{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2010:23PR6RV2A6GZJBOV434UAMRQIV","short_pith_number":"pith:23PR6RV2","schema_version":"1.0","canonical_sha256":"d6df1f46ba078d9485d5e6f9403230454579307c48ab496ed59c4ff8e2d3cdf0","source":{"kind":"arxiv","id":"1010.0679","version":2},"attestation_state":"computed","paper":{"title":"Does M31 result from an ancient major merger?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"2), Chinese Academy of Sciences (NAOC)), F. Hammer (1), H. Flores (1), J. L. Wang (1, M. Puech (1), Observatoire de Paris (2) National Astronomical Observatories, S. Fouquet (1) ((1) Laboratoire GEPI, Y. B. Yang (2)","submitted_at":"2010-10-04T20:00:06Z","abstract_excerpt":"The numerous streams in the M31 halo are currently assumed to be due to multiple minor mergers. Here we use the GADGET2 simulation code to test whether M31 could have experienced a major merger in its past history. It results that a 3+/-0.5:1 gaseous rich merger with r(per)=25+/-5 kpc and a polar orbit can explain many properties of M31 and of its halo. The interaction and the fusion may have begun 8.75+/-0.35 Gyr and 5.5 +/-0.5 Gyr ago, respectively. With an almost quiescent star formation history before the fusion we retrieve fractions of bulge, thin and thick disks as well as relative fract"},"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":"1010.0679","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2010-10-04T20:00:06Z","cross_cats_sorted":[],"title_canon_sha256":"601ec43d312ae27d9bcc8d4946d3398519b1409c125644e3c1bedf0cdbcce87a","abstract_canon_sha256":"d00d523a8298427d12ab9214961f12fb3580722279badda2f19ecfad5f9aaaa2"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:05:11.726808Z","signature_b64":"KrQ21PlJSnM6wFDRM6AijigwUSxhu98QDNwraJW/Mn3pdZPrMyB7BVM1WrYywoWGUOoF+FIj+h3b2ykQ6uzDAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d6df1f46ba078d9485d5e6f9403230454579307c48ab496ed59c4ff8e2d3cdf0","last_reissued_at":"2026-05-18T02:05:11.726117Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:05:11.726117Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Does M31 result from an ancient major merger?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"2), Chinese Academy of Sciences (NAOC)), F. Hammer (1), H. Flores (1), J. L. Wang (1, M. Puech (1), Observatoire de Paris (2) National Astronomical Observatories, S. Fouquet (1) ((1) Laboratoire GEPI, Y. B. Yang (2)","submitted_at":"2010-10-04T20:00:06Z","abstract_excerpt":"The numerous streams in the M31 halo are currently assumed to be due to multiple minor mergers. Here we use the GADGET2 simulation code to test whether M31 could have experienced a major merger in its past history. It results that a 3+/-0.5:1 gaseous rich merger with r(per)=25+/-5 kpc and a polar orbit can explain many properties of M31 and of its halo. The interaction and the fusion may have begun 8.75+/-0.35 Gyr and 5.5 +/-0.5 Gyr ago, respectively. With an almost quiescent star formation history before the fusion we retrieve fractions of bulge, thin and thick disks as well as relative fract"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1010.0679","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":""},"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":"1010.0679","created_at":"2026-05-18T02:05:11.726211+00:00"},{"alias_kind":"arxiv_version","alias_value":"1010.0679v2","created_at":"2026-05-18T02:05:11.726211+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1010.0679","created_at":"2026-05-18T02:05:11.726211+00:00"},{"alias_kind":"pith_short_12","alias_value":"23PR6RV2A6GZ","created_at":"2026-05-18T12:26:03.138858+00:00"},{"alias_kind":"pith_short_16","alias_value":"23PR6RV2A6GZJBOV","created_at":"2026-05-18T12:26:03.138858+00:00"},{"alias_kind":"pith_short_8","alias_value":"23PR6RV2","created_at":"2026-05-18T12:26:03.138858+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/23PR6RV2A6GZJBOV434UAMRQIV","json":"https://pith.science/pith/23PR6RV2A6GZJBOV434UAMRQIV.json","graph_json":"https://pith.science/api/pith-number/23PR6RV2A6GZJBOV434UAMRQIV/graph.json","events_json":"https://pith.science/api/pith-number/23PR6RV2A6GZJBOV434UAMRQIV/events.json","paper":"https://pith.science/paper/23PR6RV2"},"agent_actions":{"view_html":"https://pith.science/pith/23PR6RV2A6GZJBOV434UAMRQIV","download_json":"https://pith.science/pith/23PR6RV2A6GZJBOV434UAMRQIV.json","view_paper":"https://pith.science/paper/23PR6RV2","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1010.0679&json=true","fetch_graph":"https://pith.science/api/pith-number/23PR6RV2A6GZJBOV434UAMRQIV/graph.json","fetch_events":"https://pith.science/api/pith-number/23PR6RV2A6GZJBOV434UAMRQIV/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/23PR6RV2A6GZJBOV434UAMRQIV/action/timestamp_anchor","attest_storage":"https://pith.science/pith/23PR6RV2A6GZJBOV434UAMRQIV/action/storage_attestation","attest_author":"https://pith.science/pith/23PR6RV2A6GZJBOV434UAMRQIV/action/author_attestation","sign_citation":"https://pith.science/pith/23PR6RV2A6GZJBOV434UAMRQIV/action/citation_signature","submit_replication":"https://pith.science/pith/23PR6RV2A6GZJBOV434UAMRQIV/action/replication_record"}},"created_at":"2026-05-18T02:05:11.726211+00:00","updated_at":"2026-05-18T02:05:11.726211+00:00"}