{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:XUHY2I33GLYNE3WYTEVE67ZR56","short_pith_number":"pith:XUHY2I33","canonical_record":{"source":{"id":"1807.08765","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-07-23T18:00:28Z","cross_cats_sorted":[],"title_canon_sha256":"c021739330b42b007f05d5522fedd04dffa0e00e5a2b22c4312b825210479cc3","abstract_canon_sha256":"a518081ab7b865a5677b527cba5a7cb5b8696311d1df2ecb578d28b0130603f0"},"schema_version":"1.0"},"canonical_sha256":"bd0f8d237b32f0d26ed8992a4f7f31ef9965305a041bb689c4eb85e9ef220034","source":{"kind":"arxiv","id":"1807.08765","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.08765","created_at":"2026-05-18T00:08:37Z"},{"alias_kind":"arxiv_version","alias_value":"1807.08765v1","created_at":"2026-05-18T00:08:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.08765","created_at":"2026-05-18T00:08:37Z"},{"alias_kind":"pith_short_12","alias_value":"XUHY2I33GLYN","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_16","alias_value":"XUHY2I33GLYNE3WY","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_8","alias_value":"XUHY2I33","created_at":"2026-05-18T12:33:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:XUHY2I33GLYNE3WYTEVE67ZR56","target":"record","payload":{"canonical_record":{"source":{"id":"1807.08765","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-07-23T18:00:28Z","cross_cats_sorted":[],"title_canon_sha256":"c021739330b42b007f05d5522fedd04dffa0e00e5a2b22c4312b825210479cc3","abstract_canon_sha256":"a518081ab7b865a5677b527cba5a7cb5b8696311d1df2ecb578d28b0130603f0"},"schema_version":"1.0"},"canonical_sha256":"bd0f8d237b32f0d26ed8992a4f7f31ef9965305a041bb689c4eb85e9ef220034","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:08:37.906337Z","signature_b64":"k+xJ1Ta58vSFA4RPdlEFVPFsb/t4Pz5xvu+7FrEzJWT0JgQO9rZE9Degh/Z7wIqJE4pgu31AH2nX+PW+D7ldBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bd0f8d237b32f0d26ed8992a4f7f31ef9965305a041bb689c4eb85e9ef220034","last_reissued_at":"2026-05-18T00:08:37.905645Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:08:37.905645Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1807.08765","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":"2026-05-18T00:08:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sgpJQyJHPk5ZfYl7hksTZQDmfYQYB3mgJswcfv7zz2z1NqvQNXXlnmXYlf20xRSKRHU/js+Cp4LtOQk/wWE1Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T20:02:11.956085Z"},"content_sha256":"496eb5f2b0b4c843ede969d87f2fcf0d416cd1db1ba31e2d521fcc47d57d0105","schema_version":"1.0","event_id":"sha256:496eb5f2b0b4c843ede969d87f2fcf0d416cd1db1ba31e2d521fcc47d57d0105"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:XUHY2I33GLYNE3WYTEVE67ZR56","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Stellar populations and star formation histories of the nuclear star clusters in six nearby galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Anil C. Seth, C. Jakob Walcher, Michele Cappellari, Nadine Neumayer, Nikolay Kacharov, Richard McDermid, Torsten B\\\"oker","submitted_at":"2018-07-23T18:00:28Z","abstract_excerpt":"The majority of spiral and elliptical galaxies in the Universe host very dense and compact stellar systems at their centres known as nuclear star clusters (NSCs). In this work we study the stellar populations and star formation histories (SFH) of the NSCs of six nearby galaxies with stellar masses ranging between $2$ and $8\\times10^9~{\\rm M_{\\odot}}$ (four late-type spirals and two early-types) with high resolution spectroscopy. Our observations are taken with the X-Shooter spectrograph at the VLT. We make use of an empirical simple stellar population (SSP) model grid to fit composite stellar "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.08765","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":"2026-05-18T00:08:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EAVP9a33sgRey14wUT26X7FnWgEqN2ruQEw+m5e5MuUPAmMhXxAalrhXwmV0oEehXdlcY2wXTXofX4Wa3lllCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T20:02:11.956827Z"},"content_sha256":"b50361a941d26df11d2b43bafa47d77e1d7800000201d77ffe14bd1da33472ab","schema_version":"1.0","event_id":"sha256:b50361a941d26df11d2b43bafa47d77e1d7800000201d77ffe14bd1da33472ab"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XUHY2I33GLYNE3WYTEVE67ZR56/bundle.json","state_url":"https://pith.science/pith/XUHY2I33GLYNE3WYTEVE67ZR56/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XUHY2I33GLYNE3WYTEVE67ZR56/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":"2026-06-08T20:02:11Z","links":{"resolver":"https://pith.science/pith/XUHY2I33GLYNE3WYTEVE67ZR56","bundle":"https://pith.science/pith/XUHY2I33GLYNE3WYTEVE67ZR56/bundle.json","state":"https://pith.science/pith/XUHY2I33GLYNE3WYTEVE67ZR56/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XUHY2I33GLYNE3WYTEVE67ZR56/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:XUHY2I33GLYNE3WYTEVE67ZR56","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":"a518081ab7b865a5677b527cba5a7cb5b8696311d1df2ecb578d28b0130603f0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-07-23T18:00:28Z","title_canon_sha256":"c021739330b42b007f05d5522fedd04dffa0e00e5a2b22c4312b825210479cc3"},"schema_version":"1.0","source":{"id":"1807.08765","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.08765","created_at":"2026-05-18T00:08:37Z"},{"alias_kind":"arxiv_version","alias_value":"1807.08765v1","created_at":"2026-05-18T00:08:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.08765","created_at":"2026-05-18T00:08:37Z"},{"alias_kind":"pith_short_12","alias_value":"XUHY2I33GLYN","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_16","alias_value":"XUHY2I33GLYNE3WY","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_8","alias_value":"XUHY2I33","created_at":"2026-05-18T12:33:01Z"}],"graph_snapshots":[{"event_id":"sha256:b50361a941d26df11d2b43bafa47d77e1d7800000201d77ffe14bd1da33472ab","target":"graph","created_at":"2026-05-18T00:08:37Z","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":"The majority of spiral and elliptical galaxies in the Universe host very dense and compact stellar systems at their centres known as nuclear star clusters (NSCs). In this work we study the stellar populations and star formation histories (SFH) of the NSCs of six nearby galaxies with stellar masses ranging between $2$ and $8\\times10^9~{\\rm M_{\\odot}}$ (four late-type spirals and two early-types) with high resolution spectroscopy. Our observations are taken with the X-Shooter spectrograph at the VLT. We make use of an empirical simple stellar population (SSP) model grid to fit composite stellar ","authors_text":"Anil C. Seth, C. Jakob Walcher, Michele Cappellari, Nadine Neumayer, Nikolay Kacharov, Richard McDermid, Torsten B\\\"oker","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-07-23T18:00:28Z","title":"Stellar populations and star formation histories of the nuclear star clusters in six nearby galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.08765","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":"sha256:496eb5f2b0b4c843ede969d87f2fcf0d416cd1db1ba31e2d521fcc47d57d0105","target":"record","created_at":"2026-05-18T00:08:37Z","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":"a518081ab7b865a5677b527cba5a7cb5b8696311d1df2ecb578d28b0130603f0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-07-23T18:00:28Z","title_canon_sha256":"c021739330b42b007f05d5522fedd04dffa0e00e5a2b22c4312b825210479cc3"},"schema_version":"1.0","source":{"id":"1807.08765","kind":"arxiv","version":1}},"canonical_sha256":"bd0f8d237b32f0d26ed8992a4f7f31ef9965305a041bb689c4eb85e9ef220034","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bd0f8d237b32f0d26ed8992a4f7f31ef9965305a041bb689c4eb85e9ef220034","first_computed_at":"2026-05-18T00:08:37.905645Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:08:37.905645Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"k+xJ1Ta58vSFA4RPdlEFVPFsb/t4Pz5xvu+7FrEzJWT0JgQO9rZE9Degh/Z7wIqJE4pgu31AH2nX+PW+D7ldBw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:08:37.906337Z","signed_message":"canonical_sha256_bytes"},"source_id":"1807.08765","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:496eb5f2b0b4c843ede969d87f2fcf0d416cd1db1ba31e2d521fcc47d57d0105","sha256:b50361a941d26df11d2b43bafa47d77e1d7800000201d77ffe14bd1da33472ab"],"state_sha256":"d87fc223672ac4476536498c540386aabb1ec2681fb359611a4db9ed4dc2916c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GqR5wRG+EFj19uGyqIL716dKV1X+jemVSCiL3Gui2Lcc+fDNidbwRKYAJueC4DMkrhXi6pskcrRT1mricSbPDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-08T20:02:11.961216Z","bundle_sha256":"6fc0c2aabfb5387b9f64ef663cb6a5b782c3c3a7aeb564d7334f3ce09c3ff5e9"}}