{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:62T2GGFIRGXFYZA6G3YURIDQKN","short_pith_number":"pith:62T2GGFI","schema_version":"1.0","canonical_sha256":"f6a7a318a889ae5c641e36f148a0705362f4d1ac874c9ec6cbd1f6319ea4d756","source":{"kind":"arxiv","id":"1910.09726","version":2},"attestation_state":"computed","paper":{"title":"Enigmatic Velocity Dispersions of Ultra-Diffuse Galaxies in Light of Modified Gravity Theories and Radial Acceleration Relation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"Tousif Islam","submitted_at":"2019-10-22T02:11:08Z","abstract_excerpt":"Recent observations of anomalous line-of-sight velocity dispersions of two ultra-diffuse galaxies (UDGs) provide a stringent test for modified gravity theories. While NGC 1052-DF2 exhibits an extremely low dispersion value ($\\sigma \\sim 7.8_{-2.2}^{+5.6}$ km/s), the reported dispersion value for NGC 1052-DF44 is quite high ($\\sigma \\sim 41.0 \\pm 8$ km/s). For DF2, the dynamical mass is almost equal to the luminous mass suggesting the galaxy have little to no `dark matter' in $\\Lambda$CDM whereas DF4 requires a dynamical mass-to-light ratio of $\\sim 30$ making it to be almost entirely consists "},"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":"1910.09726","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2019-10-22T02:11:08Z","cross_cats_sorted":[],"title_canon_sha256":"b16d52586f7807f51f4870934cb242418c6bc30f92c6cc783d4f8bed36147e59","abstract_canon_sha256":"33a84b0d1a0a123d322a5fc231b1a64734b62f7ce43a6659800e94229b3f3c46"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:23:55.317784Z","signature_b64":"NT85LbPUgDQpduyn6kAvyUGiq04Ba9nvE8HfWkkdGhZ/f09M+GAJPKwxlKD2AvvwS+iQsKMKsI4EEj2wnlqmDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f6a7a318a889ae5c641e36f148a0705362f4d1ac874c9ec6cbd1f6319ea4d756","last_reissued_at":"2026-07-05T01:23:55.317376Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:23:55.317376Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Enigmatic Velocity Dispersions of Ultra-Diffuse Galaxies in Light of Modified Gravity Theories and Radial Acceleration Relation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"Tousif Islam","submitted_at":"2019-10-22T02:11:08Z","abstract_excerpt":"Recent observations of anomalous line-of-sight velocity dispersions of two ultra-diffuse galaxies (UDGs) provide a stringent test for modified gravity theories. While NGC 1052-DF2 exhibits an extremely low dispersion value ($\\sigma \\sim 7.8_{-2.2}^{+5.6}$ km/s), the reported dispersion value for NGC 1052-DF44 is quite high ($\\sigma \\sim 41.0 \\pm 8$ km/s). For DF2, the dynamical mass is almost equal to the luminous mass suggesting the galaxy have little to no `dark matter' in $\\Lambda$CDM whereas DF4 requires a dynamical mass-to-light ratio of $\\sim 30$ making it to be almost entirely consists "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1910.09726","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1910.09726/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"1910.09726","created_at":"2026-07-05T01:23:55.317433+00:00"},{"alias_kind":"arxiv_version","alias_value":"1910.09726v2","created_at":"2026-07-05T01:23:55.317433+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1910.09726","created_at":"2026-07-05T01:23:55.317433+00:00"},{"alias_kind":"pith_short_12","alias_value":"62T2GGFIRGXF","created_at":"2026-07-05T01:23:55.317433+00:00"},{"alias_kind":"pith_short_16","alias_value":"62T2GGFIRGXFYZA6","created_at":"2026-07-05T01:23:55.317433+00:00"},{"alias_kind":"pith_short_8","alias_value":"62T2GGFI","created_at":"2026-07-05T01:23:55.317433+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2412.03658","citing_title":"Exploring velocity dispersion anisotropy in a dark matter dominated ultra-diffuse galaxy with modified gravity models","ref_index":32,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/62T2GGFIRGXFYZA6G3YURIDQKN","json":"https://pith.science/pith/62T2GGFIRGXFYZA6G3YURIDQKN.json","graph_json":"https://pith.science/api/pith-number/62T2GGFIRGXFYZA6G3YURIDQKN/graph.json","events_json":"https://pith.science/api/pith-number/62T2GGFIRGXFYZA6G3YURIDQKN/events.json","paper":"https://pith.science/paper/62T2GGFI"},"agent_actions":{"view_html":"https://pith.science/pith/62T2GGFIRGXFYZA6G3YURIDQKN","download_json":"https://pith.science/pith/62T2GGFIRGXFYZA6G3YURIDQKN.json","view_paper":"https://pith.science/paper/62T2GGFI","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1910.09726&json=true","fetch_graph":"https://pith.science/api/pith-number/62T2GGFIRGXFYZA6G3YURIDQKN/graph.json","fetch_events":"https://pith.science/api/pith-number/62T2GGFIRGXFYZA6G3YURIDQKN/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/62T2GGFIRGXFYZA6G3YURIDQKN/action/timestamp_anchor","attest_storage":"https://pith.science/pith/62T2GGFIRGXFYZA6G3YURIDQKN/action/storage_attestation","attest_author":"https://pith.science/pith/62T2GGFIRGXFYZA6G3YURIDQKN/action/author_attestation","sign_citation":"https://pith.science/pith/62T2GGFIRGXFYZA6G3YURIDQKN/action/citation_signature","submit_replication":"https://pith.science/pith/62T2GGFIRGXFYZA6G3YURIDQKN/action/replication_record"}},"created_at":"2026-07-05T01:23:55.317433+00:00","updated_at":"2026-07-05T01:23:55.317433+00:00"}