{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:QRX4URJVK655KCBDGVPHC6ZW64","short_pith_number":"pith:QRX4URJV","canonical_record":{"source":{"id":"1510.01779","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-10-06T23:30:12Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"fb9fd6d1247abca1efd054ae62cc2c71ca7f92109a53d7cc0cd5dcc542d86990","abstract_canon_sha256":"9be70f9796a7bb3e31fc0d18884c09fb6484b62bea5c24e07fd70889674a5e0e"},"schema_version":"1.0"},"canonical_sha256":"846fca453557bbd50823355e717b36f711d0d35c3de55ebb11776955d7c77076","source":{"kind":"arxiv","id":"1510.01779","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.01779","created_at":"2026-05-18T01:26:41Z"},{"alias_kind":"arxiv_version","alias_value":"1510.01779v1","created_at":"2026-05-18T01:26:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.01779","created_at":"2026-05-18T01:26:41Z"},{"alias_kind":"pith_short_12","alias_value":"QRX4URJVK655","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_16","alias_value":"QRX4URJVK655KCBD","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_8","alias_value":"QRX4URJV","created_at":"2026-05-18T12:29:37Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:QRX4URJVK655KCBDGVPHC6ZW64","target":"record","payload":{"canonical_record":{"source":{"id":"1510.01779","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-10-06T23:30:12Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"fb9fd6d1247abca1efd054ae62cc2c71ca7f92109a53d7cc0cd5dcc542d86990","abstract_canon_sha256":"9be70f9796a7bb3e31fc0d18884c09fb6484b62bea5c24e07fd70889674a5e0e"},"schema_version":"1.0"},"canonical_sha256":"846fca453557bbd50823355e717b36f711d0d35c3de55ebb11776955d7c77076","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:26:41.164392Z","signature_b64":"p2l9Tr5rqYpXyhMnIN+czp5PSaihOqfZYSyt1/N+M5us1P5did/6ykKM+0lRrWsOBpRm3yMXfRLgIsde2E27BA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"846fca453557bbd50823355e717b36f711d0d35c3de55ebb11776955d7c77076","last_reissued_at":"2026-05-18T01:26:41.163684Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:26:41.163684Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1510.01779","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":"2026-05-18T01:26:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4eBV3WUaAnQCJW6uYUAxjDmbHT+XYM6Wzte+1eHwF0SHIKqZ33DZwURxPeJvyiw4mW9BB/Xz17oxx6Uw+oK/Bw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T11:35:27.400157Z"},"content_sha256":"c512a120687c11f677d41b6b43eb270726d5563f1f778ca56cdd32e86973c279","schema_version":"1.0","event_id":"sha256:c512a120687c11f677d41b6b43eb270726d5563f1f778ca56cdd32e86973c279"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:QRX4URJVK655KCBDGVPHC6ZW64","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Cluster-Scale Environment of PKS 2155-304","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.GA","authors_text":"E. P. Farina, M. Fumagalli, N. Fanidakis, R. Decarli","submitted_at":"2015-10-06T23:30:12Z","abstract_excerpt":"PKS 2155-304 is one of the brightest extragalactic source in the X-ray and EUV bands, and is a prototype for the BL Lac class of objects. In this paper we investigate the large-scale environment of this source using new multi-object as well as long-slit spectroscopy, together with archival spectra and optical images. We find clear evidence of a modest overdensity of galaxies at z=0.11610, consistent with previous determinations of the BL Lac redshift. The galaxy group has a radial velocity dispersion of 250km/s and a virial radius of 0.22Mpc, yielding a role-of-thumb estimate of the virial mas"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.01779","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":"2026-05-18T01:26:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"o8jK/hEjSlAccNXB8U20npr5R9dxNFJZPnCMUD5iHSLDvVT3gRwLHFVXMaXCXpgP7YeeWmW6ivjeb70t1nvUAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T11:35:27.400812Z"},"content_sha256":"52fba1c3f27b9059d5ab450cb1b4c6e6ccb078d3d9943599619ba863cab1df3a","schema_version":"1.0","event_id":"sha256:52fba1c3f27b9059d5ab450cb1b4c6e6ccb078d3d9943599619ba863cab1df3a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QRX4URJVK655KCBDGVPHC6ZW64/bundle.json","state_url":"https://pith.science/pith/QRX4URJVK655KCBDGVPHC6ZW64/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QRX4URJVK655KCBDGVPHC6ZW64/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":"2026-05-26T11:35:27Z","links":{"resolver":"https://pith.science/pith/QRX4URJVK655KCBDGVPHC6ZW64","bundle":"https://pith.science/pith/QRX4URJVK655KCBDGVPHC6ZW64/bundle.json","state":"https://pith.science/pith/QRX4URJVK655KCBDGVPHC6ZW64/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QRX4URJVK655KCBDGVPHC6ZW64/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:QRX4URJVK655KCBDGVPHC6ZW64","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":"9be70f9796a7bb3e31fc0d18884c09fb6484b62bea5c24e07fd70889674a5e0e","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-10-06T23:30:12Z","title_canon_sha256":"fb9fd6d1247abca1efd054ae62cc2c71ca7f92109a53d7cc0cd5dcc542d86990"},"schema_version":"1.0","source":{"id":"1510.01779","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.01779","created_at":"2026-05-18T01:26:41Z"},{"alias_kind":"arxiv_version","alias_value":"1510.01779v1","created_at":"2026-05-18T01:26:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.01779","created_at":"2026-05-18T01:26:41Z"},{"alias_kind":"pith_short_12","alias_value":"QRX4URJVK655","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_16","alias_value":"QRX4URJVK655KCBD","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_8","alias_value":"QRX4URJV","created_at":"2026-05-18T12:29:37Z"}],"graph_snapshots":[{"event_id":"sha256:52fba1c3f27b9059d5ab450cb1b4c6e6ccb078d3d9943599619ba863cab1df3a","target":"graph","created_at":"2026-05-18T01:26:41Z","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":"PKS 2155-304 is one of the brightest extragalactic source in the X-ray and EUV bands, and is a prototype for the BL Lac class of objects. In this paper we investigate the large-scale environment of this source using new multi-object as well as long-slit spectroscopy, together with archival spectra and optical images. We find clear evidence of a modest overdensity of galaxies at z=0.11610, consistent with previous determinations of the BL Lac redshift. The galaxy group has a radial velocity dispersion of 250km/s and a virial radius of 0.22Mpc, yielding a role-of-thumb estimate of the virial mas","authors_text":"E. P. Farina, M. Fumagalli, N. Fanidakis, R. Decarli","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-10-06T23:30:12Z","title":"The Cluster-Scale Environment of PKS 2155-304"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.01779","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:c512a120687c11f677d41b6b43eb270726d5563f1f778ca56cdd32e86973c279","target":"record","created_at":"2026-05-18T01:26:41Z","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":"9be70f9796a7bb3e31fc0d18884c09fb6484b62bea5c24e07fd70889674a5e0e","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-10-06T23:30:12Z","title_canon_sha256":"fb9fd6d1247abca1efd054ae62cc2c71ca7f92109a53d7cc0cd5dcc542d86990"},"schema_version":"1.0","source":{"id":"1510.01779","kind":"arxiv","version":1}},"canonical_sha256":"846fca453557bbd50823355e717b36f711d0d35c3de55ebb11776955d7c77076","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"846fca453557bbd50823355e717b36f711d0d35c3de55ebb11776955d7c77076","first_computed_at":"2026-05-18T01:26:41.163684Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:26:41.163684Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"p2l9Tr5rqYpXyhMnIN+czp5PSaihOqfZYSyt1/N+M5us1P5did/6ykKM+0lRrWsOBpRm3yMXfRLgIsde2E27BA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:26:41.164392Z","signed_message":"canonical_sha256_bytes"},"source_id":"1510.01779","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c512a120687c11f677d41b6b43eb270726d5563f1f778ca56cdd32e86973c279","sha256:52fba1c3f27b9059d5ab450cb1b4c6e6ccb078d3d9943599619ba863cab1df3a"],"state_sha256":"0b6903405e1a94a368893fde078b408813041e01ac22483ed6d8c4001f7876b3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rtoSJj+FWtLcvWKdB6ofgoWTpdcyENwuRWzJj+Wy6CwH6jGq9/LyqnHsV8pcaU8RwV6GlBbAxe0R2G5WGxJjDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T11:35:27.404338Z","bundle_sha256":"7c4d22fc69265a21551e2507f39340f3d74fff7e80d6b2ea34d901147f25ded1"}}