{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:5Y4NPAPASHFR2WYOZWAD6IMKZR","short_pith_number":"pith:5Y4NPAPA","canonical_record":{"source":{"id":"1605.09402","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-05-30T20:10:31Z","cross_cats_sorted":[],"title_canon_sha256":"932aca1e2a29c3e29ba40cd364025fddee064e6a83f7ab2846ffbc1d20c3e453","abstract_canon_sha256":"85d1c1c74ececad74819abc3d7c00e2d0f42d78ac2f34f534248b78fda7a7593"},"schema_version":"1.0"},"canonical_sha256":"ee38d781e091cb1d5b0ecd803f218acc6aeb82c2d33ce3285d4542a4ff8622b4","source":{"kind":"arxiv","id":"1605.09402","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1605.09402","created_at":"2026-05-18T01:01:23Z"},{"alias_kind":"arxiv_version","alias_value":"1605.09402v3","created_at":"2026-05-18T01:01:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1605.09402","created_at":"2026-05-18T01:01:23Z"},{"alias_kind":"pith_short_12","alias_value":"5Y4NPAPASHFR","created_at":"2026-05-18T12:30:01Z"},{"alias_kind":"pith_short_16","alias_value":"5Y4NPAPASHFR2WYO","created_at":"2026-05-18T12:30:01Z"},{"alias_kind":"pith_short_8","alias_value":"5Y4NPAPA","created_at":"2026-05-18T12:30:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:5Y4NPAPASHFR2WYOZWAD6IMKZR","target":"record","payload":{"canonical_record":{"source":{"id":"1605.09402","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-05-30T20:10:31Z","cross_cats_sorted":[],"title_canon_sha256":"932aca1e2a29c3e29ba40cd364025fddee064e6a83f7ab2846ffbc1d20c3e453","abstract_canon_sha256":"85d1c1c74ececad74819abc3d7c00e2d0f42d78ac2f34f534248b78fda7a7593"},"schema_version":"1.0"},"canonical_sha256":"ee38d781e091cb1d5b0ecd803f218acc6aeb82c2d33ce3285d4542a4ff8622b4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:01:23.729673Z","signature_b64":"mnDMfdv/yYw7r2iepFtAjlh1/B9Vi2kTK2bVq4j1vq8fDo8964jg6xzLoyy0lji0ZihZkOUHrpFa6snUi91eBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ee38d781e091cb1d5b0ecd803f218acc6aeb82c2d33ce3285d4542a4ff8622b4","last_reissued_at":"2026-05-18T01:01:23.729157Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:01:23.729157Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1605.09402","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:01:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vVy62cfPtNV02fvlvxSyvR/o2C3D92MM7cTV8xyZ/2TpsYFgBxo0PKke1j/nizHg4gfkcQvNVAPUFQCcwIT0CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T15:02:00.937074Z"},"content_sha256":"733aa0aebcb469fec1d32046ce5bf9b11a790d7e9a353101555e0fa1bdab1de8","schema_version":"1.0","event_id":"sha256:733aa0aebcb469fec1d32046ce5bf9b11a790d7e9a353101555e0fa1bdab1de8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:5Y4NPAPASHFR2WYOZWAD6IMKZR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Toward gas exhaustion in the W51 high-mass protoclusters","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Adam Ginsburg, Allison Youngblood, Cara D. Battersby, Ciriaco Goddi, Hauyu Baobab Liu, James E. Dale, Jeremy Darling, J. M. Diederik Kruijssen, John Bally, Ravi Sankrit, Roberto Galv\\'an-Madrid, Rowan Smith, W. M. Goss","submitted_at":"2016-05-30T20:10:31Z","abstract_excerpt":"We present new JVLA observations of the high-mass cluster-forming region W51A from 2 to 16 GHz with resolution ${\\theta}_{fwhm} \\approx$ 0.3 - 0.5\". The data reveal a wealth of observational results: (1) Currently-forming, very massive (proto-O) stars are traced by o-H2CO $2_{1,1}-2_{1,2}$ emission, suggesting that this line can be used efficiently as a massive protostar tracer. (2) There is a spatially distributed population of $\\sim$mJy continuum sources, including hypercompact H ii regions and candidate colliding wind binaries, in and around the W51 proto-clusters. (3) There are two clearly"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1605.09402","kind":"arxiv","version":3},"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":"2026-05-18T01:01:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DOBhoKIDr4j7/7iTmhT3HGdZ9aAQ5cYbcdUNui7oHPlVm+L0wg4tIaKV18QZR85GNFEEHJL8PVam+rI/Q5zhBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T15:02:00.937667Z"},"content_sha256":"e7cba979ab3232810aaa9c8d79848a42703e984a7f0c73637d9890a3d5eb3955","schema_version":"1.0","event_id":"sha256:e7cba979ab3232810aaa9c8d79848a42703e984a7f0c73637d9890a3d5eb3955"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5Y4NPAPASHFR2WYOZWAD6IMKZR/bundle.json","state_url":"https://pith.science/pith/5Y4NPAPASHFR2WYOZWAD6IMKZR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5Y4NPAPASHFR2WYOZWAD6IMKZR/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":"2026-06-04T15:02:00Z","links":{"resolver":"https://pith.science/pith/5Y4NPAPASHFR2WYOZWAD6IMKZR","bundle":"https://pith.science/pith/5Y4NPAPASHFR2WYOZWAD6IMKZR/bundle.json","state":"https://pith.science/pith/5Y4NPAPASHFR2WYOZWAD6IMKZR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5Y4NPAPASHFR2WYOZWAD6IMKZR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:5Y4NPAPASHFR2WYOZWAD6IMKZR","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":"85d1c1c74ececad74819abc3d7c00e2d0f42d78ac2f34f534248b78fda7a7593","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-05-30T20:10:31Z","title_canon_sha256":"932aca1e2a29c3e29ba40cd364025fddee064e6a83f7ab2846ffbc1d20c3e453"},"schema_version":"1.0","source":{"id":"1605.09402","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1605.09402","created_at":"2026-05-18T01:01:23Z"},{"alias_kind":"arxiv_version","alias_value":"1605.09402v3","created_at":"2026-05-18T01:01:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1605.09402","created_at":"2026-05-18T01:01:23Z"},{"alias_kind":"pith_short_12","alias_value":"5Y4NPAPASHFR","created_at":"2026-05-18T12:30:01Z"},{"alias_kind":"pith_short_16","alias_value":"5Y4NPAPASHFR2WYO","created_at":"2026-05-18T12:30:01Z"},{"alias_kind":"pith_short_8","alias_value":"5Y4NPAPA","created_at":"2026-05-18T12:30:01Z"}],"graph_snapshots":[{"event_id":"sha256:e7cba979ab3232810aaa9c8d79848a42703e984a7f0c73637d9890a3d5eb3955","target":"graph","created_at":"2026-05-18T01:01:23Z","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 present new JVLA observations of the high-mass cluster-forming region W51A from 2 to 16 GHz with resolution ${\\theta}_{fwhm} \\approx$ 0.3 - 0.5\". The data reveal a wealth of observational results: (1) Currently-forming, very massive (proto-O) stars are traced by o-H2CO $2_{1,1}-2_{1,2}$ emission, suggesting that this line can be used efficiently as a massive protostar tracer. (2) There is a spatially distributed population of $\\sim$mJy continuum sources, including hypercompact H ii regions and candidate colliding wind binaries, in and around the W51 proto-clusters. (3) There are two clearly","authors_text":"Adam Ginsburg, Allison Youngblood, Cara D. Battersby, Ciriaco Goddi, Hauyu Baobab Liu, James E. Dale, Jeremy Darling, J. M. Diederik Kruijssen, John Bally, Ravi Sankrit, Roberto Galv\\'an-Madrid, Rowan Smith, W. M. Goss","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-05-30T20:10:31Z","title":"Toward gas exhaustion in the W51 high-mass protoclusters"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1605.09402","kind":"arxiv","version":3},"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":"sha256:733aa0aebcb469fec1d32046ce5bf9b11a790d7e9a353101555e0fa1bdab1de8","target":"record","created_at":"2026-05-18T01:01:23Z","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":"85d1c1c74ececad74819abc3d7c00e2d0f42d78ac2f34f534248b78fda7a7593","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-05-30T20:10:31Z","title_canon_sha256":"932aca1e2a29c3e29ba40cd364025fddee064e6a83f7ab2846ffbc1d20c3e453"},"schema_version":"1.0","source":{"id":"1605.09402","kind":"arxiv","version":3}},"canonical_sha256":"ee38d781e091cb1d5b0ecd803f218acc6aeb82c2d33ce3285d4542a4ff8622b4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ee38d781e091cb1d5b0ecd803f218acc6aeb82c2d33ce3285d4542a4ff8622b4","first_computed_at":"2026-05-18T01:01:23.729157Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:01:23.729157Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"mnDMfdv/yYw7r2iepFtAjlh1/B9Vi2kTK2bVq4j1vq8fDo8964jg6xzLoyy0lji0ZihZkOUHrpFa6snUi91eBg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:01:23.729673Z","signed_message":"canonical_sha256_bytes"},"source_id":"1605.09402","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:733aa0aebcb469fec1d32046ce5bf9b11a790d7e9a353101555e0fa1bdab1de8","sha256:e7cba979ab3232810aaa9c8d79848a42703e984a7f0c73637d9890a3d5eb3955"],"state_sha256":"c7c348634e766b744344e7b3d9fedf55929e416c94f161435991b23de9197910"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"n521A26DbpudFrYGyscjVzRV1UFZkDVWHDwq811uyHavy9coIznnEn32rkjOaB4n3nFsz1ZtvczGIfHW0pUGAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T15:02:00.940144Z","bundle_sha256":"f7073bc70be807e02b047695d15f8abd74ed20c078114a3d853c72852d1c2f0f"}}