{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:YRT7M7QL4HSHV5B2O32LCTETTE","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":"57071192573105a88aa12b34bf7215ecf5828cf122a55c682ed0be8973701746","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-08-28T20:10:35Z","title_canon_sha256":"b5bd6a10fe890cd6a7bc53dd38908512d090c68bab12a5651dd05c30dedf779a"},"schema_version":"1.0","source":{"id":"1508.07334","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1508.07334","created_at":"2026-05-18T01:30:22Z"},{"alias_kind":"arxiv_version","alias_value":"1508.07334v1","created_at":"2026-05-18T01:30:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1508.07334","created_at":"2026-05-18T01:30:22Z"},{"alias_kind":"pith_short_12","alias_value":"YRT7M7QL4HSH","created_at":"2026-05-18T12:29:52Z"},{"alias_kind":"pith_short_16","alias_value":"YRT7M7QL4HSHV5B2","created_at":"2026-05-18T12:29:52Z"},{"alias_kind":"pith_short_8","alias_value":"YRT7M7QL","created_at":"2026-05-18T12:29:52Z"}],"graph_snapshots":[{"event_id":"sha256:44fe0554b43bcf38f8d4c22d9afae6c02af450a6ff11e12eeb210fb28674bd3e","target":"graph","created_at":"2026-05-18T01:30:22Z","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 use imaging from the Next Generation Virgo cluster Survey (NGVS) to present a comparative study of ultra-compact dwarf (UCD) galaxies associated with three prominent Virgo sub-clusters: those centered on the massive, red-sequence galaxies M87, M49 and M60. We show how UCDs can be selected with high completeness using a combination of half-light radius and location in color-color diagrams ($u^*iK_s$ or $u^*gz$). Although the central galaxies in each of these sub-clusters have nearly identical luminosities and stellar masses, we find large differences in the sizes of their UCD populations, wi","authors_text":"Alessandro Boselli, Andres Jordan, Ariane Lancon, Chengze Liu, Eric W. Peng, Haiguang Xu, Hong-Xin Zhang, J. Christopher Mihos, Jean-Charles Cuillandre, John P. Blakeslee, Laura Ferrarese, Lauren A. MacArthur, Patrick Cote, Patrick R. Durrell, Pierre-Alain Duc, Puragra Guhathakurta, Roberto P. Munoz, Ruben Sanchez-Janssen, Simona Mei, Stephen Gwyn, Thomas H. Puzia","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-08-28T20:10:35Z","title":"The Next Generation Virgo Cluster Survey. X. Properties of Ultra-Compact Dwarfs in the M87, M49 and M60 Regions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1508.07334","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":"sha256:60cde97fe6bb35a3365a143850faa30287d3496c09cf1a2152c69eab5ef57526","target":"record","created_at":"2026-05-18T01:30:22Z","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":"57071192573105a88aa12b34bf7215ecf5828cf122a55c682ed0be8973701746","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-08-28T20:10:35Z","title_canon_sha256":"b5bd6a10fe890cd6a7bc53dd38908512d090c68bab12a5651dd05c30dedf779a"},"schema_version":"1.0","source":{"id":"1508.07334","kind":"arxiv","version":1}},"canonical_sha256":"c467f67e0be1e47af43a76f4b14c93993eae1a15d42e389daf44bfe553b14298","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c467f67e0be1e47af43a76f4b14c93993eae1a15d42e389daf44bfe553b14298","first_computed_at":"2026-05-18T01:30:22.983094Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:30:22.983094Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"sdAUa/kz0tFdh1fugMKVL02SBlTnodFBhQ20pao4jJjKuZW0yXDoYaVZNMvZPqrVfoAhkDcQhp1iojjZ52htDA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:30:22.983631Z","signed_message":"canonical_sha256_bytes"},"source_id":"1508.07334","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:60cde97fe6bb35a3365a143850faa30287d3496c09cf1a2152c69eab5ef57526","sha256:44fe0554b43bcf38f8d4c22d9afae6c02af450a6ff11e12eeb210fb28674bd3e"],"state_sha256":"70f3b082d1cab1099539fb0ae9ddfb02ecc79691e66843ef597661d35c604d94"}