{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:2RAMFGPMGWHRF4DSNACCD4CHSV","short_pith_number":"pith:2RAMFGPM","canonical_record":{"source":{"id":"1504.07239","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-04-27T20:00:37Z","cross_cats_sorted":[],"title_canon_sha256":"f8676dad3f867a6ecc1126997b103255f862647a3fce3a5b3378067b8cca67c7","abstract_canon_sha256":"6a3abb04c74fe2c0e2aca2b657e706aebb669dd06bd570317c7d8e8f6b29109d"},"schema_version":"1.0"},"canonical_sha256":"d440c299ec358f12f072680421f0479562c7872b75a540d9f74ba7aadf0afa1b","source":{"kind":"arxiv","id":"1504.07239","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1504.07239","created_at":"2026-05-18T01:35:48Z"},{"alias_kind":"arxiv_version","alias_value":"1504.07239v1","created_at":"2026-05-18T01:35:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1504.07239","created_at":"2026-05-18T01:35:48Z"},{"alias_kind":"pith_short_12","alias_value":"2RAMFGPMGWHR","created_at":"2026-05-18T12:29:02Z"},{"alias_kind":"pith_short_16","alias_value":"2RAMFGPMGWHRF4DS","created_at":"2026-05-18T12:29:02Z"},{"alias_kind":"pith_short_8","alias_value":"2RAMFGPM","created_at":"2026-05-18T12:29:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:2RAMFGPMGWHRF4DSNACCD4CHSV","target":"record","payload":{"canonical_record":{"source":{"id":"1504.07239","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-04-27T20:00:37Z","cross_cats_sorted":[],"title_canon_sha256":"f8676dad3f867a6ecc1126997b103255f862647a3fce3a5b3378067b8cca67c7","abstract_canon_sha256":"6a3abb04c74fe2c0e2aca2b657e706aebb669dd06bd570317c7d8e8f6b29109d"},"schema_version":"1.0"},"canonical_sha256":"d440c299ec358f12f072680421f0479562c7872b75a540d9f74ba7aadf0afa1b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:35:48.292081Z","signature_b64":"4/26m8AQzNeARDSusDxR88QSTuVJ1E7kD0VRFtUPmwSwFGdRLPzP5a+wbg0MoXb11JOthUQTcQwpe5z23VpCDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d440c299ec358f12f072680421f0479562c7872b75a540d9f74ba7aadf0afa1b","last_reissued_at":"2026-05-18T01:35:48.291347Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:35:48.291347Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1504.07239","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":"2026-05-18T01:35:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FPnnh+JUPtzbK4QaMshXsUWHFJOJtTY26AkNpJFLtc+GnH11gaIOualzswJeaEs3b61YFSLrkAcC+0/c9Hd3Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T13:27:28.630867Z"},"content_sha256":"c92656c8a9b65f4bbeca73cf52b7731038b4cf9f4f6174a17782d4d64cf4a787","schema_version":"1.0","event_id":"sha256:c92656c8a9b65f4bbeca73cf52b7731038b4cf9f4f6174a17782d4d64cf4a787"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:2RAMFGPMGWHRF4DSNACCD4CHSV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Mapping the Outer Edge of the Young Stellar Cluster in the Galactic Center","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Andrea M. Ghez, Jessica R. Lu, Morten N. St{\\o}stad, Norm Murray, Sylvana Yelda, Tuan Do","submitted_at":"2015-04-27T20:00:37Z","abstract_excerpt":"We present new near-infrared spectroscopic observations of the outer edges of the young stellar cluster around the supermassive black hole at the Galactic center. The observations show a break in the surface-density profile of young stars at approximately 13 arcsec (0.52 pc). These observations spectroscopically confirm previous suggestions of a break based on photometry. Using Gemini North's Near-Infrared Integral Field Spectrometer (NIFS) we are able to detect and separate early- and late-type stars with a 75% completeness at Ks = 15.5. We sample a region with radii between 7\" to 23\" (0.28 p"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1504.07239","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":"2026-05-18T01:35:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ng2DKe6vIYKpQ2RbiZVAz5n77nG0l2192qC23gmtiKcRZbs0vOfQJLCornQys+zEkbu4bw4LZyMO8kUFLmCVAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T13:27:28.631216Z"},"content_sha256":"4aec3afa5b4e7f08bb9c650b8c7bc2f3a4358d44607fb1ca81bf307ca1bf7685","schema_version":"1.0","event_id":"sha256:4aec3afa5b4e7f08bb9c650b8c7bc2f3a4358d44607fb1ca81bf307ca1bf7685"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2RAMFGPMGWHRF4DSNACCD4CHSV/bundle.json","state_url":"https://pith.science/pith/2RAMFGPMGWHRF4DSNACCD4CHSV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2RAMFGPMGWHRF4DSNACCD4CHSV/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":"2026-05-28T13:27:28Z","links":{"resolver":"https://pith.science/pith/2RAMFGPMGWHRF4DSNACCD4CHSV","bundle":"https://pith.science/pith/2RAMFGPMGWHRF4DSNACCD4CHSV/bundle.json","state":"https://pith.science/pith/2RAMFGPMGWHRF4DSNACCD4CHSV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2RAMFGPMGWHRF4DSNACCD4CHSV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:2RAMFGPMGWHRF4DSNACCD4CHSV","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":"6a3abb04c74fe2c0e2aca2b657e706aebb669dd06bd570317c7d8e8f6b29109d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-04-27T20:00:37Z","title_canon_sha256":"f8676dad3f867a6ecc1126997b103255f862647a3fce3a5b3378067b8cca67c7"},"schema_version":"1.0","source":{"id":"1504.07239","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1504.07239","created_at":"2026-05-18T01:35:48Z"},{"alias_kind":"arxiv_version","alias_value":"1504.07239v1","created_at":"2026-05-18T01:35:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1504.07239","created_at":"2026-05-18T01:35:48Z"},{"alias_kind":"pith_short_12","alias_value":"2RAMFGPMGWHR","created_at":"2026-05-18T12:29:02Z"},{"alias_kind":"pith_short_16","alias_value":"2RAMFGPMGWHRF4DS","created_at":"2026-05-18T12:29:02Z"},{"alias_kind":"pith_short_8","alias_value":"2RAMFGPM","created_at":"2026-05-18T12:29:02Z"}],"graph_snapshots":[{"event_id":"sha256:4aec3afa5b4e7f08bb9c650b8c7bc2f3a4358d44607fb1ca81bf307ca1bf7685","target":"graph","created_at":"2026-05-18T01:35:48Z","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 near-infrared spectroscopic observations of the outer edges of the young stellar cluster around the supermassive black hole at the Galactic center. The observations show a break in the surface-density profile of young stars at approximately 13 arcsec (0.52 pc). These observations spectroscopically confirm previous suggestions of a break based on photometry. Using Gemini North's Near-Infrared Integral Field Spectrometer (NIFS) we are able to detect and separate early- and late-type stars with a 75% completeness at Ks = 15.5. We sample a region with radii between 7\" to 23\" (0.28 p","authors_text":"Andrea M. Ghez, Jessica R. Lu, Morten N. St{\\o}stad, Norm Murray, Sylvana Yelda, Tuan Do","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-04-27T20:00:37Z","title":"Mapping the Outer Edge of the Young Stellar Cluster in the Galactic Center"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1504.07239","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:c92656c8a9b65f4bbeca73cf52b7731038b4cf9f4f6174a17782d4d64cf4a787","target":"record","created_at":"2026-05-18T01:35:48Z","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":"6a3abb04c74fe2c0e2aca2b657e706aebb669dd06bd570317c7d8e8f6b29109d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-04-27T20:00:37Z","title_canon_sha256":"f8676dad3f867a6ecc1126997b103255f862647a3fce3a5b3378067b8cca67c7"},"schema_version":"1.0","source":{"id":"1504.07239","kind":"arxiv","version":1}},"canonical_sha256":"d440c299ec358f12f072680421f0479562c7872b75a540d9f74ba7aadf0afa1b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d440c299ec358f12f072680421f0479562c7872b75a540d9f74ba7aadf0afa1b","first_computed_at":"2026-05-18T01:35:48.291347Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:35:48.291347Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"4/26m8AQzNeARDSusDxR88QSTuVJ1E7kD0VRFtUPmwSwFGdRLPzP5a+wbg0MoXb11JOthUQTcQwpe5z23VpCDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:35:48.292081Z","signed_message":"canonical_sha256_bytes"},"source_id":"1504.07239","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c92656c8a9b65f4bbeca73cf52b7731038b4cf9f4f6174a17782d4d64cf4a787","sha256:4aec3afa5b4e7f08bb9c650b8c7bc2f3a4358d44607fb1ca81bf307ca1bf7685"],"state_sha256":"03a5f624ae3f78fe075659097dd910ad77dc77320fb4fc708febdb21b7131c0c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EgDiSX5ej3cao2oK/9RNSAHxKF+uVGpbew2iKaj3fnUwSyw++Lx4P4Q3Z3BrPRMjJp2pxlxPAgiozVqExIP9Aw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T13:27:28.633191Z","bundle_sha256":"813f8bddeab69ee7aa5275a9f46510e7362f39fee3ede3b84b648ba7803e59c4"}}