{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2016:Y3ZU3QF63MWPFEVUQCYEXF7ZUO","short_pith_number":"pith:Y3ZU3QF6","schema_version":"1.0","canonical_sha256":"c6f34dc0bedb2cf292b480b04b97f9a3b8e6f9d70c48425c9a6f752fddb701cc","source":{"kind":"arxiv","id":"1612.06398","version":1},"attestation_state":"computed","paper":{"title":"Crater 2: An Extremely Cold Dark Matter Halo","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Alex Geringer-Sameth (CMU), Christian I. Johnson (CfA), Edward W. Olszewski (UA), Gabriel Torrealba (IoA), Mario Mateo (UM), Matthew G. Walker (CMU), Nelson Caldwell (CfA), Sergey Koposov (IoA), Vasily Belokurov (IoA)","submitted_at":"2016-12-19T21:00:04Z","abstract_excerpt":"We present results from MMT/Hectochelle spectroscopy of red giant candidate stars along the line of sight to the recently-discovered Galactic satellite Crater 2. Modelling the joint distribution of stellar positions, velocities and metallicities as a mixture of Crater 2 and Galactic foreground populations, we identify 62 members of Crater 2, for which we resolve line-of-sight velocity dispersion 2.7 +/- 0.3 km/s about mean velocity of 87.5 +/- 0.4 km/s. We also resolve a metallicity dispersion 0.22 about a mean of [Fe/H]=-1.98 +/- 0.1 that is 0.28 +/- 0.14 poorer than is estimated from photome"},"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":"1612.06398","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-12-19T21:00:04Z","cross_cats_sorted":[],"title_canon_sha256":"684c4087f87b1e1fee1f5120449d9e3f271fce21bdf105d02b35bccb4c12fcaa","abstract_canon_sha256":"ef22ddec875fa3b08da0acbdcd25e6d8b5ab0c5236cd8a9bde2d0ca704f96a44"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:46:13.428263Z","signature_b64":"oRXdper2+gY+r/Ew7ybmjoDcbe1UGBcusX5aYV7MnFjIj8xYxwck10t+8GdCOhvsoXaxIF7/Lp0GMmZjRKVIAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c6f34dc0bedb2cf292b480b04b97f9a3b8e6f9d70c48425c9a6f752fddb701cc","last_reissued_at":"2026-05-18T00:46:13.427672Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:46:13.427672Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Crater 2: An Extremely Cold Dark Matter Halo","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Alex Geringer-Sameth (CMU), Christian I. Johnson (CfA), Edward W. Olszewski (UA), Gabriel Torrealba (IoA), Mario Mateo (UM), Matthew G. Walker (CMU), Nelson Caldwell (CfA), Sergey Koposov (IoA), Vasily Belokurov (IoA)","submitted_at":"2016-12-19T21:00:04Z","abstract_excerpt":"We present results from MMT/Hectochelle spectroscopy of red giant candidate stars along the line of sight to the recently-discovered Galactic satellite Crater 2. Modelling the joint distribution of stellar positions, velocities and metallicities as a mixture of Crater 2 and Galactic foreground populations, we identify 62 members of Crater 2, for which we resolve line-of-sight velocity dispersion 2.7 +/- 0.3 km/s about mean velocity of 87.5 +/- 0.4 km/s. We also resolve a metallicity dispersion 0.22 about a mean of [Fe/H]=-1.98 +/- 0.1 that is 0.28 +/- 0.14 poorer than is estimated from photome"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1612.06398","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":"1612.06398","created_at":"2026-05-18T00:46:13.427778+00:00"},{"alias_kind":"arxiv_version","alias_value":"1612.06398v1","created_at":"2026-05-18T00:46:13.427778+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1612.06398","created_at":"2026-05-18T00:46:13.427778+00:00"},{"alias_kind":"pith_short_12","alias_value":"Y3ZU3QF63MWP","created_at":"2026-05-18T12:30:51.357362+00:00"},{"alias_kind":"pith_short_16","alias_value":"Y3ZU3QF63MWPFEVU","created_at":"2026-05-18T12:30:51.357362+00:00"},{"alias_kind":"pith_short_8","alias_value":"Y3ZU3QF6","created_at":"2026-05-18T12:30:51.357362+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/Y3ZU3QF63MWPFEVUQCYEXF7ZUO","json":"https://pith.science/pith/Y3ZU3QF63MWPFEVUQCYEXF7ZUO.json","graph_json":"https://pith.science/api/pith-number/Y3ZU3QF63MWPFEVUQCYEXF7ZUO/graph.json","events_json":"https://pith.science/api/pith-number/Y3ZU3QF63MWPFEVUQCYEXF7ZUO/events.json","paper":"https://pith.science/paper/Y3ZU3QF6"},"agent_actions":{"view_html":"https://pith.science/pith/Y3ZU3QF63MWPFEVUQCYEXF7ZUO","download_json":"https://pith.science/pith/Y3ZU3QF63MWPFEVUQCYEXF7ZUO.json","view_paper":"https://pith.science/paper/Y3ZU3QF6","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1612.06398&json=true","fetch_graph":"https://pith.science/api/pith-number/Y3ZU3QF63MWPFEVUQCYEXF7ZUO/graph.json","fetch_events":"https://pith.science/api/pith-number/Y3ZU3QF63MWPFEVUQCYEXF7ZUO/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/Y3ZU3QF63MWPFEVUQCYEXF7ZUO/action/timestamp_anchor","attest_storage":"https://pith.science/pith/Y3ZU3QF63MWPFEVUQCYEXF7ZUO/action/storage_attestation","attest_author":"https://pith.science/pith/Y3ZU3QF63MWPFEVUQCYEXF7ZUO/action/author_attestation","sign_citation":"https://pith.science/pith/Y3ZU3QF63MWPFEVUQCYEXF7ZUO/action/citation_signature","submit_replication":"https://pith.science/pith/Y3ZU3QF63MWPFEVUQCYEXF7ZUO/action/replication_record"}},"created_at":"2026-05-18T00:46:13.427778+00:00","updated_at":"2026-05-18T00:46:13.427778+00:00"}