{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:Z4NBYHENHRRGVBYLCQUNI5F5QH","short_pith_number":"pith:Z4NBYHEN","canonical_record":{"source":{"id":"1907.08319","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-07-18T23:41:44Z","cross_cats_sorted":[],"title_canon_sha256":"8dee0e0a17e458e747b3f83474aea8cc880db1731749dd2b453bc441c4e0e30a","abstract_canon_sha256":"879c32a2e8598b4df999f9467ece57959bb56697ecf63a59df5115362d702bcb"},"schema_version":"1.0"},"canonical_sha256":"cf1a1c1c8d3c626a870b1428d474bd81edb0b49913efcce411b1614614c72e84","source":{"kind":"arxiv","id":"1907.08319","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.08319","created_at":"2026-07-04T23:55:47Z"},{"alias_kind":"arxiv_version","alias_value":"1907.08319v1","created_at":"2026-07-04T23:55:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.08319","created_at":"2026-07-04T23:55:47Z"},{"alias_kind":"pith_short_12","alias_value":"Z4NBYHENHRRG","created_at":"2026-07-04T23:55:47Z"},{"alias_kind":"pith_short_16","alias_value":"Z4NBYHENHRRGVBYL","created_at":"2026-07-04T23:55:47Z"},{"alias_kind":"pith_short_8","alias_value":"Z4NBYHEN","created_at":"2026-07-04T23:55:47Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:Z4NBYHENHRRGVBYLCQUNI5F5QH","target":"record","payload":{"canonical_record":{"source":{"id":"1907.08319","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-07-18T23:41:44Z","cross_cats_sorted":[],"title_canon_sha256":"8dee0e0a17e458e747b3f83474aea8cc880db1731749dd2b453bc441c4e0e30a","abstract_canon_sha256":"879c32a2e8598b4df999f9467ece57959bb56697ecf63a59df5115362d702bcb"},"schema_version":"1.0"},"canonical_sha256":"cf1a1c1c8d3c626a870b1428d474bd81edb0b49913efcce411b1614614c72e84","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T23:55:47.243125Z","signature_b64":"Taz4QhxyQhfx6H+f773JO6cAJHNlOBxICBWOn9kFMRam2kTy98p3/XWo0JxFM7g91s1y0AOMkw3nYEs1BO2lCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cf1a1c1c8d3c626a870b1428d474bd81edb0b49913efcce411b1614614c72e84","last_reissued_at":"2026-07-04T23:55:47.242655Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T23:55:47.242655Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1907.08319","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":"2026-07-04T23:55:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gS+dq/xuf2KcZvKPrw/Ab1IuoKUaKKK1KBgkM8QuBhONU/DWcYkXmHyESXk3XCyOi8Oc/u3/2llTPrY/ok0UDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-13T05:52:51.065233Z"},"content_sha256":"39905c99dce9c5c2b624d764c0d716d6f1499e2f0c2dda374d4656b80e8d115b","schema_version":"1.0","event_id":"sha256:39905c99dce9c5c2b624d764c0d716d6f1499e2f0c2dda374d4656b80e8d115b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:Z4NBYHENHRRGVBYLCQUNI5F5QH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"ALMA Observations of the Terahertz Spectrum of Sagittarius A*","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Alison Peck, Christiaan D. Brinkerink, Daniel P. Marrone, Geoffrey C. Bower, Heino Falcke, Jason Dexter, Keiichi Asada, Makoto Inoue, Masanori Nakamura, Monika Moscibrodzka, Paul Ho, Ramprasad Rao, Satoki Matsushita, Sera Markoff","submitted_at":"2019-07-18T23:41:44Z","abstract_excerpt":"We present ALMA observations at 233, 678, and 870 GHz of the Galactic Center black hole, Sagittarius A*. These observations reveal a flat spectrum over this frequency range with spectral index $\\alpha \\approx -0.3$, where the flux density $S \\propto \\nu^\\alpha$. We model the submm and far infrared spectrum with a one zone synchrotron model of thermal electrons. We infer electron densities $n = (2-5) \\times 10^6$ cm$^{-3}$, electron temperatures $T_e = (1-3) \\times 10^{11}$ K, and magnetic field strength $B = 10-50$ G. The parameter range can be further constrained using the observed quiescent "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.08319","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1907.08319/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-04T23:55:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eM4RnLCw0BaEWPbfOAI5pr77HX1/HO5bqVex+/KJ3tNyP0smoxdNPBQNioXwoIY/G7+lR+01rJYSabpw3JtnBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-13T05:52:51.066798Z"},"content_sha256":"005dbdbaf17e52a658a95c8b4a8a0cee847351c93138d95192a5a1504b0398be","schema_version":"1.0","event_id":"sha256:005dbdbaf17e52a658a95c8b4a8a0cee847351c93138d95192a5a1504b0398be"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Z4NBYHENHRRGVBYLCQUNI5F5QH/bundle.json","state_url":"https://pith.science/pith/Z4NBYHENHRRGVBYLCQUNI5F5QH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Z4NBYHENHRRGVBYLCQUNI5F5QH/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":"2026-08-13T05:52:51Z","links":{"resolver":"https://pith.science/pith/Z4NBYHENHRRGVBYLCQUNI5F5QH","bundle":"https://pith.science/pith/Z4NBYHENHRRGVBYLCQUNI5F5QH/bundle.json","state":"https://pith.science/pith/Z4NBYHENHRRGVBYLCQUNI5F5QH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Z4NBYHENHRRGVBYLCQUNI5F5QH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:Z4NBYHENHRRGVBYLCQUNI5F5QH","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":"879c32a2e8598b4df999f9467ece57959bb56697ecf63a59df5115362d702bcb","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-07-18T23:41:44Z","title_canon_sha256":"8dee0e0a17e458e747b3f83474aea8cc880db1731749dd2b453bc441c4e0e30a"},"schema_version":"1.0","source":{"id":"1907.08319","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.08319","created_at":"2026-07-04T23:55:47Z"},{"alias_kind":"arxiv_version","alias_value":"1907.08319v1","created_at":"2026-07-04T23:55:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.08319","created_at":"2026-07-04T23:55:47Z"},{"alias_kind":"pith_short_12","alias_value":"Z4NBYHENHRRG","created_at":"2026-07-04T23:55:47Z"},{"alias_kind":"pith_short_16","alias_value":"Z4NBYHENHRRGVBYL","created_at":"2026-07-04T23:55:47Z"},{"alias_kind":"pith_short_8","alias_value":"Z4NBYHEN","created_at":"2026-07-04T23:55:47Z"}],"graph_snapshots":[{"event_id":"sha256:005dbdbaf17e52a658a95c8b4a8a0cee847351c93138d95192a5a1504b0398be","target":"graph","created_at":"2026-07-04T23:55:47Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1907.08319/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present ALMA observations at 233, 678, and 870 GHz of the Galactic Center black hole, Sagittarius A*. These observations reveal a flat spectrum over this frequency range with spectral index $\\alpha \\approx -0.3$, where the flux density $S \\propto \\nu^\\alpha$. We model the submm and far infrared spectrum with a one zone synchrotron model of thermal electrons. We infer electron densities $n = (2-5) \\times 10^6$ cm$^{-3}$, electron temperatures $T_e = (1-3) \\times 10^{11}$ K, and magnetic field strength $B = 10-50$ G. The parameter range can be further constrained using the observed quiescent ","authors_text":"Alison Peck, Christiaan D. Brinkerink, Daniel P. Marrone, Geoffrey C. Bower, Heino Falcke, Jason Dexter, Keiichi Asada, Makoto Inoue, Masanori Nakamura, Monika Moscibrodzka, Paul Ho, Ramprasad Rao, Satoki Matsushita, Sera Markoff","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-07-18T23:41:44Z","title":"ALMA Observations of the Terahertz Spectrum of Sagittarius A*"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.08319","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":"sha256:39905c99dce9c5c2b624d764c0d716d6f1499e2f0c2dda374d4656b80e8d115b","target":"record","created_at":"2026-07-04T23:55:47Z","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":"879c32a2e8598b4df999f9467ece57959bb56697ecf63a59df5115362d702bcb","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-07-18T23:41:44Z","title_canon_sha256":"8dee0e0a17e458e747b3f83474aea8cc880db1731749dd2b453bc441c4e0e30a"},"schema_version":"1.0","source":{"id":"1907.08319","kind":"arxiv","version":1}},"canonical_sha256":"cf1a1c1c8d3c626a870b1428d474bd81edb0b49913efcce411b1614614c72e84","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cf1a1c1c8d3c626a870b1428d474bd81edb0b49913efcce411b1614614c72e84","first_computed_at":"2026-07-04T23:55:47.242655Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T23:55:47.242655Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Taz4QhxyQhfx6H+f773JO6cAJHNlOBxICBWOn9kFMRam2kTy98p3/XWo0JxFM7g91s1y0AOMkw3nYEs1BO2lCA==","signature_status":"signed_v1","signed_at":"2026-07-04T23:55:47.243125Z","signed_message":"canonical_sha256_bytes"},"source_id":"1907.08319","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:39905c99dce9c5c2b624d764c0d716d6f1499e2f0c2dda374d4656b80e8d115b","sha256:005dbdbaf17e52a658a95c8b4a8a0cee847351c93138d95192a5a1504b0398be"],"state_sha256":"ade5ac0a5d381711bc0c8acd678c7f2194d0edfe25d9ba8a51f9e9aa9fcee69c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IufbdFMCcEmJHEGttfK0zzrNzeqfb1JT0pGhfwf88jIaiEqf7IXsAwQleHYBKzIo5joHpSt7RwBPBqby0i5OCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-13T05:52:51.074864Z","bundle_sha256":"05b104d79760e0c22db3fb1bf3a45581baef1681920734aecc8ac0bcd9de62cf"}}