{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:N5INTJJJSJCBF7IOZYNI2IYGWM","short_pith_number":"pith:N5INTJJJ","canonical_record":{"source":{"id":"1803.07577","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-03-20T18:03:54Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"95b7fb408efc51823837959784b02819dce768623cedf02a2c9e9413cb204b94","abstract_canon_sha256":"8d7261720c47940cb472d5b66a9398c38ed4b4657acaea077595048297b5e979"},"schema_version":"1.0"},"canonical_sha256":"6f50d9a529924412fd0ece1a8d2306b316c889f2722ee6d98b20e2072367759b","source":{"kind":"arxiv","id":"1803.07577","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.07577","created_at":"2026-05-18T00:15:55Z"},{"alias_kind":"arxiv_version","alias_value":"1803.07577v1","created_at":"2026-05-18T00:15:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.07577","created_at":"2026-05-18T00:15:55Z"},{"alias_kind":"pith_short_12","alias_value":"N5INTJJJSJCB","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_16","alias_value":"N5INTJJJSJCBF7IO","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_8","alias_value":"N5INTJJJ","created_at":"2026-05-18T12:32:40Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:N5INTJJJSJCBF7IOZYNI2IYGWM","target":"record","payload":{"canonical_record":{"source":{"id":"1803.07577","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-03-20T18:03:54Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"95b7fb408efc51823837959784b02819dce768623cedf02a2c9e9413cb204b94","abstract_canon_sha256":"8d7261720c47940cb472d5b66a9398c38ed4b4657acaea077595048297b5e979"},"schema_version":"1.0"},"canonical_sha256":"6f50d9a529924412fd0ece1a8d2306b316c889f2722ee6d98b20e2072367759b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:15:55.070170Z","signature_b64":"Al87H6nB4GIyBJ3UPi8h9juowc6QzBMur8KUl0XyEFU+oRq1q8vLhs3E+FntWNOLxiEJYo9XFh6ILPjPRjPWDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6f50d9a529924412fd0ece1a8d2306b316c889f2722ee6d98b20e2072367759b","last_reissued_at":"2026-05-18T00:15:55.069451Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:15:55.069451Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1803.07577","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":"2026-05-18T00:15:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5l7D3Fo6SUlpnqdoL/e8wFihGKaKogEAa2wYxfPTYgI4fiXd5gm08MxIuB5wTzvZPE8X2KhYLsD4JFc4QEISBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T14:20:47.763041Z"},"content_sha256":"60d5514d299131d7e26678f486bd05eee6ce8f5f108a0271dbed8b9c9933c2ac","schema_version":"1.0","event_id":"sha256:60d5514d299131d7e26678f486bd05eee6ce8f5f108a0271dbed8b9c9933c2ac"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:N5INTJJJSJCBF7IOZYNI2IYGWM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Stellar Population Properties of Ultracompact Dwarfs in M87: a Mass-metallicity Correlation Connecting Low-metallicity Globular Clusters and Compact Ellipticals","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.GA","authors_text":"Ariane Lancon, Chengze Liu, Eric W. Peng, Hong-Xin Zhang, Jincheng Yu, Joel Roediger, Laura Ferrarese, Matthew A. Taylor, Patrick Cote, Paul Eigenthaler, Pierre-Alain Duc, Roberto P. Munoz, Ruben Sanchez-Janssen, Sungsoon Lim, Thomas H. Puzia","submitted_at":"2018-03-20T18:03:54Z","abstract_excerpt":"We derive stellar population parameters for a representative sample of ultracompact dwarfs (UCDs) and a large sample of massive globular clusters (GCs) with stellar masses $\\gtrsim$ 10$^{6}$ $M_{\\odot}$ in the central galaxy M87 of the Virgo galaxy cluster, based on model fitting to the Lick-index measurements from both the literature and new observations. After necessary spectral stacking of the relatively faint objects in our initial sample of 40 UCDs and 118 GCs, we obtain 30 sets of Lick-index measurements for UCDs and 80 for GCs. The M87 UCDs have ages $\\gtrsim$ 8 Gyr and [$\\alpha$/Fe] $\\"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.07577","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":"2026-05-18T00:15:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mDD/w/qQMzKwErZw4bIj0EDKrzcL6d2KvRjA1uO5jJUPUhO4LTtHFvKcn//sS0EJyApLbmrFhJ1X++MiPeoEBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T14:20:47.763777Z"},"content_sha256":"5f7fcebd414c4e964af363d20dd31d04fe1899bffe712fdf42df7e64ec8a0486","schema_version":"1.0","event_id":"sha256:5f7fcebd414c4e964af363d20dd31d04fe1899bffe712fdf42df7e64ec8a0486"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/N5INTJJJSJCBF7IOZYNI2IYGWM/bundle.json","state_url":"https://pith.science/pith/N5INTJJJSJCBF7IOZYNI2IYGWM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/N5INTJJJSJCBF7IOZYNI2IYGWM/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":"2026-05-25T14:20:47Z","links":{"resolver":"https://pith.science/pith/N5INTJJJSJCBF7IOZYNI2IYGWM","bundle":"https://pith.science/pith/N5INTJJJSJCBF7IOZYNI2IYGWM/bundle.json","state":"https://pith.science/pith/N5INTJJJSJCBF7IOZYNI2IYGWM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/N5INTJJJSJCBF7IOZYNI2IYGWM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:N5INTJJJSJCBF7IOZYNI2IYGWM","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":"8d7261720c47940cb472d5b66a9398c38ed4b4657acaea077595048297b5e979","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-03-20T18:03:54Z","title_canon_sha256":"95b7fb408efc51823837959784b02819dce768623cedf02a2c9e9413cb204b94"},"schema_version":"1.0","source":{"id":"1803.07577","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.07577","created_at":"2026-05-18T00:15:55Z"},{"alias_kind":"arxiv_version","alias_value":"1803.07577v1","created_at":"2026-05-18T00:15:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.07577","created_at":"2026-05-18T00:15:55Z"},{"alias_kind":"pith_short_12","alias_value":"N5INTJJJSJCB","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_16","alias_value":"N5INTJJJSJCBF7IO","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_8","alias_value":"N5INTJJJ","created_at":"2026-05-18T12:32:40Z"}],"graph_snapshots":[{"event_id":"sha256:5f7fcebd414c4e964af363d20dd31d04fe1899bffe712fdf42df7e64ec8a0486","target":"graph","created_at":"2026-05-18T00:15:55Z","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":"We derive stellar population parameters for a representative sample of ultracompact dwarfs (UCDs) and a large sample of massive globular clusters (GCs) with stellar masses $\\gtrsim$ 10$^{6}$ $M_{\\odot}$ in the central galaxy M87 of the Virgo galaxy cluster, based on model fitting to the Lick-index measurements from both the literature and new observations. After necessary spectral stacking of the relatively faint objects in our initial sample of 40 UCDs and 118 GCs, we obtain 30 sets of Lick-index measurements for UCDs and 80 for GCs. The M87 UCDs have ages $\\gtrsim$ 8 Gyr and [$\\alpha$/Fe] $\\","authors_text":"Ariane Lancon, Chengze Liu, Eric W. Peng, Hong-Xin Zhang, Jincheng Yu, Joel Roediger, Laura Ferrarese, Matthew A. Taylor, Patrick Cote, Paul Eigenthaler, Pierre-Alain Duc, Roberto P. Munoz, Ruben Sanchez-Janssen, Sungsoon Lim, Thomas H. Puzia","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-03-20T18:03:54Z","title":"Stellar Population Properties of Ultracompact Dwarfs in M87: a Mass-metallicity Correlation Connecting Low-metallicity Globular Clusters and Compact Ellipticals"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.07577","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":"sha256:60d5514d299131d7e26678f486bd05eee6ce8f5f108a0271dbed8b9c9933c2ac","target":"record","created_at":"2026-05-18T00:15:55Z","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":"8d7261720c47940cb472d5b66a9398c38ed4b4657acaea077595048297b5e979","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-03-20T18:03:54Z","title_canon_sha256":"95b7fb408efc51823837959784b02819dce768623cedf02a2c9e9413cb204b94"},"schema_version":"1.0","source":{"id":"1803.07577","kind":"arxiv","version":1}},"canonical_sha256":"6f50d9a529924412fd0ece1a8d2306b316c889f2722ee6d98b20e2072367759b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6f50d9a529924412fd0ece1a8d2306b316c889f2722ee6d98b20e2072367759b","first_computed_at":"2026-05-18T00:15:55.069451Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:15:55.069451Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Al87H6nB4GIyBJ3UPi8h9juowc6QzBMur8KUl0XyEFU+oRq1q8vLhs3E+FntWNOLxiEJYo9XFh6ILPjPRjPWDg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:15:55.070170Z","signed_message":"canonical_sha256_bytes"},"source_id":"1803.07577","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:60d5514d299131d7e26678f486bd05eee6ce8f5f108a0271dbed8b9c9933c2ac","sha256:5f7fcebd414c4e964af363d20dd31d04fe1899bffe712fdf42df7e64ec8a0486"],"state_sha256":"bc4e1c0a83b0700314ce4c78f4719c4dac7a7466425c7e6fd05cce00f0611a64"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wJh+omPER8zP3g13shOrKh8pXZKhAkDBWKTVeArTQYQOPH1IB+QVR2P77qvMi1TGt7DE86/KzO9qyYfojUMDAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T14:20:47.767579Z","bundle_sha256":"2f4e6b48d276601e1aaafb8d71105eb814bea2c6130c62c9964c96e086f379ed"}}