{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:HV6X4X3ZXGQTSNA5NRGOGHTN36","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":"0111b5764fd30b4f6523c4ff64f4854d3450c1ac24b7061149e9254b476d2ef7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-01-24T19:21:13Z","title_canon_sha256":"81343af6d6467c5621f01a6edf3ce4eae73f54ba7ac0ed94954e39d8b3307121"},"schema_version":"1.0","source":{"id":"1301.5870","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1301.5870","created_at":"2026-05-18T03:11:59Z"},{"alias_kind":"arxiv_version","alias_value":"1301.5870v2","created_at":"2026-05-18T03:11:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1301.5870","created_at":"2026-05-18T03:11:59Z"},{"alias_kind":"pith_short_12","alias_value":"HV6X4X3ZXGQT","created_at":"2026-05-18T12:27:46Z"},{"alias_kind":"pith_short_16","alias_value":"HV6X4X3ZXGQTSNA5","created_at":"2026-05-18T12:27:46Z"},{"alias_kind":"pith_short_8","alias_value":"HV6X4X3Z","created_at":"2026-05-18T12:27:46Z"}],"graph_snapshots":[{"event_id":"sha256:3c6410d6b2e0245fbbc13ac07af1c9911f2d55490d781f7e2087afb169719755","target":"graph","created_at":"2026-05-18T03:11:59Z","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 have devised a method to select galaxies that are isolated in their dark matter halo (N=1 systems) and galaxies that reside in a group of exactly two (N=2 systems). Our N=2 systems are widely-separated (up to $\\sim$\\,200\\,$h^{-1}$\\,kpc), where close galaxy-galaxy interactions are not dominant. We apply our selection criteria to two volume-limited samples of galaxies from SDSS DR6 with $M_{r}-5 \\log_{10} h \\leq$ -19 and -20 to study the effects of the environment of very sparse groups on galaxy colour. For satellite galaxies in a group of two, we find a red excess attributed to star formatio","authors_text":"Andrew R. Zentner, Christopher Q. Trinh, Elizabeth J. Barton, James S. Bullock, Michael C. Cooper, Risa H. Wechsler","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-01-24T19:21:13Z","title":"Groups of two galaxies in SDSS: implications of colours on star formation quenching time-scales"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1301.5870","kind":"arxiv","version":2},"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":"sha256:4527f7abfd64f068f6c54bdf0aea31e03343317bad4dfc929a9f4a2224476301","target":"record","created_at":"2026-05-18T03:11:59Z","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":"0111b5764fd30b4f6523c4ff64f4854d3450c1ac24b7061149e9254b476d2ef7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-01-24T19:21:13Z","title_canon_sha256":"81343af6d6467c5621f01a6edf3ce4eae73f54ba7ac0ed94954e39d8b3307121"},"schema_version":"1.0","source":{"id":"1301.5870","kind":"arxiv","version":2}},"canonical_sha256":"3d7d7e5f79b9a139341d6c4ce31e6ddf9b42f844643f815c532dbcc95b062f5f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3d7d7e5f79b9a139341d6c4ce31e6ddf9b42f844643f815c532dbcc95b062f5f","first_computed_at":"2026-05-18T03:11:59.237781Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:11:59.237781Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"HJV2xkLWKluLWO5zBkOPajhXrNpof3/WQ29gDY3QzYzUX1TpyxGDaR8jdmCOZ27EeIkT4AeqBgsOyWFQCQjiDA==","signature_status":"signed_v1","signed_at":"2026-05-18T03:11:59.238377Z","signed_message":"canonical_sha256_bytes"},"source_id":"1301.5870","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4527f7abfd64f068f6c54bdf0aea31e03343317bad4dfc929a9f4a2224476301","sha256:3c6410d6b2e0245fbbc13ac07af1c9911f2d55490d781f7e2087afb169719755"],"state_sha256":"2137284cf5dda66555393a342a239298f6b7bfb61db66d9014b2d439a92eacd2"}