{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:C4RFS45FX3LTQEWW6XKBU4AXTP","short_pith_number":"pith:C4RFS45F","canonical_record":{"source":{"id":"1903.11630","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-03-27T18:09:38Z","cross_cats_sorted":[],"title_canon_sha256":"7ab9499dce98f8233d8eac1e43f1a24152ecfc405ac66ee8cc93ac2c9eaace0b","abstract_canon_sha256":"023206524ebc39c591c867888ac81d3520707b8d0e581dac29b5b5d0e447c292"},"schema_version":"1.0"},"canonical_sha256":"17225973a5bed73812d6f5d41a70179bf17e5abdb8823d856695b0fbf74489ab","source":{"kind":"arxiv","id":"1903.11630","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1903.11630","created_at":"2026-05-17T23:50:02Z"},{"alias_kind":"arxiv_version","alias_value":"1903.11630v1","created_at":"2026-05-17T23:50:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1903.11630","created_at":"2026-05-17T23:50:02Z"},{"alias_kind":"pith_short_12","alias_value":"C4RFS45FX3LT","created_at":"2026-05-18T12:33:12Z"},{"alias_kind":"pith_short_16","alias_value":"C4RFS45FX3LTQEWW","created_at":"2026-05-18T12:33:12Z"},{"alias_kind":"pith_short_8","alias_value":"C4RFS45F","created_at":"2026-05-18T12:33:12Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:C4RFS45FX3LTQEWW6XKBU4AXTP","target":"record","payload":{"canonical_record":{"source":{"id":"1903.11630","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-03-27T18:09:38Z","cross_cats_sorted":[],"title_canon_sha256":"7ab9499dce98f8233d8eac1e43f1a24152ecfc405ac66ee8cc93ac2c9eaace0b","abstract_canon_sha256":"023206524ebc39c591c867888ac81d3520707b8d0e581dac29b5b5d0e447c292"},"schema_version":"1.0"},"canonical_sha256":"17225973a5bed73812d6f5d41a70179bf17e5abdb8823d856695b0fbf74489ab","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:50:02.171208Z","signature_b64":"qAw06B98iBVTxecVQRnCBflXHc6ZojIM4emDpfnzWCs/xuDn07Xl4QicxgJsqtmCH1/OWqd0fHlUsbl5rHlcAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"17225973a5bed73812d6f5d41a70179bf17e5abdb8823d856695b0fbf74489ab","last_reissued_at":"2026-05-17T23:50:02.170646Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:50:02.170646Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1903.11630","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":"2026-05-17T23:50:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wgFHxtWwDNcXExVi/9kHbLVgWvlApVTjS4YqKEIK3pB7ekBxULxarQJ8oYctjjdroUPCiE95ZHXrYTb8qDyyDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-10T01:23:20.228925Z"},"content_sha256":"4dfcf1469800f746cc8c32eab713c7da896e9ffef453a32205994b5ce573a91f","schema_version":"1.0","event_id":"sha256:4dfcf1469800f746cc8c32eab713c7da896e9ffef453a32205994b5ce573a91f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:C4RFS45FX3LTQEWW6XKBU4AXTP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Survey of Hot Gas in the Universe","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Alexey Vikhlinin (Harvard-Smithsonian), Andrew Ptak (NASA GSFC), Benjamin D. Oppenheimer (University of Colorado), Edmund Hodges-Kluck (University of Maryland/NASA GSFC), Jiangtao Li (University of Michigan), Joel N. Bregman (University of Michigan), Juna Kollmeier (Carnegie), Laura Brenneman (Harvard-Smithsonian), Nastasha Wijers (Leiden), Pasquale Temi (NASA Ames), Randall Smith (Harvard-Smithsonian)","submitted_at":"2019-03-27T18:09:38Z","abstract_excerpt":"A large fraction of the baryons and most of the metals in the Universe are unaccounted for. They likely lie in extended galaxy halos, galaxy groups, and the cosmic web, and measuring their nature is essential to understanding galaxy formation. These environments have virial temperatures >10^5.5 K, so the gas should be visible in X-rays. Here we show the breakthrough capabilities of grating spectrometers to 1) detect these reservoirs of hidden metals and mass, and 2) quantify hot gas flows, turbulence, and rotation around the Milky Way and external galaxies. Grating spectrometers are essential "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1903.11630","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":"2026-05-17T23:50:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3jR8ZEowkd90jQ3UwFx9C8PCa3c+8HV/BIRb7aw2zslwl+o0CLrZN8fLH5YxuU30fzMXD4u9j9rAehjar55TBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-10T01:23:20.229754Z"},"content_sha256":"068cdc8eb92f4d51eeea5df30fc3199d26a5d31c49fc54ca635dd53c941e7e60","schema_version":"1.0","event_id":"sha256:068cdc8eb92f4d51eeea5df30fc3199d26a5d31c49fc54ca635dd53c941e7e60"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/C4RFS45FX3LTQEWW6XKBU4AXTP/bundle.json","state_url":"https://pith.science/pith/C4RFS45FX3LTQEWW6XKBU4AXTP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/C4RFS45FX3LTQEWW6XKBU4AXTP/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":"2026-06-10T01:23:20Z","links":{"resolver":"https://pith.science/pith/C4RFS45FX3LTQEWW6XKBU4AXTP","bundle":"https://pith.science/pith/C4RFS45FX3LTQEWW6XKBU4AXTP/bundle.json","state":"https://pith.science/pith/C4RFS45FX3LTQEWW6XKBU4AXTP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/C4RFS45FX3LTQEWW6XKBU4AXTP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:C4RFS45FX3LTQEWW6XKBU4AXTP","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":"023206524ebc39c591c867888ac81d3520707b8d0e581dac29b5b5d0e447c292","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-03-27T18:09:38Z","title_canon_sha256":"7ab9499dce98f8233d8eac1e43f1a24152ecfc405ac66ee8cc93ac2c9eaace0b"},"schema_version":"1.0","source":{"id":"1903.11630","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1903.11630","created_at":"2026-05-17T23:50:02Z"},{"alias_kind":"arxiv_version","alias_value":"1903.11630v1","created_at":"2026-05-17T23:50:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1903.11630","created_at":"2026-05-17T23:50:02Z"},{"alias_kind":"pith_short_12","alias_value":"C4RFS45FX3LT","created_at":"2026-05-18T12:33:12Z"},{"alias_kind":"pith_short_16","alias_value":"C4RFS45FX3LTQEWW","created_at":"2026-05-18T12:33:12Z"},{"alias_kind":"pith_short_8","alias_value":"C4RFS45F","created_at":"2026-05-18T12:33:12Z"}],"graph_snapshots":[{"event_id":"sha256:068cdc8eb92f4d51eeea5df30fc3199d26a5d31c49fc54ca635dd53c941e7e60","target":"graph","created_at":"2026-05-17T23:50:02Z","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":"A large fraction of the baryons and most of the metals in the Universe are unaccounted for. They likely lie in extended galaxy halos, galaxy groups, and the cosmic web, and measuring their nature is essential to understanding galaxy formation. These environments have virial temperatures >10^5.5 K, so the gas should be visible in X-rays. Here we show the breakthrough capabilities of grating spectrometers to 1) detect these reservoirs of hidden metals and mass, and 2) quantify hot gas flows, turbulence, and rotation around the Milky Way and external galaxies. Grating spectrometers are essential ","authors_text":"Alexey Vikhlinin (Harvard-Smithsonian), Andrew Ptak (NASA GSFC), Benjamin D. Oppenheimer (University of Colorado), Edmund Hodges-Kluck (University of Maryland/NASA GSFC), Jiangtao Li (University of Michigan), Joel N. Bregman (University of Michigan), Juna Kollmeier (Carnegie), Laura Brenneman (Harvard-Smithsonian), Nastasha Wijers (Leiden), Pasquale Temi (NASA Ames), Randall Smith (Harvard-Smithsonian)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-03-27T18:09:38Z","title":"A Survey of Hot Gas in the Universe"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1903.11630","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":"sha256:4dfcf1469800f746cc8c32eab713c7da896e9ffef453a32205994b5ce573a91f","target":"record","created_at":"2026-05-17T23:50:02Z","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":"023206524ebc39c591c867888ac81d3520707b8d0e581dac29b5b5d0e447c292","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-03-27T18:09:38Z","title_canon_sha256":"7ab9499dce98f8233d8eac1e43f1a24152ecfc405ac66ee8cc93ac2c9eaace0b"},"schema_version":"1.0","source":{"id":"1903.11630","kind":"arxiv","version":1}},"canonical_sha256":"17225973a5bed73812d6f5d41a70179bf17e5abdb8823d856695b0fbf74489ab","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"17225973a5bed73812d6f5d41a70179bf17e5abdb8823d856695b0fbf74489ab","first_computed_at":"2026-05-17T23:50:02.170646Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:50:02.170646Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"qAw06B98iBVTxecVQRnCBflXHc6ZojIM4emDpfnzWCs/xuDn07Xl4QicxgJsqtmCH1/OWqd0fHlUsbl5rHlcAg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:50:02.171208Z","signed_message":"canonical_sha256_bytes"},"source_id":"1903.11630","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4dfcf1469800f746cc8c32eab713c7da896e9ffef453a32205994b5ce573a91f","sha256:068cdc8eb92f4d51eeea5df30fc3199d26a5d31c49fc54ca635dd53c941e7e60"],"state_sha256":"c9d502349c1441d0da4a69ed12841eefe5b29ba1a5f07d76fe69b5bccf613de5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"T1M1IC0hTkfLXO21fsALn4wdgmsQgCYObCaqVVLPsdbx5YDM1zkXCe3hlY+SA8dZu0lGhgWzXXGiRauD60zJBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-10T01:23:20.234423Z","bundle_sha256":"6b0de09fdcf4788a26d29db2f9936a0048e5fd4112075b71e75f767bfe54975e"}}