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:29:05.657344Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0703351","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":"2026-05-18T04:29:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RtvUr/tvZV0tLbPcB0BhFalP50W37/A5vPO4muQOCl7/ALv3bVkDur0VQ9ktN72CY1IRWHMr3DNtMxFqYWI6DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T14:32:34.850243Z"},"content_sha256":"d9e49168b119a2af70df3f4e5b9e03514445105194d29b808ca03e904002e9de","schema_version":"1.0","event_id":"sha256:d9e49168b119a2af70df3f4e5b9e03514445105194d29b808ca03e904002e9de"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2007:XCMQJY3PYT26D4OCJH3EZO7DBO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Absorption Measure Distribution of the Outflow in IRAS 13349+2438: Direct Observation of Thermal Instability?","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Ehud Behar, Shai Kaspi, Tomer Holczer","submitted_at":"2007-03-14T09:44:02Z","abstract_excerpt":"We analyze the Chandra X-ray spectrum obtained with the HETGS grating spectrometer of IRAS 13349+2438, which has one of the richest absorption spectra of a quasar outflow. Absorption from almost all charge states of Fe is detected. This allows for a detailed reconstruction of the absorption measure distribution (AMD), which we define as the continuous distribution of column density as a function of ionization parameter. We find a double peaked AMD for IRAS 13349+2438 with a total (ionized) column density of N_H = (1.2 +- 0.3)* 10^{22} cm^-2} assuming solar iron abundance. For comparison, we pe"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0703351","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":"2026-05-18T04:29:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EOupug8d0asGTVR6p47xRY7/lLaBEB6lSJCN1fXCwYoHC4DN1UyU+3hDUHwf2Z0lSf813uKoxfjhc6iPAdgXBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T14:32:34.850913Z"},"content_sha256":"aaf63e8e3e4c2a829a417cfe7fd2d045c063cf904565e3911031b69dada01bf5","schema_version":"1.0","event_id":"sha256:aaf63e8e3e4c2a829a417cfe7fd2d045c063cf904565e3911031b69dada01bf5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XCMQJY3PYT26D4OCJH3EZO7DBO/bundle.json","state_url":"https://pith.science/pith/XCMQJY3PYT26D4OCJH3EZO7DBO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XCMQJY3PYT26D4OCJH3EZO7DBO/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":"2026-05-31T14:32:34Z","links":{"resolver":"https://pith.science/pith/XCMQJY3PYT26D4OCJH3EZO7DBO","bundle":"https://pith.science/pith/XCMQJY3PYT26D4OCJH3EZO7DBO/bundle.json","state":"https://pith.science/pith/XCMQJY3PYT26D4OCJH3EZO7DBO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XCMQJY3PYT26D4OCJH3EZO7DBO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2007:XCMQJY3PYT26D4OCJH3EZO7DBO","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":"7e30a04b9e835c661e8c49a4316126239ce75ad0e833e1ee2af40acef1e2295a","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2007-03-14T09:44:02Z","title_canon_sha256":"5f8aec2a718231dab40c84f244602fcdfbfbe6c8b6cb4b6cc0f1716044ce4fed"},"schema_version":"1.0","source":{"id":"astro-ph/0703351","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0703351","created_at":"2026-05-18T04:29:05Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0703351v1","created_at":"2026-05-18T04:29:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0703351","created_at":"2026-05-18T04:29:05Z"},{"alias_kind":"pith_short_12","alias_value":"XCMQJY3PYT26","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_16","alias_value":"XCMQJY3PYT26D4OC","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_8","alias_value":"XCMQJY3P","created_at":"2026-05-18T12:25:56Z"}],"graph_snapshots":[{"event_id":"sha256:aaf63e8e3e4c2a829a417cfe7fd2d045c063cf904565e3911031b69dada01bf5","target":"graph","created_at":"2026-05-18T04:29:05Z","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 analyze the Chandra X-ray spectrum obtained with the HETGS grating spectrometer of IRAS 13349+2438, which has one of the richest absorption spectra of a quasar outflow. Absorption from almost all charge states of Fe is detected. This allows for a detailed reconstruction of the absorption measure distribution (AMD), which we define as the continuous distribution of column density as a function of ionization parameter. We find a double peaked AMD for IRAS 13349+2438 with a total (ionized) column density of N_H = (1.2 +- 0.3)* 10^{22} cm^-2} assuming solar iron abundance. For comparison, we pe","authors_text":"Ehud Behar, Shai Kaspi, Tomer Holczer","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2007-03-14T09:44:02Z","title":"Absorption Measure Distribution of the Outflow in IRAS 13349+2438: Direct Observation of Thermal Instability?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0703351","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:d9e49168b119a2af70df3f4e5b9e03514445105194d29b808ca03e904002e9de","target":"record","created_at":"2026-05-18T04:29:05Z","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":"7e30a04b9e835c661e8c49a4316126239ce75ad0e833e1ee2af40acef1e2295a","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2007-03-14T09:44:02Z","title_canon_sha256":"5f8aec2a718231dab40c84f244602fcdfbfbe6c8b6cb4b6cc0f1716044ce4fed"},"schema_version":"1.0","source":{"id":"astro-ph/0703351","kind":"arxiv","version":1}},"canonical_sha256":"b89904e36fc4f5e1f1c249f64cbbe30bb98585a08d56d80751b683f6a6178880","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b89904e36fc4f5e1f1c249f64cbbe30bb98585a08d56d80751b683f6a6178880","first_computed_at":"2026-05-18T04:29:05.657344Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:29:05.657344Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ExVLET/ZGtpeK2a0J0jPynUaHSDxW3bHo+rjAbZNvDsqQ4Z/tleJPKTYMpTwsoXwlzY1lymEI9YpLZhVCnwkBw==","signature_status":"signed_v1","signed_at":"2026-05-18T04:29:05.657932Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0703351","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d9e49168b119a2af70df3f4e5b9e03514445105194d29b808ca03e904002e9de","sha256:aaf63e8e3e4c2a829a417cfe7fd2d045c063cf904565e3911031b69dada01bf5"],"state_sha256":"f0b70f5eb6b00a6d5c951a892afe8bd438fa6b4c92c83391ccde0f3544cb1091"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Anp1lxWg2cmUmATBgNtXRF+u0eEe7ZGwk+JmtOsFQjg+Pb4JWibJ/oY3Xu+wfQheex/fy3cukYtWwNjpoSSxDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T14:32:34.854288Z","bundle_sha256":"f3018e5bbef6ec9e1c1b0c051e262e0b24f6504f3d7ba10b491f36876114bf65"}}