{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:2ICDWHZ3ZYMLSV2DTPBS4UJMHV","short_pith_number":"pith:2ICDWHZ3","canonical_record":{"source":{"id":"0907.3728","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-07-21T20:21:07Z","cross_cats_sorted":[],"title_canon_sha256":"e7d3666e7f74cdbeaed665ed7e400790525555b0f9818ac21c61721727400aa2","abstract_canon_sha256":"fb57e534d53f2d911de8ba0be4653abd29d706977f7e171da3146aa851d1c458"},"schema_version":"1.0"},"canonical_sha256":"d2043b1f3bce18b957439bc32e512c3d7be4be2d2a6e17f41f00d0eae7f6df0a","source":{"kind":"arxiv","id":"0907.3728","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0907.3728","created_at":"2026-05-18T02:12:54Z"},{"alias_kind":"arxiv_version","alias_value":"0907.3728v1","created_at":"2026-05-18T02:12:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0907.3728","created_at":"2026-05-18T02:12:54Z"},{"alias_kind":"pith_short_12","alias_value":"2ICDWHZ3ZYML","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"2ICDWHZ3ZYMLSV2D","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"2ICDWHZ3","created_at":"2026-05-18T12:25:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:2ICDWHZ3ZYMLSV2DTPBS4UJMHV","target":"record","payload":{"canonical_record":{"source":{"id":"0907.3728","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-07-21T20:21:07Z","cross_cats_sorted":[],"title_canon_sha256":"e7d3666e7f74cdbeaed665ed7e400790525555b0f9818ac21c61721727400aa2","abstract_canon_sha256":"fb57e534d53f2d911de8ba0be4653abd29d706977f7e171da3146aa851d1c458"},"schema_version":"1.0"},"canonical_sha256":"d2043b1f3bce18b957439bc32e512c3d7be4be2d2a6e17f41f00d0eae7f6df0a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:12:54.933422Z","signature_b64":"jZqTcFLw4R8OnXXsBDSR2i69S3x8BeJb+4Fw/5kTztz13AQ5Pre1laYNXfaw2SxmVDV6q+ucGALSz01RZ3SjBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d2043b1f3bce18b957439bc32e512c3d7be4be2d2a6e17f41f00d0eae7f6df0a","last_reissued_at":"2026-05-18T02:12:54.932859Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:12:54.932859Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0907.3728","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":"2026-05-18T02:12:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1bvFQa31HKd/902JoTkkTKvk3qhAtIFQsFKHs/H2YdBX8imwggvZMtmDg1IGlERAR++JYuy13cWyyC0SuSQcCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T13:30:43.442138Z"},"content_sha256":"b6c591757f567a5c38c5d0fad247292fea2b1aa73b1d412c0be9466239a1833e","schema_version":"1.0","event_id":"sha256:b6c591757f567a5c38c5d0fad247292fea2b1aa73b1d412c0be9466239a1833e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:2ICDWHZ3ZYMLSV2DTPBS4UJMHV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Less than 10 percent of star formation in z=0.6 massive galaxies is triggered by major interactions","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Aday R. Robaina, Andy Taylor, Anna Gallazzi, Asmus Boehm, Boris Haussler, Casey Papovich, Catherine Heymans, Chien Y. Peng, Christian Wolf, Daniel H. McIntosh, David Bacon, Eelco van Kampen, Eric F. Bell, Fabio D. Barazza, Hans-Walter Rix, John A.R. Caldwell, Klaus Meisenheimer, Knud Jahnke, Kyle Lane, Lutz Wisotzki, Marco Barden, Meghan E. Gray, Michael Balogh, Rachel S. Somerville, Ramin Skibba, Rosalind E. Skelton, Sebastian F. Sanchez, Shardha Jogee, Xianzhong Zheng","submitted_at":"2009-07-21T20:21:07Z","abstract_excerpt":"Both observations and simulations show that major tidal interactions or mergers between gas-rich galaxies can lead to intense bursts of starformation. Yet, the average enhancement in star formation rate (SFR) in major mergers and the contribution of such events to the cosmic SFR are not well estimated. Here we use photometric redshifts, stellar masses and UV SFRs from COMBO-17, 24 micron SFRs from Spitzer and morphologies from two deep HST cosmological survey fields (ECDFS/GEMS and A901/STAGES) to study the enhancement in SFR as a function of projected galaxy separation. We apply two-point pro"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0907.3728","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":"2026-05-18T02:12:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2vW141CJUR8HHUu/z88wdvnYSP1n6L0a8ayZntv7NhvFylq/IylwhVh0VEgec9xvp6II0dpBjZm4cxGaK+ptBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T13:30:43.442990Z"},"content_sha256":"8ead456e36ed6c1553d206209b5cfa0584c349fe7b541042b6da7a8bfc1d3bba","schema_version":"1.0","event_id":"sha256:8ead456e36ed6c1553d206209b5cfa0584c349fe7b541042b6da7a8bfc1d3bba"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2ICDWHZ3ZYMLSV2DTPBS4UJMHV/bundle.json","state_url":"https://pith.science/pith/2ICDWHZ3ZYMLSV2DTPBS4UJMHV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2ICDWHZ3ZYMLSV2DTPBS4UJMHV/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":"2026-05-31T13:30:43Z","links":{"resolver":"https://pith.science/pith/2ICDWHZ3ZYMLSV2DTPBS4UJMHV","bundle":"https://pith.science/pith/2ICDWHZ3ZYMLSV2DTPBS4UJMHV/bundle.json","state":"https://pith.science/pith/2ICDWHZ3ZYMLSV2DTPBS4UJMHV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2ICDWHZ3ZYMLSV2DTPBS4UJMHV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:2ICDWHZ3ZYMLSV2DTPBS4UJMHV","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":"fb57e534d53f2d911de8ba0be4653abd29d706977f7e171da3146aa851d1c458","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-07-21T20:21:07Z","title_canon_sha256":"e7d3666e7f74cdbeaed665ed7e400790525555b0f9818ac21c61721727400aa2"},"schema_version":"1.0","source":{"id":"0907.3728","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0907.3728","created_at":"2026-05-18T02:12:54Z"},{"alias_kind":"arxiv_version","alias_value":"0907.3728v1","created_at":"2026-05-18T02:12:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0907.3728","created_at":"2026-05-18T02:12:54Z"},{"alias_kind":"pith_short_12","alias_value":"2ICDWHZ3ZYML","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"2ICDWHZ3ZYMLSV2D","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"2ICDWHZ3","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:8ead456e36ed6c1553d206209b5cfa0584c349fe7b541042b6da7a8bfc1d3bba","target":"graph","created_at":"2026-05-18T02:12:54Z","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":"Both observations and simulations show that major tidal interactions or mergers between gas-rich galaxies can lead to intense bursts of starformation. Yet, the average enhancement in star formation rate (SFR) in major mergers and the contribution of such events to the cosmic SFR are not well estimated. Here we use photometric redshifts, stellar masses and UV SFRs from COMBO-17, 24 micron SFRs from Spitzer and morphologies from two deep HST cosmological survey fields (ECDFS/GEMS and A901/STAGES) to study the enhancement in SFR as a function of projected galaxy separation. We apply two-point pro","authors_text":"Aday R. Robaina, Andy Taylor, Anna Gallazzi, Asmus Boehm, Boris Haussler, Casey Papovich, Catherine Heymans, Chien Y. Peng, Christian Wolf, Daniel H. McIntosh, David Bacon, Eelco van Kampen, Eric F. Bell, Fabio D. Barazza, Hans-Walter Rix, John A.R. Caldwell, Klaus Meisenheimer, Knud Jahnke, Kyle Lane, Lutz Wisotzki, Marco Barden, Meghan E. Gray, Michael Balogh, Rachel S. Somerville, Ramin Skibba, Rosalind E. Skelton, Sebastian F. Sanchez, Shardha Jogee, Xianzhong Zheng","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-07-21T20:21:07Z","title":"Less than 10 percent of star formation in z=0.6 massive galaxies is triggered by major interactions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0907.3728","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:b6c591757f567a5c38c5d0fad247292fea2b1aa73b1d412c0be9466239a1833e","target":"record","created_at":"2026-05-18T02:12:54Z","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":"fb57e534d53f2d911de8ba0be4653abd29d706977f7e171da3146aa851d1c458","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-07-21T20:21:07Z","title_canon_sha256":"e7d3666e7f74cdbeaed665ed7e400790525555b0f9818ac21c61721727400aa2"},"schema_version":"1.0","source":{"id":"0907.3728","kind":"arxiv","version":1}},"canonical_sha256":"d2043b1f3bce18b957439bc32e512c3d7be4be2d2a6e17f41f00d0eae7f6df0a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d2043b1f3bce18b957439bc32e512c3d7be4be2d2a6e17f41f00d0eae7f6df0a","first_computed_at":"2026-05-18T02:12:54.932859Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:12:54.932859Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"jZqTcFLw4R8OnXXsBDSR2i69S3x8BeJb+4Fw/5kTztz13AQ5Pre1laYNXfaw2SxmVDV6q+ucGALSz01RZ3SjBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:12:54.933422Z","signed_message":"canonical_sha256_bytes"},"source_id":"0907.3728","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b6c591757f567a5c38c5d0fad247292fea2b1aa73b1d412c0be9466239a1833e","sha256:8ead456e36ed6c1553d206209b5cfa0584c349fe7b541042b6da7a8bfc1d3bba"],"state_sha256":"35b502a9b1ad3744b73164a979387c5f89ee8cdb9b0b84b6ac9d9e66f8d6965d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VOrYpp2GtjBLevn29/Ud3vFGT/tiZtnyVHOKvmGFjXMjr61jemB+hOVaRCUWH7rK49+BNZjJSu68XAVJSKiNAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T13:30:43.447513Z","bundle_sha256":"b911a7c7db4dfb1f5c05b446d9d15a1e2856c9c5a667a27a938cc8b206d3c130"}}