{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:C2CNBPAI4SGEG75WBXALVRB3NM","short_pith_number":"pith:C2CNBPAI","canonical_record":{"source":{"id":"1506.02654","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-06-08T20:00:21Z","cross_cats_sorted":[],"title_canon_sha256":"98c7e65400ae3727e3d4395918c594b27c44240aba2d5be1add1a5edc0adaf37","abstract_canon_sha256":"132c23e6c1762dd9cefba4c33bdd3b5912add61940ea339b44e7659357177243"},"schema_version":"1.0"},"canonical_sha256":"1684d0bc08e48c437fb60dc0bac43b6b150dd7482705702c966e7b1e5d264eec","source":{"kind":"arxiv","id":"1506.02654","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1506.02654","created_at":"2026-05-18T01:36:52Z"},{"alias_kind":"arxiv_version","alias_value":"1506.02654v2","created_at":"2026-05-18T01:36:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1506.02654","created_at":"2026-05-18T01:36:52Z"},{"alias_kind":"pith_short_12","alias_value":"C2CNBPAI4SGE","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_16","alias_value":"C2CNBPAI4SGEG75W","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_8","alias_value":"C2CNBPAI","created_at":"2026-05-18T12:29:14Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:C2CNBPAI4SGEG75WBXALVRB3NM","target":"record","payload":{"canonical_record":{"source":{"id":"1506.02654","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-06-08T20:00:21Z","cross_cats_sorted":[],"title_canon_sha256":"98c7e65400ae3727e3d4395918c594b27c44240aba2d5be1add1a5edc0adaf37","abstract_canon_sha256":"132c23e6c1762dd9cefba4c33bdd3b5912add61940ea339b44e7659357177243"},"schema_version":"1.0"},"canonical_sha256":"1684d0bc08e48c437fb60dc0bac43b6b150dd7482705702c966e7b1e5d264eec","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:36:52.966645Z","signature_b64":"k+j2Hb4we/X3yH/LMDwCTQ/suchKXgIVdbMk53YyuBMIEMpYGfWRIUoiTIaAmFQxkAXerpnJCQBxZVb62CX0Aw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1684d0bc08e48c437fb60dc0bac43b6b150dd7482705702c966e7b1e5d264eec","last_reissued_at":"2026-05-18T01:36:52.966105Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:36:52.966105Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1506.02654","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:36:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"d8mqLpgQ5XB8O4ue2TWnaSMKpMJ9Rk9VYkvbyDGYiLWYPeODUtFWmCwev6L+ooBHrRcErKGASiSYzS6vY/L4Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T16:15:36.292747Z"},"content_sha256":"83e949782cf6564a3907e7a8d51a733dfb45d3f7841ee58da5ed8327c0170821","schema_version":"1.0","event_id":"sha256:83e949782cf6564a3907e7a8d51a733dfb45d3f7841ee58da5ed8327c0170821"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:C2CNBPAI4SGEG75WBXALVRB3NM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The initial mass functions of M31 and M32 through far red stellar absorption features","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Niranjan Thatte, Roger L. Davies, Ryan C. W. Houghton, Simon Zieleniewski","submitted_at":"2015-06-08T20:00:21Z","abstract_excerpt":"Using the Oxford Short Wavelength Integral Field specTrograph (SWIFT), we investigate radial variations of several initial mass function (IMF) dependent absorption features in M31 and M32. We obtain high signal-to-noise spectra at six pointings along the major axis of M31 out to ~ 700\" (2.7 kpc) and a single pointing of the central 10 pc for M32. In M31 the sodium NaI {\\lambda}8190 index shows a flat equivalent width profile at ~ 0.4 {\\AA} through the majority of the bulge, with a strong gradient up to 0.8 {\\AA} in the central 10\" (38 pc); the Wing-Ford FeH {\\lambda}9916 index is measured to b"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1506.02654","kind":"arxiv","version":2},"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":"2026-05-18T01:36:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"V4AwaY5DpROvFgTunriZTJrW0tZSHntTmWZOsboG9vCDqionDTp7oBtcaJb+ihSx76DO865InVEFGXDW8GgmDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T16:15:36.293104Z"},"content_sha256":"8058a797683f91cc57a78bbd3157d6b950a5c1709716dd1cf08ba598fc26ed0e","schema_version":"1.0","event_id":"sha256:8058a797683f91cc57a78bbd3157d6b950a5c1709716dd1cf08ba598fc26ed0e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/C2CNBPAI4SGEG75WBXALVRB3NM/bundle.json","state_url":"https://pith.science/pith/C2CNBPAI4SGEG75WBXALVRB3NM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/C2CNBPAI4SGEG75WBXALVRB3NM/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":"2026-05-19T16:15:36Z","links":{"resolver":"https://pith.science/pith/C2CNBPAI4SGEG75WBXALVRB3NM","bundle":"https://pith.science/pith/C2CNBPAI4SGEG75WBXALVRB3NM/bundle.json","state":"https://pith.science/pith/C2CNBPAI4SGEG75WBXALVRB3NM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/C2CNBPAI4SGEG75WBXALVRB3NM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:C2CNBPAI4SGEG75WBXALVRB3NM","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":"132c23e6c1762dd9cefba4c33bdd3b5912add61940ea339b44e7659357177243","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-06-08T20:00:21Z","title_canon_sha256":"98c7e65400ae3727e3d4395918c594b27c44240aba2d5be1add1a5edc0adaf37"},"schema_version":"1.0","source":{"id":"1506.02654","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1506.02654","created_at":"2026-05-18T01:36:52Z"},{"alias_kind":"arxiv_version","alias_value":"1506.02654v2","created_at":"2026-05-18T01:36:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1506.02654","created_at":"2026-05-18T01:36:52Z"},{"alias_kind":"pith_short_12","alias_value":"C2CNBPAI4SGE","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_16","alias_value":"C2CNBPAI4SGEG75W","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_8","alias_value":"C2CNBPAI","created_at":"2026-05-18T12:29:14Z"}],"graph_snapshots":[{"event_id":"sha256:8058a797683f91cc57a78bbd3157d6b950a5c1709716dd1cf08ba598fc26ed0e","target":"graph","created_at":"2026-05-18T01:36:52Z","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":"Using the Oxford Short Wavelength Integral Field specTrograph (SWIFT), we investigate radial variations of several initial mass function (IMF) dependent absorption features in M31 and M32. We obtain high signal-to-noise spectra at six pointings along the major axis of M31 out to ~ 700\" (2.7 kpc) and a single pointing of the central 10 pc for M32. In M31 the sodium NaI {\\lambda}8190 index shows a flat equivalent width profile at ~ 0.4 {\\AA} through the majority of the bulge, with a strong gradient up to 0.8 {\\AA} in the central 10\" (38 pc); the Wing-Ford FeH {\\lambda}9916 index is measured to b","authors_text":"Niranjan Thatte, Roger L. Davies, Ryan C. W. Houghton, Simon Zieleniewski","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-06-08T20:00:21Z","title":"The initial mass functions of M31 and M32 through far red stellar absorption features"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1506.02654","kind":"arxiv","version":2},"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":"sha256:83e949782cf6564a3907e7a8d51a733dfb45d3f7841ee58da5ed8327c0170821","target":"record","created_at":"2026-05-18T01:36:52Z","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":"132c23e6c1762dd9cefba4c33bdd3b5912add61940ea339b44e7659357177243","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-06-08T20:00:21Z","title_canon_sha256":"98c7e65400ae3727e3d4395918c594b27c44240aba2d5be1add1a5edc0adaf37"},"schema_version":"1.0","source":{"id":"1506.02654","kind":"arxiv","version":2}},"canonical_sha256":"1684d0bc08e48c437fb60dc0bac43b6b150dd7482705702c966e7b1e5d264eec","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1684d0bc08e48c437fb60dc0bac43b6b150dd7482705702c966e7b1e5d264eec","first_computed_at":"2026-05-18T01:36:52.966105Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:36:52.966105Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"k+j2Hb4we/X3yH/LMDwCTQ/suchKXgIVdbMk53YyuBMIEMpYGfWRIUoiTIaAmFQxkAXerpnJCQBxZVb62CX0Aw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:36:52.966645Z","signed_message":"canonical_sha256_bytes"},"source_id":"1506.02654","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:83e949782cf6564a3907e7a8d51a733dfb45d3f7841ee58da5ed8327c0170821","sha256:8058a797683f91cc57a78bbd3157d6b950a5c1709716dd1cf08ba598fc26ed0e"],"state_sha256":"7cd7b63edac7f606e927954301a94fd4d443b00baf746c53508cc2e796eab862"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BEUHAzIeiFhIcxX09x7mvE9R/OoVHh+zUOrKJ2eCR2Wo8GXbyMcGX7Fb9jeLOe/lvVCLC5wd/M99qKbiNdfVDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-19T16:15:36.296155Z","bundle_sha256":"f54ea3b998ed3cda7117698976aa09168b07956c298993b32f12c48a223d4a65"}}