{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:QA7ZAQLRUJRDBPN2TQMD4GC43B","short_pith_number":"pith:QA7ZAQLR","canonical_record":{"source":{"id":"1801.06446","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-01-19T15:18:30Z","cross_cats_sorted":[],"title_canon_sha256":"aad535e4359d35a0661a1f78a452770b58905f2050ba54959e815b65b5a84e7d","abstract_canon_sha256":"74b97b76b71ab86359f9c0ba004f2ea410ee614febe3cfeae2a34b91d1fbc47a"},"schema_version":"1.0"},"canonical_sha256":"803f904171a26230bdba9c183e185cd87579798348785436669f1330be7b5586","source":{"kind":"arxiv","id":"1801.06446","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.06446","created_at":"2026-05-18T00:22:23Z"},{"alias_kind":"arxiv_version","alias_value":"1801.06446v1","created_at":"2026-05-18T00:22:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.06446","created_at":"2026-05-18T00:22:23Z"},{"alias_kind":"pith_short_12","alias_value":"QA7ZAQLRUJRD","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_16","alias_value":"QA7ZAQLRUJRDBPN2","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_8","alias_value":"QA7ZAQLR","created_at":"2026-05-18T12:32:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:QA7ZAQLRUJRDBPN2TQMD4GC43B","target":"record","payload":{"canonical_record":{"source":{"id":"1801.06446","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-01-19T15:18:30Z","cross_cats_sorted":[],"title_canon_sha256":"aad535e4359d35a0661a1f78a452770b58905f2050ba54959e815b65b5a84e7d","abstract_canon_sha256":"74b97b76b71ab86359f9c0ba004f2ea410ee614febe3cfeae2a34b91d1fbc47a"},"schema_version":"1.0"},"canonical_sha256":"803f904171a26230bdba9c183e185cd87579798348785436669f1330be7b5586","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:22:23.027897Z","signature_b64":"67VGIO5YR55pilC/nWkP+tfPXzzsYY80nrDGWYP57arsilFViWvR+d8VQ/RX/7v/k/7wEm4zofclUeKkPkiyAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"803f904171a26230bdba9c183e185cd87579798348785436669f1330be7b5586","last_reissued_at":"2026-05-18T00:22:23.027097Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:22:23.027097Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1801.06446","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":"2026-05-18T00:22:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EDn7l8GlLuN5xWirnfLnN/6bDMT6OiHwwfHSh/3/usy2WRzwmetE6FCv6jefuUM0B9/HPInimfRH29Yx1xd0Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T07:22:53.959128Z"},"content_sha256":"39eed55fa7483549deea3d979188ef3b39a89ae15914f9687fb91ec2eb95d3f2","schema_version":"1.0","event_id":"sha256:39eed55fa7483549deea3d979188ef3b39a89ae15914f9687fb91ec2eb95d3f2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:QA7ZAQLRUJRDBPN2TQMD4GC43B","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Chemical Abundances in the Leading Arm of the Magellanic Stream","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Andrew J. Fox, Bart P. Wakker, Dana I. Casetti-Dinescu, Elena D'Onghia, Felix J. Lockman, Jacqueline Antwi-Danso, J. Christopher Howk, Kathleen A. Barger, Nicolas Lehner, Paul A. Crowther, Philipp Richter","submitted_at":"2018-01-19T15:18:30Z","abstract_excerpt":"The Leading Arm (LA) of the Magellanic Stream is a vast debris field of H I clouds connecting the Milky Way and the Magellanic Clouds. It represents an example of active gas accretion onto the Galaxy. Previously only one chemical abundance measurement had been made in the LA. Here we present chemical abundance measurements using Hubble Space Telescope/Cosmic Origins Spectrograph Green Bank Telescope spectra of four sightlines passing through the LA, and three nearby sightlines that may trace outer fragments of the LA. We find low oxygen abundances, ranging from 4.0(+4.0,-2.0) percent solar to "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.06446","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":"2026-05-18T00:22:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/RqL48hSopjYjk2rmkDBmE96OeUUc6za64B3AsN0qS+nsohDPvrfv12i7SbuanNkRkcOUlr7B08RUj3MI1HgAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T07:22:53.959694Z"},"content_sha256":"a6ba7cf0934168c3c430a01df35d0735facddcefc23bd7d250f7d37df9d52aa1","schema_version":"1.0","event_id":"sha256:a6ba7cf0934168c3c430a01df35d0735facddcefc23bd7d250f7d37df9d52aa1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QA7ZAQLRUJRDBPN2TQMD4GC43B/bundle.json","state_url":"https://pith.science/pith/QA7ZAQLRUJRDBPN2TQMD4GC43B/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QA7ZAQLRUJRDBPN2TQMD4GC43B/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":"2026-05-26T07:22:53Z","links":{"resolver":"https://pith.science/pith/QA7ZAQLRUJRDBPN2TQMD4GC43B","bundle":"https://pith.science/pith/QA7ZAQLRUJRDBPN2TQMD4GC43B/bundle.json","state":"https://pith.science/pith/QA7ZAQLRUJRDBPN2TQMD4GC43B/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QA7ZAQLRUJRDBPN2TQMD4GC43B/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:QA7ZAQLRUJRDBPN2TQMD4GC43B","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":"74b97b76b71ab86359f9c0ba004f2ea410ee614febe3cfeae2a34b91d1fbc47a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-01-19T15:18:30Z","title_canon_sha256":"aad535e4359d35a0661a1f78a452770b58905f2050ba54959e815b65b5a84e7d"},"schema_version":"1.0","source":{"id":"1801.06446","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.06446","created_at":"2026-05-18T00:22:23Z"},{"alias_kind":"arxiv_version","alias_value":"1801.06446v1","created_at":"2026-05-18T00:22:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.06446","created_at":"2026-05-18T00:22:23Z"},{"alias_kind":"pith_short_12","alias_value":"QA7ZAQLRUJRD","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_16","alias_value":"QA7ZAQLRUJRDBPN2","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_8","alias_value":"QA7ZAQLR","created_at":"2026-05-18T12:32:46Z"}],"graph_snapshots":[{"event_id":"sha256:a6ba7cf0934168c3c430a01df35d0735facddcefc23bd7d250f7d37df9d52aa1","target":"graph","created_at":"2026-05-18T00:22:23Z","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":"The Leading Arm (LA) of the Magellanic Stream is a vast debris field of H I clouds connecting the Milky Way and the Magellanic Clouds. It represents an example of active gas accretion onto the Galaxy. Previously only one chemical abundance measurement had been made in the LA. Here we present chemical abundance measurements using Hubble Space Telescope/Cosmic Origins Spectrograph Green Bank Telescope spectra of four sightlines passing through the LA, and three nearby sightlines that may trace outer fragments of the LA. We find low oxygen abundances, ranging from 4.0(+4.0,-2.0) percent solar to ","authors_text":"Andrew J. Fox, Bart P. Wakker, Dana I. Casetti-Dinescu, Elena D'Onghia, Felix J. Lockman, Jacqueline Antwi-Danso, J. Christopher Howk, Kathleen A. Barger, Nicolas Lehner, Paul A. Crowther, Philipp Richter","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-01-19T15:18:30Z","title":"Chemical Abundances in the Leading Arm of the Magellanic Stream"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.06446","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":"sha256:39eed55fa7483549deea3d979188ef3b39a89ae15914f9687fb91ec2eb95d3f2","target":"record","created_at":"2026-05-18T00:22:23Z","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":"74b97b76b71ab86359f9c0ba004f2ea410ee614febe3cfeae2a34b91d1fbc47a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-01-19T15:18:30Z","title_canon_sha256":"aad535e4359d35a0661a1f78a452770b58905f2050ba54959e815b65b5a84e7d"},"schema_version":"1.0","source":{"id":"1801.06446","kind":"arxiv","version":1}},"canonical_sha256":"803f904171a26230bdba9c183e185cd87579798348785436669f1330be7b5586","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"803f904171a26230bdba9c183e185cd87579798348785436669f1330be7b5586","first_computed_at":"2026-05-18T00:22:23.027097Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:22:23.027097Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"67VGIO5YR55pilC/nWkP+tfPXzzsYY80nrDGWYP57arsilFViWvR+d8VQ/RX/7v/k/7wEm4zofclUeKkPkiyAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:22:23.027897Z","signed_message":"canonical_sha256_bytes"},"source_id":"1801.06446","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:39eed55fa7483549deea3d979188ef3b39a89ae15914f9687fb91ec2eb95d3f2","sha256:a6ba7cf0934168c3c430a01df35d0735facddcefc23bd7d250f7d37df9d52aa1"],"state_sha256":"0a1e20250d0eebf41ce7e035ed1ad03ee3fa4474c4753a382d63aafca3b54b26"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IbkwuagjAUqLMFvjNOY9A77D64Cc0tqhbHdbVZqiLL/7JZct4PWF6/IdVanonp3/QXV5reu4iSik8q184wAHAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T07:22:53.963087Z","bundle_sha256":"2455ae0b5a4f35bb5e71404eb894266e7fe7f3af4d5187ab35bc1e20bb47c110"}}