{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:5R6GPQE4ZTGWUN74V2X6ZE3RKF","short_pith_number":"pith:5R6GPQE4","canonical_record":{"source":{"id":"1805.12039","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-05-30T15:39:25Z","cross_cats_sorted":[],"title_canon_sha256":"b11b0f33e21724f1b4532b3256fee48804a7e9ad1e3a142383793f82e14054c1","abstract_canon_sha256":"45b49c0fcccf8da00ff0cbe3e89e9866eb2417291c2d7c75864fddb866284cce"},"schema_version":"1.0"},"canonical_sha256":"ec7c67c09ccccd6a37fcaeafec9371516035dca51a7424ba2a009cd8553c2d6d","source":{"kind":"arxiv","id":"1805.12039","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.12039","created_at":"2026-05-18T00:08:41Z"},{"alias_kind":"arxiv_version","alias_value":"1805.12039v1","created_at":"2026-05-18T00:08:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.12039","created_at":"2026-05-18T00:08:41Z"},{"alias_kind":"pith_short_12","alias_value":"5R6GPQE4ZTGW","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_16","alias_value":"5R6GPQE4ZTGWUN74","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_8","alias_value":"5R6GPQE4","created_at":"2026-05-18T12:32:08Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:5R6GPQE4ZTGWUN74V2X6ZE3RKF","target":"record","payload":{"canonical_record":{"source":{"id":"1805.12039","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-05-30T15:39:25Z","cross_cats_sorted":[],"title_canon_sha256":"b11b0f33e21724f1b4532b3256fee48804a7e9ad1e3a142383793f82e14054c1","abstract_canon_sha256":"45b49c0fcccf8da00ff0cbe3e89e9866eb2417291c2d7c75864fddb866284cce"},"schema_version":"1.0"},"canonical_sha256":"ec7c67c09ccccd6a37fcaeafec9371516035dca51a7424ba2a009cd8553c2d6d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:08:41.425678Z","signature_b64":"JEwIvsmq09Q/j7CVN6y3tfvZr2mAcyIVQ2pAe8AQyuTJZQVP2wwdeEAfj8EnDIcHqRonzy1HlP4D2txEtHv3AA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ec7c67c09ccccd6a37fcaeafec9371516035dca51a7424ba2a009cd8553c2d6d","last_reissued_at":"2026-05-18T00:08:41.424873Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:08:41.424873Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1805.12039","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":"2026-05-18T00:08:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KCmVy85h7i9+IoKBEzkvDpx6SWjsJTdOPyfg6U05VqknwrprieszRsCaINQSvErsSkYT0PHgRBx8BDsPSEWVCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T23:11:47.958392Z"},"content_sha256":"f8b1f573b4b8925a08c112dfe405455df27241e232b58d11fb20bb1a37d023e5","schema_version":"1.0","event_id":"sha256:f8b1f573b4b8925a08c112dfe405455df27241e232b58d11fb20bb1a37d023e5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:5R6GPQE4ZTGWUN74V2X6ZE3RKF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Resolved Star Formation Efficiency in the Antennae Galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Adam K. Leroy, Allison M. Matthews, Bradley C. Whitmore, Crystal L. Brogan, Kelsey E. Johnson, Remy Indebetouw","submitted_at":"2018-05-30T15:39:25Z","abstract_excerpt":"We use Atacama Large Millimeter Array CO(3-2) observations in conjunction with optical observations from the Hubble Space Telescope to determine the ratio of stellar to gas mass for regions in the Antennae Galaxies. We adopt the term \"instantaneous mass ratio\" IMR(t) = M$_{stars}$/(M$_{gas}$ +M$_{stars}$), that is equivalent to the star formation efficiency for an idealized system at t = 0. We use two complementary approaches to determining the IMR(t) based on 1) the enclosed stellar and molecular mass within circular apertures centered on optically-identified clusters, and 2) a tessellation a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.12039","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":"2026-05-18T00:08:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"23lUJzr+5LkR74PB9W1FnbzXnyFrZRqyWld3g1Smene/0ZzRUGQiOHu15hSwsrMFVmeYUd8uSdNA9jfeq8//Bw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T23:11:47.958998Z"},"content_sha256":"2e7717078518b7a2a256fbdd7da72efeab824637fe08f83c1831b604b06f16b2","schema_version":"1.0","event_id":"sha256:2e7717078518b7a2a256fbdd7da72efeab824637fe08f83c1831b604b06f16b2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5R6GPQE4ZTGWUN74V2X6ZE3RKF/bundle.json","state_url":"https://pith.science/pith/5R6GPQE4ZTGWUN74V2X6ZE3RKF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5R6GPQE4ZTGWUN74V2X6ZE3RKF/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":"2026-06-07T23:11:47Z","links":{"resolver":"https://pith.science/pith/5R6GPQE4ZTGWUN74V2X6ZE3RKF","bundle":"https://pith.science/pith/5R6GPQE4ZTGWUN74V2X6ZE3RKF/bundle.json","state":"https://pith.science/pith/5R6GPQE4ZTGWUN74V2X6ZE3RKF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5R6GPQE4ZTGWUN74V2X6ZE3RKF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:5R6GPQE4ZTGWUN74V2X6ZE3RKF","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":"45b49c0fcccf8da00ff0cbe3e89e9866eb2417291c2d7c75864fddb866284cce","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-05-30T15:39:25Z","title_canon_sha256":"b11b0f33e21724f1b4532b3256fee48804a7e9ad1e3a142383793f82e14054c1"},"schema_version":"1.0","source":{"id":"1805.12039","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.12039","created_at":"2026-05-18T00:08:41Z"},{"alias_kind":"arxiv_version","alias_value":"1805.12039v1","created_at":"2026-05-18T00:08:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.12039","created_at":"2026-05-18T00:08:41Z"},{"alias_kind":"pith_short_12","alias_value":"5R6GPQE4ZTGW","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_16","alias_value":"5R6GPQE4ZTGWUN74","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_8","alias_value":"5R6GPQE4","created_at":"2026-05-18T12:32:08Z"}],"graph_snapshots":[{"event_id":"sha256:2e7717078518b7a2a256fbdd7da72efeab824637fe08f83c1831b604b06f16b2","target":"graph","created_at":"2026-05-18T00:08:41Z","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 use Atacama Large Millimeter Array CO(3-2) observations in conjunction with optical observations from the Hubble Space Telescope to determine the ratio of stellar to gas mass for regions in the Antennae Galaxies. We adopt the term \"instantaneous mass ratio\" IMR(t) = M$_{stars}$/(M$_{gas}$ +M$_{stars}$), that is equivalent to the star formation efficiency for an idealized system at t = 0. We use two complementary approaches to determining the IMR(t) based on 1) the enclosed stellar and molecular mass within circular apertures centered on optically-identified clusters, and 2) a tessellation a","authors_text":"Adam K. Leroy, Allison M. Matthews, Bradley C. Whitmore, Crystal L. Brogan, Kelsey E. Johnson, Remy Indebetouw","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-05-30T15:39:25Z","title":"Resolved Star Formation Efficiency in the Antennae Galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.12039","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:f8b1f573b4b8925a08c112dfe405455df27241e232b58d11fb20bb1a37d023e5","target":"record","created_at":"2026-05-18T00:08:41Z","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":"45b49c0fcccf8da00ff0cbe3e89e9866eb2417291c2d7c75864fddb866284cce","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-05-30T15:39:25Z","title_canon_sha256":"b11b0f33e21724f1b4532b3256fee48804a7e9ad1e3a142383793f82e14054c1"},"schema_version":"1.0","source":{"id":"1805.12039","kind":"arxiv","version":1}},"canonical_sha256":"ec7c67c09ccccd6a37fcaeafec9371516035dca51a7424ba2a009cd8553c2d6d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ec7c67c09ccccd6a37fcaeafec9371516035dca51a7424ba2a009cd8553c2d6d","first_computed_at":"2026-05-18T00:08:41.424873Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:08:41.424873Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"JEwIvsmq09Q/j7CVN6y3tfvZr2mAcyIVQ2pAe8AQyuTJZQVP2wwdeEAfj8EnDIcHqRonzy1HlP4D2txEtHv3AA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:08:41.425678Z","signed_message":"canonical_sha256_bytes"},"source_id":"1805.12039","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f8b1f573b4b8925a08c112dfe405455df27241e232b58d11fb20bb1a37d023e5","sha256:2e7717078518b7a2a256fbdd7da72efeab824637fe08f83c1831b604b06f16b2"],"state_sha256":"96635301b808712f62ad9c38d9a3c3c69d7d6a535943e39cad25961f2f1df893"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Kjuc8Fob05vxEzyrtqFd8WgXyWoBnLSserPownigSdqUfG4o2qTlWYP34e1OXdtmRWR3R2k+BGuMPC9Rrzz8Cw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-07T23:11:47.962516Z","bundle_sha256":"6d906bae17247a6b4e39ff2df9ebe3be7098b615868d12135abad7d1b5295f5d"}}