{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:WWXKPQRMYKIK2NQUJ26OGALYZ4","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":"0450f706e87c3d8f863426092b926abe76717f54d9f5368f3d86cffcbf47923a","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-09-17T15:18:54Z","title_canon_sha256":"b02acdf18a64b51bad5d57b7564de1c721f510280e8eaa6d1a298c2c58ed63c1"},"schema_version":"1.0","source":{"id":"1509.05287","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.05287","created_at":"2026-05-18T01:32:44Z"},{"alias_kind":"arxiv_version","alias_value":"1509.05287v1","created_at":"2026-05-18T01:32:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.05287","created_at":"2026-05-18T01:32:44Z"},{"alias_kind":"pith_short_12","alias_value":"WWXKPQRMYKIK","created_at":"2026-05-18T12:29:47Z"},{"alias_kind":"pith_short_16","alias_value":"WWXKPQRMYKIK2NQU","created_at":"2026-05-18T12:29:47Z"},{"alias_kind":"pith_short_8","alias_value":"WWXKPQRM","created_at":"2026-05-18T12:29:47Z"}],"graph_snapshots":[{"event_id":"sha256:625d04d6f4971cdac348345499c31f76d5e00e01320ea4411901fffa8a33bf74","target":"graph","created_at":"2026-05-18T01:32:44Z","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 present the results of SPH simulations in which two clouds, each having mass $M_{_{\\rm{o}}}\\!=\\!500\\,{\\rm M}_{_\\odot}$ and radius $R_{_{\\rm{o}}}\\!=\\!2\\,{\\rm pc}$, collide head-on at relative velocities of $\\Delta v_{_{\\rm{o}}} =2.4,\\;2.8,\\;3.2,\\;3.6\\;{\\rm and}\\;4.0\\,{\\rm km}\\,{\\rm s}^{-1}$. There is a clear trend with increasing $\\Delta v_{_{\\rm{o}}}$. At low $\\Delta v_{_{\\rm{o}}}$, star formation starts later, and the shock-compressed layer breaks up into an array of predominantly radial filaments; stars condense out of these filaments and fall, together with residual gas, towards the cent","authors_text":"A. P. Whitworth, D. A. Hubber, S. E. Jaffa, S. K. Balfour","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-09-17T15:18:54Z","title":"Star Formation triggered by cloud-cloud collisions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.05287","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:a2a9ebf2989c7c6583c63a36d9bc0a1ed3e81b50cd26fa69c2ad6fe6ca0c15b7","target":"record","created_at":"2026-05-18T01:32:44Z","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":"0450f706e87c3d8f863426092b926abe76717f54d9f5368f3d86cffcbf47923a","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-09-17T15:18:54Z","title_canon_sha256":"b02acdf18a64b51bad5d57b7564de1c721f510280e8eaa6d1a298c2c58ed63c1"},"schema_version":"1.0","source":{"id":"1509.05287","kind":"arxiv","version":1}},"canonical_sha256":"b5aea7c22cc290ad36144ebce30178cf087f0bf65b62bc503a99648b66160fc9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b5aea7c22cc290ad36144ebce30178cf087f0bf65b62bc503a99648b66160fc9","first_computed_at":"2026-05-18T01:32:44.228763Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:32:44.228763Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tmIWpFdInccO2ORfboJew69x2J+vvYhYYWfr5f3hmPsNxggG4EsSA0aeupzRep6MZL24qWc550+IprmzxclxAA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:32:44.229136Z","signed_message":"canonical_sha256_bytes"},"source_id":"1509.05287","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a2a9ebf2989c7c6583c63a36d9bc0a1ed3e81b50cd26fa69c2ad6fe6ca0c15b7","sha256:625d04d6f4971cdac348345499c31f76d5e00e01320ea4411901fffa8a33bf74"],"state_sha256":"c42650fa58bc5de4b99ad4cb6a927a2f78d25e8796d0cb3c271fbe87c0635048"}