{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:HR6XEUKO74AHLI6KCWXPATEJ3N","short_pith_number":"pith:HR6XEUKO","canonical_record":{"source":{"id":"1606.05349","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-06-16T20:00:03Z","cross_cats_sorted":[],"title_canon_sha256":"5f649fe55c0599bd1116982ff8e74f67efb65d446027f9bd8a4019a9cb69ff6d","abstract_canon_sha256":"7771d05346cf4d9f39059cc8f923cb731b10fe301b92ae35b8038479fdb54e26"},"schema_version":"1.0"},"canonical_sha256":"3c7d72514eff0075a3ca15aef04c89db439d24686a84f3698a3fb9baaf97fd45","source":{"kind":"arxiv","id":"1606.05349","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1606.05349","created_at":"2026-05-18T01:08:38Z"},{"alias_kind":"arxiv_version","alias_value":"1606.05349v1","created_at":"2026-05-18T01:08:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1606.05349","created_at":"2026-05-18T01:08:38Z"},{"alias_kind":"pith_short_12","alias_value":"HR6XEUKO74AH","created_at":"2026-05-18T12:30:19Z"},{"alias_kind":"pith_short_16","alias_value":"HR6XEUKO74AHLI6K","created_at":"2026-05-18T12:30:19Z"},{"alias_kind":"pith_short_8","alias_value":"HR6XEUKO","created_at":"2026-05-18T12:30:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:HR6XEUKO74AHLI6KCWXPATEJ3N","target":"record","payload":{"canonical_record":{"source":{"id":"1606.05349","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-06-16T20:00:03Z","cross_cats_sorted":[],"title_canon_sha256":"5f649fe55c0599bd1116982ff8e74f67efb65d446027f9bd8a4019a9cb69ff6d","abstract_canon_sha256":"7771d05346cf4d9f39059cc8f923cb731b10fe301b92ae35b8038479fdb54e26"},"schema_version":"1.0"},"canonical_sha256":"3c7d72514eff0075a3ca15aef04c89db439d24686a84f3698a3fb9baaf97fd45","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:08:38.703155Z","signature_b64":"wMaUss117Ya5xQ4dlZFa2E2+Z/aORvvzKac+iCo9P1sSLAlt6BPNK2l+dwdsshRYAUM0DjRkujM7WGRH1G3mAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3c7d72514eff0075a3ca15aef04c89db439d24686a84f3698a3fb9baaf97fd45","last_reissued_at":"2026-05-18T01:08:38.702505Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:08:38.702505Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1606.05349","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":"2026-05-18T01:08:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"++Eo/moojNBV8CcKTCGdgKnjo56zZ7nxcC/MiTiEBAnUCWPj5T09TaYFVuTln2VN9N2x9bAaQYPbmLoWP2dwDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T16:40:57.754922Z"},"content_sha256":"5d3c5c22293ac0452d3ad727905d770a052f184decf780724ae463437b39dcf5","schema_version":"1.0","event_id":"sha256:5d3c5c22293ac0452d3ad727905d770a052f184decf780724ae463437b39dcf5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:HR6XEUKO74AHLI6KCWXPATEJ3N","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Panchromatic Hubble Andromeda Treasury XVI. Star Cluster Formation Efficiency and the Clustered Fraction of Young Stars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Alexia R. Lewis, Andrew E. Dolphin, Anil C. Seth, Benjamin F. Williams, Daniel R. Weisz, Eric F. Bell, Evan D. Skillman, Julianne J. Dalcanton, Karin Sandstrom, L. Clifton Johnson, Lori C. Beerman, Morgan Fouesneau, S{\\o}ren S. Larsen","submitted_at":"2016-06-16T20:00:03Z","abstract_excerpt":"We use the Panchromatic Hubble Andromeda Treasury (PHAT) survey dataset to perform spatially resolved measurements of star cluster formation efficiency ($\\Gamma$), the fraction of stellar mass formed in long-lived star clusters. We use robust star formation history and cluster parameter constraints, obtained through color-magnitude diagram analysis of resolved stellar populations, to study Andromeda's cluster and field populations over the last $\\sim$300 Myr. We measure $\\Gamma$ of 4-8% for young, 10-100 Myr old populations in M31. We find that cluster formation efficiency varies systematicall"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1606.05349","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":"2026-05-18T01:08:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kvb35AJ1Htsgk7QbkBLz87YSS268hGhvM8TKFCXHe+cY5MG8LGUARaQFSnQ1+rw6EIkyIkTuvqe4X8zyavTJBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T16:40:57.755538Z"},"content_sha256":"f99ca90e55d4296c65962482dc4a28bc6975083e8406f4aab26245480edefe67","schema_version":"1.0","event_id":"sha256:f99ca90e55d4296c65962482dc4a28bc6975083e8406f4aab26245480edefe67"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HR6XEUKO74AHLI6KCWXPATEJ3N/bundle.json","state_url":"https://pith.science/pith/HR6XEUKO74AHLI6KCWXPATEJ3N/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HR6XEUKO74AHLI6KCWXPATEJ3N/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":"2026-06-03T16:40:57Z","links":{"resolver":"https://pith.science/pith/HR6XEUKO74AHLI6KCWXPATEJ3N","bundle":"https://pith.science/pith/HR6XEUKO74AHLI6KCWXPATEJ3N/bundle.json","state":"https://pith.science/pith/HR6XEUKO74AHLI6KCWXPATEJ3N/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HR6XEUKO74AHLI6KCWXPATEJ3N/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:HR6XEUKO74AHLI6KCWXPATEJ3N","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":"7771d05346cf4d9f39059cc8f923cb731b10fe301b92ae35b8038479fdb54e26","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-06-16T20:00:03Z","title_canon_sha256":"5f649fe55c0599bd1116982ff8e74f67efb65d446027f9bd8a4019a9cb69ff6d"},"schema_version":"1.0","source":{"id":"1606.05349","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1606.05349","created_at":"2026-05-18T01:08:38Z"},{"alias_kind":"arxiv_version","alias_value":"1606.05349v1","created_at":"2026-05-18T01:08:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1606.05349","created_at":"2026-05-18T01:08:38Z"},{"alias_kind":"pith_short_12","alias_value":"HR6XEUKO74AH","created_at":"2026-05-18T12:30:19Z"},{"alias_kind":"pith_short_16","alias_value":"HR6XEUKO74AHLI6K","created_at":"2026-05-18T12:30:19Z"},{"alias_kind":"pith_short_8","alias_value":"HR6XEUKO","created_at":"2026-05-18T12:30:19Z"}],"graph_snapshots":[{"event_id":"sha256:f99ca90e55d4296c65962482dc4a28bc6975083e8406f4aab26245480edefe67","target":"graph","created_at":"2026-05-18T01:08:38Z","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 the Panchromatic Hubble Andromeda Treasury (PHAT) survey dataset to perform spatially resolved measurements of star cluster formation efficiency ($\\Gamma$), the fraction of stellar mass formed in long-lived star clusters. We use robust star formation history and cluster parameter constraints, obtained through color-magnitude diagram analysis of resolved stellar populations, to study Andromeda's cluster and field populations over the last $\\sim$300 Myr. We measure $\\Gamma$ of 4-8% for young, 10-100 Myr old populations in M31. We find that cluster formation efficiency varies systematicall","authors_text":"Alexia R. Lewis, Andrew E. Dolphin, Anil C. Seth, Benjamin F. Williams, Daniel R. Weisz, Eric F. Bell, Evan D. Skillman, Julianne J. Dalcanton, Karin Sandstrom, L. Clifton Johnson, Lori C. Beerman, Morgan Fouesneau, S{\\o}ren S. Larsen","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-06-16T20:00:03Z","title":"Panchromatic Hubble Andromeda Treasury XVI. Star Cluster Formation Efficiency and the Clustered Fraction of Young Stars"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1606.05349","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":"sha256:5d3c5c22293ac0452d3ad727905d770a052f184decf780724ae463437b39dcf5","target":"record","created_at":"2026-05-18T01:08:38Z","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":"7771d05346cf4d9f39059cc8f923cb731b10fe301b92ae35b8038479fdb54e26","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-06-16T20:00:03Z","title_canon_sha256":"5f649fe55c0599bd1116982ff8e74f67efb65d446027f9bd8a4019a9cb69ff6d"},"schema_version":"1.0","source":{"id":"1606.05349","kind":"arxiv","version":1}},"canonical_sha256":"3c7d72514eff0075a3ca15aef04c89db439d24686a84f3698a3fb9baaf97fd45","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3c7d72514eff0075a3ca15aef04c89db439d24686a84f3698a3fb9baaf97fd45","first_computed_at":"2026-05-18T01:08:38.702505Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:08:38.702505Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"wMaUss117Ya5xQ4dlZFa2E2+Z/aORvvzKac+iCo9P1sSLAlt6BPNK2l+dwdsshRYAUM0DjRkujM7WGRH1G3mAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:08:38.703155Z","signed_message":"canonical_sha256_bytes"},"source_id":"1606.05349","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5d3c5c22293ac0452d3ad727905d770a052f184decf780724ae463437b39dcf5","sha256:f99ca90e55d4296c65962482dc4a28bc6975083e8406f4aab26245480edefe67"],"state_sha256":"c7face168f1a48367a67087e987964d1b97893fc826fab256c6eb3f440f1901b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dj4ChHJsZNXwXNeqYL+fCM+zLGVuluUHMXHpsZKYEF/9/fNCAnetPJ3/ObV7TmRSXFuRf1I4vG5tW7tn9CtEAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T16:40:57.758892Z","bundle_sha256":"15f2491747795793ce946b62abaf7cd03225265e4ed9e6756eb387a4512af89d"}}