{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2016:JU4DDCUEKQUUEQRE77FBOGS2VG","short_pith_number":"pith:JU4DDCUE","schema_version":"1.0","canonical_sha256":"4d38318a845429424224ffca171a5aa9b7fedc4ae7d52c206993f5cf6ceeb049","source":{"kind":"arxiv","id":"1601.01690","version":1},"attestation_state":"computed","paper":{"title":"A Comprehensive Archival Chandra Search for X-ray Emission from Ultracompact Dwarf Galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Jenny E. Greene (Princeton), John Mulchaey (Carnegie Observatories), Viraj Pandya (Princeton)","submitted_at":"2016-01-07T21:00:06Z","abstract_excerpt":"We present the first comprehensive archival study of the X-ray properties of ultracompact dwarf (UCD) galaxies, with the goal of identifying weakly-accreting central black holes in UCDs. Our study spans 578 UCDs distributed across thirteen different host systems, including clusters, groups, fossil groups, and isolated galaxies. Of the 336 spectroscopically-confirmed UCDs with usable archival Chandra imaging observations, 21 are X-ray-detected. Imposing a completeness limit of $L_X>2\\times10^{38}$ erg s$^{-1}$, the global X-ray detection fraction for the UCD population is $\\sim3\\%$. Of the 21 X"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1601.01690","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-01-07T21:00:06Z","cross_cats_sorted":[],"title_canon_sha256":"b865d2452539f5640927c1d547b8c19542be4a5119989609e32c6aeb67dcb9ea","abstract_canon_sha256":"cf611447f7211711b4a5c8e54352d90294169828804268e41338cf00a0433dbd"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:18:38.590645Z","signature_b64":"e9eKHEfnVGNll/NVzIG1rCE3nNZW0uomtTxxVdXYbdpjwHETMEHBTaejnkbZrwkLJjHDefY/SFrPtj9G/XMUAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4d38318a845429424224ffca171a5aa9b7fedc4ae7d52c206993f5cf6ceeb049","last_reissued_at":"2026-05-18T01:18:38.590021Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:18:38.590021Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"A Comprehensive Archival Chandra Search for X-ray Emission from Ultracompact Dwarf Galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Jenny E. Greene (Princeton), John Mulchaey (Carnegie Observatories), Viraj Pandya (Princeton)","submitted_at":"2016-01-07T21:00:06Z","abstract_excerpt":"We present the first comprehensive archival study of the X-ray properties of ultracompact dwarf (UCD) galaxies, with the goal of identifying weakly-accreting central black holes in UCDs. Our study spans 578 UCDs distributed across thirteen different host systems, including clusters, groups, fossil groups, and isolated galaxies. Of the 336 spectroscopically-confirmed UCDs with usable archival Chandra imaging observations, 21 are X-ray-detected. Imposing a completeness limit of $L_X>2\\times10^{38}$ erg s$^{-1}$, the global X-ray detection fraction for the UCD population is $\\sim3\\%$. Of the 21 X"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1601.01690","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1601.01690","created_at":"2026-05-18T01:18:38.590124+00:00"},{"alias_kind":"arxiv_version","alias_value":"1601.01690v1","created_at":"2026-05-18T01:18:38.590124+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1601.01690","created_at":"2026-05-18T01:18:38.590124+00:00"},{"alias_kind":"pith_short_12","alias_value":"JU4DDCUEKQUU","created_at":"2026-05-18T12:30:25.849896+00:00"},{"alias_kind":"pith_short_16","alias_value":"JU4DDCUEKQUUEQRE","created_at":"2026-05-18T12:30:25.849896+00:00"},{"alias_kind":"pith_short_8","alias_value":"JU4DDCUE","created_at":"2026-05-18T12:30:25.849896+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/JU4DDCUEKQUUEQRE77FBOGS2VG","json":"https://pith.science/pith/JU4DDCUEKQUUEQRE77FBOGS2VG.json","graph_json":"https://pith.science/api/pith-number/JU4DDCUEKQUUEQRE77FBOGS2VG/graph.json","events_json":"https://pith.science/api/pith-number/JU4DDCUEKQUUEQRE77FBOGS2VG/events.json","paper":"https://pith.science/paper/JU4DDCUE"},"agent_actions":{"view_html":"https://pith.science/pith/JU4DDCUEKQUUEQRE77FBOGS2VG","download_json":"https://pith.science/pith/JU4DDCUEKQUUEQRE77FBOGS2VG.json","view_paper":"https://pith.science/paper/JU4DDCUE","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1601.01690&json=true","fetch_graph":"https://pith.science/api/pith-number/JU4DDCUEKQUUEQRE77FBOGS2VG/graph.json","fetch_events":"https://pith.science/api/pith-number/JU4DDCUEKQUUEQRE77FBOGS2VG/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/JU4DDCUEKQUUEQRE77FBOGS2VG/action/timestamp_anchor","attest_storage":"https://pith.science/pith/JU4DDCUEKQUUEQRE77FBOGS2VG/action/storage_attestation","attest_author":"https://pith.science/pith/JU4DDCUEKQUUEQRE77FBOGS2VG/action/author_attestation","sign_citation":"https://pith.science/pith/JU4DDCUEKQUUEQRE77FBOGS2VG/action/citation_signature","submit_replication":"https://pith.science/pith/JU4DDCUEKQUUEQRE77FBOGS2VG/action/replication_record"}},"created_at":"2026-05-18T01:18:38.590124+00:00","updated_at":"2026-05-18T01:18:38.590124+00:00"}