{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:BXFOYZWWBFWLEPPDSPT7EFZXIB","short_pith_number":"pith:BXFOYZWW","canonical_record":{"source":{"id":"0906.0287","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-06-01T13:52:11Z","cross_cats_sorted":[],"title_canon_sha256":"5d86e7e169ec70777bf90b2badb563a44eb074866a8217585377b6981b0281f6","abstract_canon_sha256":"f27638bb6c54189ef935c978c80824c019688b4c7d233824817f74546a4c5862"},"schema_version":"1.0"},"canonical_sha256":"0dcaec66d6096cb23de393e7f2173740538ad34d704b8fb94ab6ea56c72a8598","source":{"kind":"arxiv","id":"0906.0287","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0906.0287","created_at":"2026-05-18T02:13:30Z"},{"alias_kind":"arxiv_version","alias_value":"0906.0287v1","created_at":"2026-05-18T02:13:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0906.0287","created_at":"2026-05-18T02:13:30Z"},{"alias_kind":"pith_short_12","alias_value":"BXFOYZWWBFWL","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"BXFOYZWWBFWLEPPD","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"BXFOYZWW","created_at":"2026-05-18T12:25:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:BXFOYZWWBFWLEPPDSPT7EFZXIB","target":"record","payload":{"canonical_record":{"source":{"id":"0906.0287","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-06-01T13:52:11Z","cross_cats_sorted":[],"title_canon_sha256":"5d86e7e169ec70777bf90b2badb563a44eb074866a8217585377b6981b0281f6","abstract_canon_sha256":"f27638bb6c54189ef935c978c80824c019688b4c7d233824817f74546a4c5862"},"schema_version":"1.0"},"canonical_sha256":"0dcaec66d6096cb23de393e7f2173740538ad34d704b8fb94ab6ea56c72a8598","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:13:30.087032Z","signature_b64":"A++lyXOulTmN8uj1F20VwG9Dm1nJcAU20ImRTqVJIxTLkBi5F3LaC/dmcjT7ZjTvnorubvydEiugd16WKuWUAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0dcaec66d6096cb23de393e7f2173740538ad34d704b8fb94ab6ea56c72a8598","last_reissued_at":"2026-05-18T02:13:30.086343Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:13:30.086343Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0906.0287","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":"2026-05-18T02:13:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"buM6ihy8V5D7ZkMvZFesuNyaWInXqPlPQUoGbCIKoSx1iJU+9V3FzH8qwXCBSlFCXLRV8r1M1+/9ZdU9czeXCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-20T02:48:46.252901Z"},"content_sha256":"e9817d403161145db4cfcdc80d1f285fdec4a6c6c84d95ff574a3b10f4e0cc91","schema_version":"1.0","event_id":"sha256:e9817d403161145db4cfcdc80d1f285fdec4a6c6c84d95ff574a3b10f4e0cc91"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:BXFOYZWWBFWLEPPDSPT7EFZXIB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Stellar populations in the centres of brightest cluster galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"A.E. Sansom (UCLan), IAC), I.K. Soechting (Oxford), P. Sanchez-Blazquez (UCLan, S.I. Loubser (UCLan, UWC)","submitted_at":"2009-06-01T13:52:11Z","abstract_excerpt":"This paper is part of a series devoted to the study of the stellar populations in brightest cluster galaxies (BCGs), aimed at setting constraints on the formation and evolution of these objects. We have obtained high signal-to-noise ratio, long-slit spectra of 49 BCGs in the nearby Universe. Here, we derive Single Stellar Population (SSP)-equivalent ages, metallicities and alpha-abundance ratios in the centres of the galaxies using the Lick/IDS system of absorption line indices. We systematically compare the indices and derived parameters for the BCGs with those of large samples of ordinary el"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0906.0287","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":"2026-05-18T02:13:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"U8bM3JqoD2khkCrv0slpA23Y7h4bMwutevWbEB7qLCv7E8WvnNzVL2aki//niY96dPLUAqsdG4VvMYbMVOzlBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-20T02:48:46.253238Z"},"content_sha256":"7156d4dfb53d8f696b90657f09e5ea994a97f85d3204f280b015c88e87c812e2","schema_version":"1.0","event_id":"sha256:7156d4dfb53d8f696b90657f09e5ea994a97f85d3204f280b015c88e87c812e2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BXFOYZWWBFWLEPPDSPT7EFZXIB/bundle.json","state_url":"https://pith.science/pith/BXFOYZWWBFWLEPPDSPT7EFZXIB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BXFOYZWWBFWLEPPDSPT7EFZXIB/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":"2026-06-20T02:48:46Z","links":{"resolver":"https://pith.science/pith/BXFOYZWWBFWLEPPDSPT7EFZXIB","bundle":"https://pith.science/pith/BXFOYZWWBFWLEPPDSPT7EFZXIB/bundle.json","state":"https://pith.science/pith/BXFOYZWWBFWLEPPDSPT7EFZXIB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BXFOYZWWBFWLEPPDSPT7EFZXIB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:BXFOYZWWBFWLEPPDSPT7EFZXIB","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":"f27638bb6c54189ef935c978c80824c019688b4c7d233824817f74546a4c5862","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-06-01T13:52:11Z","title_canon_sha256":"5d86e7e169ec70777bf90b2badb563a44eb074866a8217585377b6981b0281f6"},"schema_version":"1.0","source":{"id":"0906.0287","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0906.0287","created_at":"2026-05-18T02:13:30Z"},{"alias_kind":"arxiv_version","alias_value":"0906.0287v1","created_at":"2026-05-18T02:13:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0906.0287","created_at":"2026-05-18T02:13:30Z"},{"alias_kind":"pith_short_12","alias_value":"BXFOYZWWBFWL","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"BXFOYZWWBFWLEPPD","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"BXFOYZWW","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:7156d4dfb53d8f696b90657f09e5ea994a97f85d3204f280b015c88e87c812e2","target":"graph","created_at":"2026-05-18T02:13:30Z","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":"This paper is part of a series devoted to the study of the stellar populations in brightest cluster galaxies (BCGs), aimed at setting constraints on the formation and evolution of these objects. We have obtained high signal-to-noise ratio, long-slit spectra of 49 BCGs in the nearby Universe. Here, we derive Single Stellar Population (SSP)-equivalent ages, metallicities and alpha-abundance ratios in the centres of the galaxies using the Lick/IDS system of absorption line indices. We systematically compare the indices and derived parameters for the BCGs with those of large samples of ordinary el","authors_text":"A.E. Sansom (UCLan), IAC), I.K. Soechting (Oxford), P. Sanchez-Blazquez (UCLan, S.I. Loubser (UCLan, UWC)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-06-01T13:52:11Z","title":"Stellar populations in the centres of brightest cluster galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0906.0287","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:e9817d403161145db4cfcdc80d1f285fdec4a6c6c84d95ff574a3b10f4e0cc91","target":"record","created_at":"2026-05-18T02:13:30Z","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":"f27638bb6c54189ef935c978c80824c019688b4c7d233824817f74546a4c5862","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-06-01T13:52:11Z","title_canon_sha256":"5d86e7e169ec70777bf90b2badb563a44eb074866a8217585377b6981b0281f6"},"schema_version":"1.0","source":{"id":"0906.0287","kind":"arxiv","version":1}},"canonical_sha256":"0dcaec66d6096cb23de393e7f2173740538ad34d704b8fb94ab6ea56c72a8598","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0dcaec66d6096cb23de393e7f2173740538ad34d704b8fb94ab6ea56c72a8598","first_computed_at":"2026-05-18T02:13:30.086343Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:13:30.086343Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"A++lyXOulTmN8uj1F20VwG9Dm1nJcAU20ImRTqVJIxTLkBi5F3LaC/dmcjT7ZjTvnorubvydEiugd16WKuWUAA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:13:30.087032Z","signed_message":"canonical_sha256_bytes"},"source_id":"0906.0287","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e9817d403161145db4cfcdc80d1f285fdec4a6c6c84d95ff574a3b10f4e0cc91","sha256:7156d4dfb53d8f696b90657f09e5ea994a97f85d3204f280b015c88e87c812e2"],"state_sha256":"ceb91939cf16bcffa989d71f1ad045679e1522c3182e405ee433e6d527b5ba79"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vB/96cDC+jdrC9jGhduCbG4S6AI00pwK7q06f+nmQuqv1FrT3EfkzJuLbtAIsArmTycYk/S6Xsw5SbAnRAvDDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-20T02:48:46.255491Z","bundle_sha256":"c145b7737424cd78de4d500dc992ca4f023c3112d653e7ebf34b4b24dab5e8c6"}}