{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:6WQPNIT4T5LTRYKQF7XJ67RMCS","short_pith_number":"pith:6WQPNIT4","canonical_record":{"source":{"id":"1805.06913","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-05-17T18:20:22Z","cross_cats_sorted":[],"title_canon_sha256":"cdd689207a6cf71a379c683906a3462f920be2fafb6eeba85feacff378e27c67","abstract_canon_sha256":"1216b7bd0f13b8957a8a9be3e6f8b7816da2ba9b1b8828728a0ae9024cdac720"},"schema_version":"1.0"},"canonical_sha256":"f5a0f6a27c9f5738e1502fee9f7e2c148e3ca00d10555aec3bfedb4048912e97","source":{"kind":"arxiv","id":"1805.06913","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.06913","created_at":"2026-05-18T00:14:07Z"},{"alias_kind":"arxiv_version","alias_value":"1805.06913v1","created_at":"2026-05-18T00:14:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.06913","created_at":"2026-05-18T00:14:07Z"},{"alias_kind":"pith_short_12","alias_value":"6WQPNIT4T5LT","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_16","alias_value":"6WQPNIT4T5LTRYKQ","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_8","alias_value":"6WQPNIT4","created_at":"2026-05-18T12:32:11Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:6WQPNIT4T5LTRYKQF7XJ67RMCS","target":"record","payload":{"canonical_record":{"source":{"id":"1805.06913","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-05-17T18:20:22Z","cross_cats_sorted":[],"title_canon_sha256":"cdd689207a6cf71a379c683906a3462f920be2fafb6eeba85feacff378e27c67","abstract_canon_sha256":"1216b7bd0f13b8957a8a9be3e6f8b7816da2ba9b1b8828728a0ae9024cdac720"},"schema_version":"1.0"},"canonical_sha256":"f5a0f6a27c9f5738e1502fee9f7e2c148e3ca00d10555aec3bfedb4048912e97","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:14:07.404126Z","signature_b64":"SgdagmwH9arz9xJTaHjSMaFvMqvsOtkTjDhaGk6FRO9kqgG55s4YEpgu/1upd/ae6c6jGRO1s4zyxAbRBlKWDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f5a0f6a27c9f5738e1502fee9f7e2c148e3ca00d10555aec3bfedb4048912e97","last_reissued_at":"2026-05-18T00:14:07.403674Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:14:07.403674Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1805.06913","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":"2026-05-18T00:14:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"P3m/A0wf3gbfblSEDWlEbhPSlHlfny9CocjTq60yAxCe0NKd/cZCrwwfn/zy95SvLd7WlR27qeEfLfEqZ/OoAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-10T07:58:55.033433Z"},"content_sha256":"de2acbfda8220c6303fb8b617a4a29c34f818a87ac107504cfa1e72404f2e8c5","schema_version":"1.0","event_id":"sha256:de2acbfda8220c6303fb8b617a4a29c34f818a87ac107504cfa1e72404f2e8c5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:6WQPNIT4T5LTRYKQF7XJ67RMCS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Spectroscopic decomposition of the galaxy and halo of the cD galaxy NGC 3311","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Alfonso Aragon-Salamanca, Evelyn J. Johnston, Michael Merrifield","submitted_at":"2018-05-17T18:20:22Z","abstract_excerpt":"Information on the star-formation histories of cD galaxies and their extended stellar haloes lie in their spectra. Therefore, to determine whether these structures evolved together or through a two-phase formation, we need to spectroscopically separate the light from each component. We present a pilot study to use BUDDI to fit and extract the spectra of the cD galaxy NGC 3311 and its halo in an Integral Field Spectroscopy datacube, and carry out a simple stellar populations analysis to study their star-formation histories. Using MUSE data, we were able to isolate the light of the galaxy and it"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.06913","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":"2026-05-18T00:14:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"N76JCPKAPGDuy0NNjUWwGMhTz/Lf7oLYC6Wg/C9fGtpIDZ8nomvSmr3Crb2ZAm/WUlZ93Ku4KlKhSyZ4C3irBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-10T07:58:55.034222Z"},"content_sha256":"34f7d758d4cdbf12f0cb66eb208e3e94356220451046e16ecf2af627cf5f37e1","schema_version":"1.0","event_id":"sha256:34f7d758d4cdbf12f0cb66eb208e3e94356220451046e16ecf2af627cf5f37e1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/6WQPNIT4T5LTRYKQF7XJ67RMCS/bundle.json","state_url":"https://pith.science/pith/6WQPNIT4T5LTRYKQF7XJ67RMCS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/6WQPNIT4T5LTRYKQF7XJ67RMCS/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":"2026-06-10T07:58:55Z","links":{"resolver":"https://pith.science/pith/6WQPNIT4T5LTRYKQF7XJ67RMCS","bundle":"https://pith.science/pith/6WQPNIT4T5LTRYKQF7XJ67RMCS/bundle.json","state":"https://pith.science/pith/6WQPNIT4T5LTRYKQF7XJ67RMCS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/6WQPNIT4T5LTRYKQF7XJ67RMCS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:6WQPNIT4T5LTRYKQF7XJ67RMCS","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":"1216b7bd0f13b8957a8a9be3e6f8b7816da2ba9b1b8828728a0ae9024cdac720","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-05-17T18:20:22Z","title_canon_sha256":"cdd689207a6cf71a379c683906a3462f920be2fafb6eeba85feacff378e27c67"},"schema_version":"1.0","source":{"id":"1805.06913","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.06913","created_at":"2026-05-18T00:14:07Z"},{"alias_kind":"arxiv_version","alias_value":"1805.06913v1","created_at":"2026-05-18T00:14:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.06913","created_at":"2026-05-18T00:14:07Z"},{"alias_kind":"pith_short_12","alias_value":"6WQPNIT4T5LT","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_16","alias_value":"6WQPNIT4T5LTRYKQ","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_8","alias_value":"6WQPNIT4","created_at":"2026-05-18T12:32:11Z"}],"graph_snapshots":[{"event_id":"sha256:34f7d758d4cdbf12f0cb66eb208e3e94356220451046e16ecf2af627cf5f37e1","target":"graph","created_at":"2026-05-18T00:14:07Z","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":"Information on the star-formation histories of cD galaxies and their extended stellar haloes lie in their spectra. Therefore, to determine whether these structures evolved together or through a two-phase formation, we need to spectroscopically separate the light from each component. We present a pilot study to use BUDDI to fit and extract the spectra of the cD galaxy NGC 3311 and its halo in an Integral Field Spectroscopy datacube, and carry out a simple stellar populations analysis to study their star-formation histories. Using MUSE data, we were able to isolate the light of the galaxy and it","authors_text":"Alfonso Aragon-Salamanca, Evelyn J. Johnston, Michael Merrifield","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-05-17T18:20:22Z","title":"Spectroscopic decomposition of the galaxy and halo of the cD galaxy NGC 3311"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.06913","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:de2acbfda8220c6303fb8b617a4a29c34f818a87ac107504cfa1e72404f2e8c5","target":"record","created_at":"2026-05-18T00:14:07Z","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":"1216b7bd0f13b8957a8a9be3e6f8b7816da2ba9b1b8828728a0ae9024cdac720","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-05-17T18:20:22Z","title_canon_sha256":"cdd689207a6cf71a379c683906a3462f920be2fafb6eeba85feacff378e27c67"},"schema_version":"1.0","source":{"id":"1805.06913","kind":"arxiv","version":1}},"canonical_sha256":"f5a0f6a27c9f5738e1502fee9f7e2c148e3ca00d10555aec3bfedb4048912e97","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f5a0f6a27c9f5738e1502fee9f7e2c148e3ca00d10555aec3bfedb4048912e97","first_computed_at":"2026-05-18T00:14:07.403674Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:14:07.403674Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"SgdagmwH9arz9xJTaHjSMaFvMqvsOtkTjDhaGk6FRO9kqgG55s4YEpgu/1upd/ae6c6jGRO1s4zyxAbRBlKWDA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:14:07.404126Z","signed_message":"canonical_sha256_bytes"},"source_id":"1805.06913","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:de2acbfda8220c6303fb8b617a4a29c34f818a87ac107504cfa1e72404f2e8c5","sha256:34f7d758d4cdbf12f0cb66eb208e3e94356220451046e16ecf2af627cf5f37e1"],"state_sha256":"2717f03f8d81464406ea95fbfd9c54485a787e1ac3e546b953d3887f97f3d5cd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1NaCsHX0YuiYTnCMxViF+9bWQ4RrSzRgISSHKrlRmdGqRoP46Nxayp+EJpZF0ZPdW1phpnJe2N+alaJfgwHNBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-10T07:58:55.039194Z","bundle_sha256":"379532da9b0c5504e06c9d25c32c0d7e66a092e53b591673eeb69cd78d0bdee0"}}