{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:UCSENBX3CRK5RWRS347LF4GYG2","short_pith_number":"pith:UCSENBX3","canonical_record":{"source":{"id":"0904.2851","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-04-18T13:02:36Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"64bd929fc31017ec941cf4a42cab360b57b3b957e961183482114f74bc592d08","abstract_canon_sha256":"a66a205c012ac0a36b7bdb41776738558aa95468342400c069870884c4453ceb"},"schema_version":"1.0"},"canonical_sha256":"a0a44686fb1455d8da32df3eb2f0d836afb2e64d4e05c9e49e15beef03b3f792","source":{"kind":"arxiv","id":"0904.2851","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0904.2851","created_at":"2026-05-18T02:13:59Z"},{"alias_kind":"arxiv_version","alias_value":"0904.2851v2","created_at":"2026-05-18T02:13:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0904.2851","created_at":"2026-05-18T02:13:59Z"},{"alias_kind":"pith_short_12","alias_value":"UCSENBX3CRK5","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"UCSENBX3CRK5RWRS","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"UCSENBX3","created_at":"2026-05-18T12:26:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:UCSENBX3CRK5RWRS347LF4GYG2","target":"record","payload":{"canonical_record":{"source":{"id":"0904.2851","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-04-18T13:02:36Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"64bd929fc31017ec941cf4a42cab360b57b3b957e961183482114f74bc592d08","abstract_canon_sha256":"a66a205c012ac0a36b7bdb41776738558aa95468342400c069870884c4453ceb"},"schema_version":"1.0"},"canonical_sha256":"a0a44686fb1455d8da32df3eb2f0d836afb2e64d4e05c9e49e15beef03b3f792","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:13:59.217403Z","signature_b64":"2zhEYPAR/CNQTIzNOpgyGx47Q5r+LpA0ZBNCcjml6BYuhwv9kAoViZbnXNoxAvsoQY05UmcS4og3vSKKt1dHDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a0a44686fb1455d8da32df3eb2f0d836afb2e64d4e05c9e49e15beef03b3f792","last_reissued_at":"2026-05-18T02:13:59.216543Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:13:59.216543Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0904.2851","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:13:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1wlXeSYJZP7H3KqKGCPQJZZaei/kpfg3li9pb4ywgXVWo339HwhwvWYnBn2gWbV9DVuwMemcHgqIEib4ti1EBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-24T18:47:59.073702Z"},"content_sha256":"02da40ef47f02d4cd421ea0c4e2852047a24a9c52e3f44d9d8323d33e84cab36","schema_version":"1.0","event_id":"sha256:02da40ef47f02d4cd421ea0c4e2852047a24a9c52e3f44d9d8323d33e84cab36"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:UCSENBX3CRK5RWRS347LF4GYG2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Global environmental effects versus galaxy interactions","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.CO","authors_text":"2, 3), 5), 6). ((1)Instituto de Astronomia y Fisica del Espacio, Argentina.), Argentina. (2) Facultad de Ciencias Astronomia y Geofisica, Argentina. (3) Consejo Nacional de Investigaciones Cientificas y Tecnicas, Argentina. (4) Departamento de Astronomia y Astrofisica, Argentina. (6) Observatorio Astronomico de la Universidad Nacional de Cordoba, Chile. (5) Complejo Astronomico El Leoncito, Ciudad de Buenos Aires, CONICET, Diego G. Lambas (3, Josefa Perez (1, M. Sol Alonso (3, Nelson Padilla (4), Patricia Tissera (1, Pontificia Universidad Catolica de Chile, San Juan, Santiago, Universidad Nacional de La Plata","submitted_at":"2009-04-18T13:02:36Z","abstract_excerpt":"We explore properties of close galaxy pairs and merging systems selected from the SDSS-DR4 in different environments with the aim to assess the relative importance of the role of interactions over global environmental processes. For this purpose, we perform a comparative study of galaxies with and without close companions as a function of local density and host-halo mass, carefully removing sources of possible biases. We find that at low and high local density environments, colours and morphologies of close galaxy pairs are very similar to those of isolated galaxies. At intermediate densities,"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0904.2851","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:13:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JeAMabePsHUAuToRzrMd0N12oTSxEtHlsJycM505HRBcoenD68tDR/5PiMQ7U42Ft+kECw4LHl2KEYyTWuBWAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-24T18:47:59.074372Z"},"content_sha256":"6d1070984c311054afbc012de52df1315b59df61b43c3f30ec5e4e2dae0f4d4a","schema_version":"1.0","event_id":"sha256:6d1070984c311054afbc012de52df1315b59df61b43c3f30ec5e4e2dae0f4d4a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UCSENBX3CRK5RWRS347LF4GYG2/bundle.json","state_url":"https://pith.science/pith/UCSENBX3CRK5RWRS347LF4GYG2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UCSENBX3CRK5RWRS347LF4GYG2/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":"2026-05-24T18:47:59Z","links":{"resolver":"https://pith.science/pith/UCSENBX3CRK5RWRS347LF4GYG2","bundle":"https://pith.science/pith/UCSENBX3CRK5RWRS347LF4GYG2/bundle.json","state":"https://pith.science/pith/UCSENBX3CRK5RWRS347LF4GYG2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UCSENBX3CRK5RWRS347LF4GYG2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:UCSENBX3CRK5RWRS347LF4GYG2","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":"a66a205c012ac0a36b7bdb41776738558aa95468342400c069870884c4453ceb","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-04-18T13:02:36Z","title_canon_sha256":"64bd929fc31017ec941cf4a42cab360b57b3b957e961183482114f74bc592d08"},"schema_version":"1.0","source":{"id":"0904.2851","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0904.2851","created_at":"2026-05-18T02:13:59Z"},{"alias_kind":"arxiv_version","alias_value":"0904.2851v2","created_at":"2026-05-18T02:13:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0904.2851","created_at":"2026-05-18T02:13:59Z"},{"alias_kind":"pith_short_12","alias_value":"UCSENBX3CRK5","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"UCSENBX3CRK5RWRS","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"UCSENBX3","created_at":"2026-05-18T12:26:02Z"}],"graph_snapshots":[{"event_id":"sha256:6d1070984c311054afbc012de52df1315b59df61b43c3f30ec5e4e2dae0f4d4a","target":"graph","created_at":"2026-05-18T02:13:59Z","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 explore properties of close galaxy pairs and merging systems selected from the SDSS-DR4 in different environments with the aim to assess the relative importance of the role of interactions over global environmental processes. For this purpose, we perform a comparative study of galaxies with and without close companions as a function of local density and host-halo mass, carefully removing sources of possible biases. We find that at low and high local density environments, colours and morphologies of close galaxy pairs are very similar to those of isolated galaxies. At intermediate densities,","authors_text":"2, 3), 5), 6). ((1)Instituto de Astronomia y Fisica del Espacio, Argentina.), Argentina. (2) Facultad de Ciencias Astronomia y Geofisica, Argentina. (3) Consejo Nacional de Investigaciones Cientificas y Tecnicas, Argentina. (4) Departamento de Astronomia y Astrofisica, Argentina. (6) Observatorio Astronomico de la Universidad Nacional de Cordoba, Chile. (5) Complejo Astronomico El Leoncito, Ciudad de Buenos Aires, CONICET, Diego G. Lambas (3, Josefa Perez (1, M. Sol Alonso (3, Nelson Padilla (4), Patricia Tissera (1, Pontificia Universidad Catolica de Chile, San Juan, Santiago, Universidad Nacional de La Plata","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-04-18T13:02:36Z","title":"Global environmental effects versus galaxy interactions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0904.2851","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":"sha256:02da40ef47f02d4cd421ea0c4e2852047a24a9c52e3f44d9d8323d33e84cab36","target":"record","created_at":"2026-05-18T02:13:59Z","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":"a66a205c012ac0a36b7bdb41776738558aa95468342400c069870884c4453ceb","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-04-18T13:02:36Z","title_canon_sha256":"64bd929fc31017ec941cf4a42cab360b57b3b957e961183482114f74bc592d08"},"schema_version":"1.0","source":{"id":"0904.2851","kind":"arxiv","version":2}},"canonical_sha256":"a0a44686fb1455d8da32df3eb2f0d836afb2e64d4e05c9e49e15beef03b3f792","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a0a44686fb1455d8da32df3eb2f0d836afb2e64d4e05c9e49e15beef03b3f792","first_computed_at":"2026-05-18T02:13:59.216543Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:13:59.216543Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"2zhEYPAR/CNQTIzNOpgyGx47Q5r+LpA0ZBNCcjml6BYuhwv9kAoViZbnXNoxAvsoQY05UmcS4og3vSKKt1dHDg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:13:59.217403Z","signed_message":"canonical_sha256_bytes"},"source_id":"0904.2851","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:02da40ef47f02d4cd421ea0c4e2852047a24a9c52e3f44d9d8323d33e84cab36","sha256:6d1070984c311054afbc012de52df1315b59df61b43c3f30ec5e4e2dae0f4d4a"],"state_sha256":"fd5c74faaa0fe3e96cbdc9cb5fe75bb0331cf5ffe998280005e4edc7ff8c76b7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Y2RlNF7e94WJob6nzNazLw2uGXlFmLqnMimm4c4QpViqw7VvCy7xWCxnSqX/QALfho3JZza+VMp3p6sc0ULMCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-24T18:47:59.078019Z","bundle_sha256":"3e4e9052511014059fd96d4c9c949cb8f3fb55b4ddfbe7e9b42c034d5611c35f"}}