{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:VSJAJV3JRLPF6QNQIV4LOTCFAD","short_pith_number":"pith:VSJAJV3J","canonical_record":{"source":{"id":"2401.03022","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2024-01-05T19:00:04Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"8b888ec5d05519959c3caa138d29d705cf291c624d754f55161b20bd079eff8f","abstract_canon_sha256":"857fc1c96736c918a5fb621324760fdf1c903ccc985ab7710945ca74b7c9db93"},"schema_version":"1.0"},"canonical_sha256":"ac9204d7698ade5f41b04578b74c4500dd38780be63af89bd8740b6e99810d55","source":{"kind":"arxiv","id":"2401.03022","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2401.03022","created_at":"2026-07-05T07:31:01Z"},{"alias_kind":"arxiv_version","alias_value":"2401.03022v1","created_at":"2026-07-05T07:31:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2401.03022","created_at":"2026-07-05T07:31:01Z"},{"alias_kind":"pith_short_12","alias_value":"VSJAJV3JRLPF","created_at":"2026-07-05T07:31:01Z"},{"alias_kind":"pith_short_16","alias_value":"VSJAJV3JRLPF6QNQ","created_at":"2026-07-05T07:31:01Z"},{"alias_kind":"pith_short_8","alias_value":"VSJAJV3J","created_at":"2026-07-05T07:31:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:VSJAJV3JRLPF6QNQIV4LOTCFAD","target":"record","payload":{"canonical_record":{"source":{"id":"2401.03022","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2024-01-05T19:00:04Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"8b888ec5d05519959c3caa138d29d705cf291c624d754f55161b20bd079eff8f","abstract_canon_sha256":"857fc1c96736c918a5fb621324760fdf1c903ccc985ab7710945ca74b7c9db93"},"schema_version":"1.0"},"canonical_sha256":"ac9204d7698ade5f41b04578b74c4500dd38780be63af89bd8740b6e99810d55","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T07:31:01.310169Z","signature_b64":"FuzRVX8GjWT4K+KKRRp/dkF+AKff50tjTUEcH0D4SgCY//vr8a7M9v21/wITSEQ/adDoNYjZWwArzonnvs7+Cg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ac9204d7698ade5f41b04578b74c4500dd38780be63af89bd8740b6e99810d55","last_reissued_at":"2026-07-05T07:31:01.309775Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T07:31:01.309775Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2401.03022","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":"2026-07-05T07:31:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vqPjr8UboF8ubUA2GrQMA2MWkazQXX5j4XQ2E0N29Kg8EhjnHkcDTWEuoF5tUxFX9XUERzKVFVrdlhHeZ2zYCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T14:40:55.021071Z"},"content_sha256":"aeb437a171f749e7188e3cfd56d087652d4e50587295ef1ca79a6ba6b192976f","schema_version":"1.0","event_id":"sha256:aeb437a171f749e7188e3cfd56d087652d4e50587295ef1ca79a6ba6b192976f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:VSJAJV3JRLPF6QNQIV4LOTCFAD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A cooling flow around the low-redshift quasar H1821+643","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.HE","authors_text":"A. C. Fabian, C. S. Reynolds, H. R. Russell, J. S. Sanders, L. Clews, M. McDonald, P. E. J. Nulsen, S. Veilleux, T. E. Braben, W. N. Brandt","submitted_at":"2024-01-05T19:00:04Z","abstract_excerpt":"H1821+643 is the nearest quasar hosted by a galaxy cluster. The energy output by the quasar, in the form of intense radiation and radio jets, is captured by the surrounding hot atmosphere. Here we present a new deep Chandra observation of H1821+643 and extract the hot gas properties into the region where Compton cooling by the quasar radiation is expected to dominate. Using detailed simulations to subtract the quasar light, we show that the soft-band surface brightness of the hot atmosphere increases rapidly by a factor of ~ 30 within the central ~ 10 kpc. The gas temperature drops precipitous"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2401.03022","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2401.03022/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T07:31:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Cle3EroGzf10clv/ApmFnpsf0emwpUECyzUist4jkUj+WAb7ZUA4gWkaqPaajvqQr5U7UTA25IjwFfycvWqCBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T14:40:55.021709Z"},"content_sha256":"74daa5886513e9dfb3df467906874dd5e95431ef5eb4c3de491119434b6738dd","schema_version":"1.0","event_id":"sha256:74daa5886513e9dfb3df467906874dd5e95431ef5eb4c3de491119434b6738dd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VSJAJV3JRLPF6QNQIV4LOTCFAD/bundle.json","state_url":"https://pith.science/pith/VSJAJV3JRLPF6QNQIV4LOTCFAD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VSJAJV3JRLPF6QNQIV4LOTCFAD/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":"2026-07-05T14:40:55Z","links":{"resolver":"https://pith.science/pith/VSJAJV3JRLPF6QNQIV4LOTCFAD","bundle":"https://pith.science/pith/VSJAJV3JRLPF6QNQIV4LOTCFAD/bundle.json","state":"https://pith.science/pith/VSJAJV3JRLPF6QNQIV4LOTCFAD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VSJAJV3JRLPF6QNQIV4LOTCFAD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:VSJAJV3JRLPF6QNQIV4LOTCFAD","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":"857fc1c96736c918a5fb621324760fdf1c903ccc985ab7710945ca74b7c9db93","cross_cats_sorted":["astro-ph.GA"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2024-01-05T19:00:04Z","title_canon_sha256":"8b888ec5d05519959c3caa138d29d705cf291c624d754f55161b20bd079eff8f"},"schema_version":"1.0","source":{"id":"2401.03022","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2401.03022","created_at":"2026-07-05T07:31:01Z"},{"alias_kind":"arxiv_version","alias_value":"2401.03022v1","created_at":"2026-07-05T07:31:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2401.03022","created_at":"2026-07-05T07:31:01Z"},{"alias_kind":"pith_short_12","alias_value":"VSJAJV3JRLPF","created_at":"2026-07-05T07:31:01Z"},{"alias_kind":"pith_short_16","alias_value":"VSJAJV3JRLPF6QNQ","created_at":"2026-07-05T07:31:01Z"},{"alias_kind":"pith_short_8","alias_value":"VSJAJV3J","created_at":"2026-07-05T07:31:01Z"}],"graph_snapshots":[{"event_id":"sha256:74daa5886513e9dfb3df467906874dd5e95431ef5eb4c3de491119434b6738dd","target":"graph","created_at":"2026-07-05T07:31:01Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2401.03022/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"H1821+643 is the nearest quasar hosted by a galaxy cluster. The energy output by the quasar, in the form of intense radiation and radio jets, is captured by the surrounding hot atmosphere. Here we present a new deep Chandra observation of H1821+643 and extract the hot gas properties into the region where Compton cooling by the quasar radiation is expected to dominate. Using detailed simulations to subtract the quasar light, we show that the soft-band surface brightness of the hot atmosphere increases rapidly by a factor of ~ 30 within the central ~ 10 kpc. The gas temperature drops precipitous","authors_text":"A. C. Fabian, C. S. Reynolds, H. R. Russell, J. S. Sanders, L. Clews, M. McDonald, P. E. J. Nulsen, S. Veilleux, T. E. Braben, W. N. Brandt","cross_cats":["astro-ph.GA"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2024-01-05T19:00:04Z","title":"A cooling flow around the low-redshift quasar H1821+643"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2401.03022","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:aeb437a171f749e7188e3cfd56d087652d4e50587295ef1ca79a6ba6b192976f","target":"record","created_at":"2026-07-05T07:31:01Z","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":"857fc1c96736c918a5fb621324760fdf1c903ccc985ab7710945ca74b7c9db93","cross_cats_sorted":["astro-ph.GA"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2024-01-05T19:00:04Z","title_canon_sha256":"8b888ec5d05519959c3caa138d29d705cf291c624d754f55161b20bd079eff8f"},"schema_version":"1.0","source":{"id":"2401.03022","kind":"arxiv","version":1}},"canonical_sha256":"ac9204d7698ade5f41b04578b74c4500dd38780be63af89bd8740b6e99810d55","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ac9204d7698ade5f41b04578b74c4500dd38780be63af89bd8740b6e99810d55","first_computed_at":"2026-07-05T07:31:01.309775Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T07:31:01.309775Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"FuzRVX8GjWT4K+KKRRp/dkF+AKff50tjTUEcH0D4SgCY//vr8a7M9v21/wITSEQ/adDoNYjZWwArzonnvs7+Cg==","signature_status":"signed_v1","signed_at":"2026-07-05T07:31:01.310169Z","signed_message":"canonical_sha256_bytes"},"source_id":"2401.03022","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:aeb437a171f749e7188e3cfd56d087652d4e50587295ef1ca79a6ba6b192976f","sha256:74daa5886513e9dfb3df467906874dd5e95431ef5eb4c3de491119434b6738dd"],"state_sha256":"d0f698619c7429e225d79f3fedce5188a025423dcb6a16ba72b57683bc7fb14d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VCWDHM7+3KoOR74uL5iWhqCuZ5eNG3QzTSDtGd/NRdq6kwcsEJqx1HlkX5dTv4wougn9+Al4WuTMND3Gc7nrDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-05T14:40:55.024587Z","bundle_sha256":"b42ca40d66a16ab23749dc78febc9e287caf6e44b7f9f89a4cc55a918232fa00"}}