{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:PBGG2GCLAZ5ZPUN67QFY7XM2JD","short_pith_number":"pith:PBGG2GCL","canonical_record":{"source":{"id":"2109.07964","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-09-16T13:20:00Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"2ac35be8c83b90aa91f01bbe3f05aa2ce84051edb6a4a3f7e6d43a4fefec5135","abstract_canon_sha256":"a7d87715170fc664957261a94930e35b0674007e75207a335a89391a56a4b41a"},"schema_version":"1.0"},"canonical_sha256":"784c6d184b067b97d1befc0b8fdd9a48d58eee3ea030dee1ba85fb38bf678769","source":{"kind":"arxiv","id":"2109.07964","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2109.07964","created_at":"2026-07-05T03:15:03Z"},{"alias_kind":"arxiv_version","alias_value":"2109.07964v1","created_at":"2026-07-05T03:15:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.07964","created_at":"2026-07-05T03:15:03Z"},{"alias_kind":"pith_short_12","alias_value":"PBGG2GCLAZ5Z","created_at":"2026-07-05T03:15:03Z"},{"alias_kind":"pith_short_16","alias_value":"PBGG2GCLAZ5ZPUN6","created_at":"2026-07-05T03:15:03Z"},{"alias_kind":"pith_short_8","alias_value":"PBGG2GCL","created_at":"2026-07-05T03:15:03Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:PBGG2GCLAZ5ZPUN67QFY7XM2JD","target":"record","payload":{"canonical_record":{"source":{"id":"2109.07964","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-09-16T13:20:00Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"2ac35be8c83b90aa91f01bbe3f05aa2ce84051edb6a4a3f7e6d43a4fefec5135","abstract_canon_sha256":"a7d87715170fc664957261a94930e35b0674007e75207a335a89391a56a4b41a"},"schema_version":"1.0"},"canonical_sha256":"784c6d184b067b97d1befc0b8fdd9a48d58eee3ea030dee1ba85fb38bf678769","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:15:03.572300Z","signature_b64":"vm6qJGG478aisb6f0nvGPEB43kDcwTbc11ir0QXecLq52ZXxtgt3gzWk8jR3q+i4XzVTUCYupWWlZlKkgz52Dg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"784c6d184b067b97d1befc0b8fdd9a48d58eee3ea030dee1ba85fb38bf678769","last_reissued_at":"2026-07-05T03:15:03.571840Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:15:03.571840Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2109.07964","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":"2026-07-05T03:15:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bM8/KgtvrCcomL3UjY9sqa313CsCkUBF7n0Rfz/cuezwvUwKhOqpdP0P7wwxmqGrDFIITlsKaA4zs9mTzqP3Bw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T09:48:08.849169Z"},"content_sha256":"4bdaf18d525a5733713932d10e658bf9d9476aae5120fd6f7b04706d67d3c1a4","schema_version":"1.0","event_id":"sha256:4bdaf18d525a5733713932d10e658bf9d9476aae5120fd6f7b04706d67d3c1a4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:PBGG2GCLAZ5ZPUN67QFY7XM2JD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The BIG X-ray tail","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.GA","authors_text":"Alessandro Boselli, Chong Ge, Christine Jones, Eugene Churazov, Irina Zhuravleva, Li Ji, Masafumi Yagi, Matteo Fossati, Ming Sun, Pavel J\\'achym, Rongxin Luo, William Forman","submitted_at":"2021-09-16T13:20:00Z","abstract_excerpt":"Galaxy clusters grow primarily through the continuous accretion of group-scale haloes. Group galaxies experience preprocessing during their journey into clusters. A star-bursting compact group, the Blue Infalling Group (BIG), is plunging into the nearby cluster A1367. Previous optical observations reveal rich tidal features in the BIG members, and a long H$\\alpha$ trail behind. Here we report the discovery of a projected $\\sim 250$ kpc X-ray tail behind the BIG using Chandra and XMM-Newton observations. The total hot gas mass in the tail is $\\sim 7\\times 10^{10}\\ {\\rm M}_\\odot$ with an X-ray b"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.07964","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/2109.07964/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":"2026-07-05T03:15:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PDCKrUl8tfxRlMavwiP6cRDy4bydJyc3qiXlzzOcfkAwZtW/x7nedJBp/Z+B5BBLm4B7Yr+K/nW0X3BK46nUCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T09:48:08.849681Z"},"content_sha256":"10c67a6dd303c76e4b17b263b297ce07218fb99ab6bba0fed7032ae965118632","schema_version":"1.0","event_id":"sha256:10c67a6dd303c76e4b17b263b297ce07218fb99ab6bba0fed7032ae965118632"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PBGG2GCLAZ5ZPUN67QFY7XM2JD/bundle.json","state_url":"https://pith.science/pith/PBGG2GCLAZ5ZPUN67QFY7XM2JD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PBGG2GCLAZ5ZPUN67QFY7XM2JD/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":"2026-08-05T09:48:08Z","links":{"resolver":"https://pith.science/pith/PBGG2GCLAZ5ZPUN67QFY7XM2JD","bundle":"https://pith.science/pith/PBGG2GCLAZ5ZPUN67QFY7XM2JD/bundle.json","state":"https://pith.science/pith/PBGG2GCLAZ5ZPUN67QFY7XM2JD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PBGG2GCLAZ5ZPUN67QFY7XM2JD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:PBGG2GCLAZ5ZPUN67QFY7XM2JD","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":"a7d87715170fc664957261a94930e35b0674007e75207a335a89391a56a4b41a","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-09-16T13:20:00Z","title_canon_sha256":"2ac35be8c83b90aa91f01bbe3f05aa2ce84051edb6a4a3f7e6d43a4fefec5135"},"schema_version":"1.0","source":{"id":"2109.07964","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2109.07964","created_at":"2026-07-05T03:15:03Z"},{"alias_kind":"arxiv_version","alias_value":"2109.07964v1","created_at":"2026-07-05T03:15:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.07964","created_at":"2026-07-05T03:15:03Z"},{"alias_kind":"pith_short_12","alias_value":"PBGG2GCLAZ5Z","created_at":"2026-07-05T03:15:03Z"},{"alias_kind":"pith_short_16","alias_value":"PBGG2GCLAZ5ZPUN6","created_at":"2026-07-05T03:15:03Z"},{"alias_kind":"pith_short_8","alias_value":"PBGG2GCL","created_at":"2026-07-05T03:15:03Z"}],"graph_snapshots":[{"event_id":"sha256:10c67a6dd303c76e4b17b263b297ce07218fb99ab6bba0fed7032ae965118632","target":"graph","created_at":"2026-07-05T03:15:03Z","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/2109.07964/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Galaxy clusters grow primarily through the continuous accretion of group-scale haloes. Group galaxies experience preprocessing during their journey into clusters. A star-bursting compact group, the Blue Infalling Group (BIG), is plunging into the nearby cluster A1367. Previous optical observations reveal rich tidal features in the BIG members, and a long H$\\alpha$ trail behind. Here we report the discovery of a projected $\\sim 250$ kpc X-ray tail behind the BIG using Chandra and XMM-Newton observations. The total hot gas mass in the tail is $\\sim 7\\times 10^{10}\\ {\\rm M}_\\odot$ with an X-ray b","authors_text":"Alessandro Boselli, Chong Ge, Christine Jones, Eugene Churazov, Irina Zhuravleva, Li Ji, Masafumi Yagi, Matteo Fossati, Ming Sun, Pavel J\\'achym, Rongxin Luo, William Forman","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-09-16T13:20:00Z","title":"The BIG X-ray tail"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.07964","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":"sha256:4bdaf18d525a5733713932d10e658bf9d9476aae5120fd6f7b04706d67d3c1a4","target":"record","created_at":"2026-07-05T03:15:03Z","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":"a7d87715170fc664957261a94930e35b0674007e75207a335a89391a56a4b41a","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-09-16T13:20:00Z","title_canon_sha256":"2ac35be8c83b90aa91f01bbe3f05aa2ce84051edb6a4a3f7e6d43a4fefec5135"},"schema_version":"1.0","source":{"id":"2109.07964","kind":"arxiv","version":1}},"canonical_sha256":"784c6d184b067b97d1befc0b8fdd9a48d58eee3ea030dee1ba85fb38bf678769","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"784c6d184b067b97d1befc0b8fdd9a48d58eee3ea030dee1ba85fb38bf678769","first_computed_at":"2026-07-05T03:15:03.571840Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:15:03.571840Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"vm6qJGG478aisb6f0nvGPEB43kDcwTbc11ir0QXecLq52ZXxtgt3gzWk8jR3q+i4XzVTUCYupWWlZlKkgz52Dg==","signature_status":"signed_v1","signed_at":"2026-07-05T03:15:03.572300Z","signed_message":"canonical_sha256_bytes"},"source_id":"2109.07964","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4bdaf18d525a5733713932d10e658bf9d9476aae5120fd6f7b04706d67d3c1a4","sha256:10c67a6dd303c76e4b17b263b297ce07218fb99ab6bba0fed7032ae965118632"],"state_sha256":"b538620e7e2175008bb6e01efb68dcd54f4d3cfcf91a549d1e087558041475f3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yNgVqSPB9Z2YojQQSrRmXThf+b49xz8HIEVbsK/c3h8EJ0EGclJelv162lzVFI5x9X0/KV3MztZHDV/qrlybBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T09:48:08.853545Z","bundle_sha256":"92a193509714feecfa6de84dc1418feac89ef531fcd1b144fe23024336d4fc6e"}}