{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:Q3QQOY3ZGGHY7ZAJPRBKSWDGH6","short_pith_number":"pith:Q3QQOY3Z","canonical_record":{"source":{"id":"1803.08547","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-03-22T19:02:16Z","cross_cats_sorted":[],"title_canon_sha256":"3298eb9c3ad325c874c516641233123ca40ef312f3c9ee89858c809d4f5d78cd","abstract_canon_sha256":"89977676b926b74fe25e98fe6807789965094dd3de4dcb0898dd811ea687c84d"},"schema_version":"1.0"},"canonical_sha256":"86e1076379318f8fe4097c42a958663fb632ac65ddcb0684a427b43cd14ce068","source":{"kind":"arxiv","id":"1803.08547","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.08547","created_at":"2026-05-18T00:04:44Z"},{"alias_kind":"arxiv_version","alias_value":"1803.08547v2","created_at":"2026-05-18T00:04:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.08547","created_at":"2026-05-18T00:04:44Z"},{"alias_kind":"pith_short_12","alias_value":"Q3QQOY3ZGGHY","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_16","alias_value":"Q3QQOY3ZGGHY7ZAJ","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_8","alias_value":"Q3QQOY3Z","created_at":"2026-05-18T12:32:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:Q3QQOY3ZGGHY7ZAJPRBKSWDGH6","target":"record","payload":{"canonical_record":{"source":{"id":"1803.08547","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-03-22T19:02:16Z","cross_cats_sorted":[],"title_canon_sha256":"3298eb9c3ad325c874c516641233123ca40ef312f3c9ee89858c809d4f5d78cd","abstract_canon_sha256":"89977676b926b74fe25e98fe6807789965094dd3de4dcb0898dd811ea687c84d"},"schema_version":"1.0"},"canonical_sha256":"86e1076379318f8fe4097c42a958663fb632ac65ddcb0684a427b43cd14ce068","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:04:44.935096Z","signature_b64":"DaPpydoikMo81yKXd6pWzFit2ZghrZiSt0SAuxbKPPYccWdIfAmuTuwarZPyHQyUrQG5I6CV+40hDCJbI2K9Dw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"86e1076379318f8fe4097c42a958663fb632ac65ddcb0684a427b43cd14ce068","last_reissued_at":"2026-05-18T00:04:44.934468Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:04:44.934468Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1803.08547","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:04:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"t7M1JVj6ZwRnF0OS8P7XRkDmDtbJb+MTcHQWkEOxbQVlOG5DnmycBPUxcuLTesKDekuCDH2c+k3MdWtg6UONAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-21T06:54:38.403935Z"},"content_sha256":"04738b880deccde5afda6c77a3a22c680bb1f2e315ddc7a74c4099ce4ae9390e","schema_version":"1.0","event_id":"sha256:04738b880deccde5afda6c77a3a22c680bb1f2e315ddc7a74c4099ce4ae9390e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:Q3QQOY3ZGGHY7ZAJPRBKSWDGH6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Chandra COSMOS Legacy Survey: Compton Thick AGN at high redshift","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"A. Comastri, A. M. Koekemoer, C. Vignali, F. Civano, G. Lanzuisi, G. Zamorani, M. Brightman, M. Brusa, R. E. Griffiths, R. Gilli, S. Marchesi","submitted_at":"2018-03-22T19:02:16Z","abstract_excerpt":"The existence of a large population of Compton thick (CT, $N_{H}>10^{24} cm^{-2}$) AGN is a key ingredient of most Cosmic X-ray background synthesis models. However, direct identification of these sources, especially at high redshift, is difficult due to the flux suppression and complex spectral shape produced by CT obscuration. We explored the Chandra COSMOS Legacy point source catalog, comprising 1855 sources, to select via X-ray spectroscopy, a large sample of CT candidates at high redshift. Adopting a physical model to reproduce the toroidal absorber, and a Monte-Carlo sampling method, we "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.08547","kind":"arxiv","version":2},"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":"2026-05-18T00:04:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"c1Ay+B9d8jkMXwylbj48cxbfEb1EmxMgdSxSp5fi0wxm/ZecTH8S5gZH69ggilnHk05yw1fNG2fm+NEzJ4MjCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-21T06:54:38.404286Z"},"content_sha256":"09274184f5f8cee740a399d889892c16572ea7a1246068cdb2a2effd9bfd38ad","schema_version":"1.0","event_id":"sha256:09274184f5f8cee740a399d889892c16572ea7a1246068cdb2a2effd9bfd38ad"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Q3QQOY3ZGGHY7ZAJPRBKSWDGH6/bundle.json","state_url":"https://pith.science/pith/Q3QQOY3ZGGHY7ZAJPRBKSWDGH6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Q3QQOY3ZGGHY7ZAJPRBKSWDGH6/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":"2026-05-21T06:54:38Z","links":{"resolver":"https://pith.science/pith/Q3QQOY3ZGGHY7ZAJPRBKSWDGH6","bundle":"https://pith.science/pith/Q3QQOY3ZGGHY7ZAJPRBKSWDGH6/bundle.json","state":"https://pith.science/pith/Q3QQOY3ZGGHY7ZAJPRBKSWDGH6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Q3QQOY3ZGGHY7ZAJPRBKSWDGH6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:Q3QQOY3ZGGHY7ZAJPRBKSWDGH6","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":"89977676b926b74fe25e98fe6807789965094dd3de4dcb0898dd811ea687c84d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-03-22T19:02:16Z","title_canon_sha256":"3298eb9c3ad325c874c516641233123ca40ef312f3c9ee89858c809d4f5d78cd"},"schema_version":"1.0","source":{"id":"1803.08547","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.08547","created_at":"2026-05-18T00:04:44Z"},{"alias_kind":"arxiv_version","alias_value":"1803.08547v2","created_at":"2026-05-18T00:04:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.08547","created_at":"2026-05-18T00:04:44Z"},{"alias_kind":"pith_short_12","alias_value":"Q3QQOY3ZGGHY","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_16","alias_value":"Q3QQOY3ZGGHY7ZAJ","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_8","alias_value":"Q3QQOY3Z","created_at":"2026-05-18T12:32:46Z"}],"graph_snapshots":[{"event_id":"sha256:09274184f5f8cee740a399d889892c16572ea7a1246068cdb2a2effd9bfd38ad","target":"graph","created_at":"2026-05-18T00:04:44Z","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":"The existence of a large population of Compton thick (CT, $N_{H}>10^{24} cm^{-2}$) AGN is a key ingredient of most Cosmic X-ray background synthesis models. However, direct identification of these sources, especially at high redshift, is difficult due to the flux suppression and complex spectral shape produced by CT obscuration. We explored the Chandra COSMOS Legacy point source catalog, comprising 1855 sources, to select via X-ray spectroscopy, a large sample of CT candidates at high redshift. Adopting a physical model to reproduce the toroidal absorber, and a Monte-Carlo sampling method, we ","authors_text":"A. Comastri, A. M. Koekemoer, C. Vignali, F. Civano, G. Lanzuisi, G. Zamorani, M. Brightman, M. Brusa, R. E. Griffiths, R. Gilli, S. Marchesi","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-03-22T19:02:16Z","title":"The Chandra COSMOS Legacy Survey: Compton Thick AGN at high redshift"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.08547","kind":"arxiv","version":2},"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":"sha256:04738b880deccde5afda6c77a3a22c680bb1f2e315ddc7a74c4099ce4ae9390e","target":"record","created_at":"2026-05-18T00:04:44Z","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":"89977676b926b74fe25e98fe6807789965094dd3de4dcb0898dd811ea687c84d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-03-22T19:02:16Z","title_canon_sha256":"3298eb9c3ad325c874c516641233123ca40ef312f3c9ee89858c809d4f5d78cd"},"schema_version":"1.0","source":{"id":"1803.08547","kind":"arxiv","version":2}},"canonical_sha256":"86e1076379318f8fe4097c42a958663fb632ac65ddcb0684a427b43cd14ce068","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"86e1076379318f8fe4097c42a958663fb632ac65ddcb0684a427b43cd14ce068","first_computed_at":"2026-05-18T00:04:44.934468Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:04:44.934468Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"DaPpydoikMo81yKXd6pWzFit2ZghrZiSt0SAuxbKPPYccWdIfAmuTuwarZPyHQyUrQG5I6CV+40hDCJbI2K9Dw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:04:44.935096Z","signed_message":"canonical_sha256_bytes"},"source_id":"1803.08547","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:04738b880deccde5afda6c77a3a22c680bb1f2e315ddc7a74c4099ce4ae9390e","sha256:09274184f5f8cee740a399d889892c16572ea7a1246068cdb2a2effd9bfd38ad"],"state_sha256":"143cd1b69b1e9acbd4eb6a92fef837b2c97fa610bedf324384134e61ee391ed4"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/tomys6sKDBX1Guo+EwuiGTZpC7bHJNZRyDIhovnfZpBf44sI/DqNMW7we9+1H7I7jowT0yThgYSEwyFqM6mCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-21T06:54:38.406584Z","bundle_sha256":"9b6658cecead9aaad4c64dd61d9957c70b0ac3a7f887a86a36429308003b2481"}}