{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:4CFQ6EFK73GOK7R76427TSJPI6","short_pith_number":"pith:4CFQ6EFK","canonical_record":{"source":{"id":"0908.3138","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-08-21T16:49:30Z","cross_cats_sorted":[],"title_canon_sha256":"1815c5895cbd84dfc8dfe42cff929c0242113bfa3bddcca993e75387819e5665","abstract_canon_sha256":"66d657e86a12a3a944960551baa5ffca38eee1e74b120ae440b5bb5f53b1990a"},"schema_version":"1.0"},"canonical_sha256":"e08b0f10aafecce57e3ff735f9c92f47a6da57cbad947eea6d9e89582a9da32b","source":{"kind":"arxiv","id":"0908.3138","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0908.3138","created_at":"2026-05-18T02:12:24Z"},{"alias_kind":"arxiv_version","alias_value":"0908.3138v1","created_at":"2026-05-18T02:12:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0908.3138","created_at":"2026-05-18T02:12:24Z"},{"alias_kind":"pith_short_12","alias_value":"4CFQ6EFK73GO","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"4CFQ6EFK73GOK7R7","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"4CFQ6EFK","created_at":"2026-05-18T12:25:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:4CFQ6EFK73GOK7R76427TSJPI6","target":"record","payload":{"canonical_record":{"source":{"id":"0908.3138","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-08-21T16:49:30Z","cross_cats_sorted":[],"title_canon_sha256":"1815c5895cbd84dfc8dfe42cff929c0242113bfa3bddcca993e75387819e5665","abstract_canon_sha256":"66d657e86a12a3a944960551baa5ffca38eee1e74b120ae440b5bb5f53b1990a"},"schema_version":"1.0"},"canonical_sha256":"e08b0f10aafecce57e3ff735f9c92f47a6da57cbad947eea6d9e89582a9da32b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:12:24.238796Z","signature_b64":"8OXQTsej3ousIBq0AfM0nrhzhHdOh62Rg+ubSJ5KflNX3kpCl5kMhEXVTVTzm00uQ0AI0S2pXQMNiex99M5ICg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e08b0f10aafecce57e3ff735f9c92f47a6da57cbad947eea6d9e89582a9da32b","last_reissued_at":"2026-05-18T02:12:24.237997Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:12:24.237997Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0908.3138","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:12:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Xs81MYWoerrvXAzT5IlPXnQrF6owwfCIgsC5X5QTvD9VwgQhiQOzCVDBa+o0w3ugqnldC+rX/Kt2p5vwSWBZCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-22T23:58:01.549030Z"},"content_sha256":"d15d2fe06ff304ee21074041a87ab2e53b252929d48bc821ed6ee91c14d4f2b7","schema_version":"1.0","event_id":"sha256:d15d2fe06ff304ee21074041a87ab2e53b252929d48bc821ed6ee91c14d4f2b7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:4CFQ6EFK73GOK7R76427TSJPI6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A study of major mergers using a multi-phase ISM code","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Ch. Theis, J. Weniger, S. Harfst","submitted_at":"2009-08-21T16:49:30Z","abstract_excerpt":"Galaxy interactions are a common phenomenon in clusters of galaxies. Especially major mergers are of particular importance, because they can change the morphological type of galaxies. They have an impact on the mass function of galaxies and they trigger star formation - the main driver of the Galactic Matter Cycle. Therefore, we conducted a study of major mergers by means of a multi-phase ISM code. This code is based on a TREE-SPH-code combined with a sticky particle method allowing for star formation controlled by the properties of a multi-phase ISM. This is in contrast to the usually impleme"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0908.3138","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:12:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"i460ZEKHa0FXENj3jl0b3hOJRPHnMJZjZQQwn6+NzpyNySbqJ7usq+vQpzCkVp8cghXGuLylhPwDZcWf0iBBDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-22T23:58:01.549391Z"},"content_sha256":"6db9eca187a19b567253211b09494d3ce455323a685111d4617f9cd023a4abc9","schema_version":"1.0","event_id":"sha256:6db9eca187a19b567253211b09494d3ce455323a685111d4617f9cd023a4abc9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4CFQ6EFK73GOK7R76427TSJPI6/bundle.json","state_url":"https://pith.science/pith/4CFQ6EFK73GOK7R76427TSJPI6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4CFQ6EFK73GOK7R76427TSJPI6/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-22T23:58:01Z","links":{"resolver":"https://pith.science/pith/4CFQ6EFK73GOK7R76427TSJPI6","bundle":"https://pith.science/pith/4CFQ6EFK73GOK7R76427TSJPI6/bundle.json","state":"https://pith.science/pith/4CFQ6EFK73GOK7R76427TSJPI6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4CFQ6EFK73GOK7R76427TSJPI6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:4CFQ6EFK73GOK7R76427TSJPI6","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":"66d657e86a12a3a944960551baa5ffca38eee1e74b120ae440b5bb5f53b1990a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-08-21T16:49:30Z","title_canon_sha256":"1815c5895cbd84dfc8dfe42cff929c0242113bfa3bddcca993e75387819e5665"},"schema_version":"1.0","source":{"id":"0908.3138","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0908.3138","created_at":"2026-05-18T02:12:24Z"},{"alias_kind":"arxiv_version","alias_value":"0908.3138v1","created_at":"2026-05-18T02:12:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0908.3138","created_at":"2026-05-18T02:12:24Z"},{"alias_kind":"pith_short_12","alias_value":"4CFQ6EFK73GO","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"4CFQ6EFK73GOK7R7","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"4CFQ6EFK","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:6db9eca187a19b567253211b09494d3ce455323a685111d4617f9cd023a4abc9","target":"graph","created_at":"2026-05-18T02:12:24Z","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":"Galaxy interactions are a common phenomenon in clusters of galaxies. Especially major mergers are of particular importance, because they can change the morphological type of galaxies. They have an impact on the mass function of galaxies and they trigger star formation - the main driver of the Galactic Matter Cycle. Therefore, we conducted a study of major mergers by means of a multi-phase ISM code. This code is based on a TREE-SPH-code combined with a sticky particle method allowing for star formation controlled by the properties of a multi-phase ISM. This is in contrast to the usually impleme","authors_text":"Ch. Theis, J. Weniger, S. Harfst","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-08-21T16:49:30Z","title":"A study of major mergers using a multi-phase ISM code"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0908.3138","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:d15d2fe06ff304ee21074041a87ab2e53b252929d48bc821ed6ee91c14d4f2b7","target":"record","created_at":"2026-05-18T02:12:24Z","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":"66d657e86a12a3a944960551baa5ffca38eee1e74b120ae440b5bb5f53b1990a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-08-21T16:49:30Z","title_canon_sha256":"1815c5895cbd84dfc8dfe42cff929c0242113bfa3bddcca993e75387819e5665"},"schema_version":"1.0","source":{"id":"0908.3138","kind":"arxiv","version":1}},"canonical_sha256":"e08b0f10aafecce57e3ff735f9c92f47a6da57cbad947eea6d9e89582a9da32b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e08b0f10aafecce57e3ff735f9c92f47a6da57cbad947eea6d9e89582a9da32b","first_computed_at":"2026-05-18T02:12:24.237997Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:12:24.237997Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8OXQTsej3ousIBq0AfM0nrhzhHdOh62Rg+ubSJ5KflNX3kpCl5kMhEXVTVTzm00uQ0AI0S2pXQMNiex99M5ICg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:12:24.238796Z","signed_message":"canonical_sha256_bytes"},"source_id":"0908.3138","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d15d2fe06ff304ee21074041a87ab2e53b252929d48bc821ed6ee91c14d4f2b7","sha256:6db9eca187a19b567253211b09494d3ce455323a685111d4617f9cd023a4abc9"],"state_sha256":"01062b1ff4b2decb8d8e8cc52e06eb35e9a6adc3a8779cc2c255d17f4b86c3d3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JACkmweQspo6ox9vcgKWE+axiI+Z0NOFE1RuTT0dXSe90H8MjPbGO4WM3Y6VlOXND2Tyrkst1o6/pm0Mp2H/BQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-22T23:58:01.551913Z","bundle_sha256":"2848cc36d7bf5798d918cddaa9984f13f3bb4f6ea646c617a8cb1a12d0a9540b"}}