{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:MLWJTWIB6Z65LIHWWI2T6XEJG3","short_pith_number":"pith:MLWJTWIB","canonical_record":{"source":{"id":"1801.07715","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-01-23T19:00:00Z","cross_cats_sorted":[],"title_canon_sha256":"64cb4e4d3d1d1c8b3eed0cf42f3d19476986afe2e546d33630d799c0ef50a475","abstract_canon_sha256":"27ab2e524d0bc6e474ff4ab50686a5f444e09e3d9ae471f395d0fbaf1ec0941b"},"schema_version":"1.0"},"canonical_sha256":"62ec99d901f67dd5a0f6b2353f5c8936e484febb185621ca0f19d0acde443325","source":{"kind":"arxiv","id":"1801.07715","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.07715","created_at":"2026-05-18T00:23:44Z"},{"alias_kind":"arxiv_version","alias_value":"1801.07715v1","created_at":"2026-05-18T00:23:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.07715","created_at":"2026-05-18T00:23:44Z"},{"alias_kind":"pith_short_12","alias_value":"MLWJTWIB6Z65","created_at":"2026-05-18T12:32:37Z"},{"alias_kind":"pith_short_16","alias_value":"MLWJTWIB6Z65LIHW","created_at":"2026-05-18T12:32:37Z"},{"alias_kind":"pith_short_8","alias_value":"MLWJTWIB","created_at":"2026-05-18T12:32:37Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:MLWJTWIB6Z65LIHWWI2T6XEJG3","target":"record","payload":{"canonical_record":{"source":{"id":"1801.07715","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-01-23T19:00:00Z","cross_cats_sorted":[],"title_canon_sha256":"64cb4e4d3d1d1c8b3eed0cf42f3d19476986afe2e546d33630d799c0ef50a475","abstract_canon_sha256":"27ab2e524d0bc6e474ff4ab50686a5f444e09e3d9ae471f395d0fbaf1ec0941b"},"schema_version":"1.0"},"canonical_sha256":"62ec99d901f67dd5a0f6b2353f5c8936e484febb185621ca0f19d0acde443325","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:23:44.815560Z","signature_b64":"WsX7WClVd+VBL85EJknsQAFXQ62lVFcvdasoUlUrDTzOdUDs8Om3ub71ny2ixKGAfWMX+WrE+KEAUOyfsJ9QDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"62ec99d901f67dd5a0f6b2353f5c8936e484febb185621ca0f19d0acde443325","last_reissued_at":"2026-05-18T00:23:44.814816Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:23:44.814816Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1801.07715","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":"2026-05-18T00:23:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Y+NgdSNyV/0143Wq7InIXS6huu/h3+bS9Wk4ORGej9HNAYfbAO/LtF2VqFqnto4u7AJtSu5F9yXNLAovdXgvAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T18:50:53.459639Z"},"content_sha256":"91fad2a438a64f200741299a8fd3682cec2cb7b86f4b768614f7949891ae68a5","schema_version":"1.0","event_id":"sha256:91fad2a438a64f200741299a8fd3682cec2cb7b86f4b768614f7949891ae68a5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:MLWJTWIB6Z65LIHWWI2T6XEJG3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Dense gas and star formation in individual Giant Molecular Clouds in M31","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"J. Forbrich, J. Fritz, S. Viaene","submitted_at":"2018-01-23T19:00:00Z","abstract_excerpt":"Studies both of entire galaxies and of local Galactic star formation indicate a dependency of a molecular cloud's star formation rate (SFR) on its dense gas mass. In external galaxies, such measurements are derived from HCN(1-0) observations, usually encompassing many Giant Molecular Clouds (GMCs) at once. The Andromeda galaxy (M31) is a unique laboratory to study the relation of the SFR and HCN emission down to GMC scales at solar-like metallicities. In this work, we correlate our composite SFR determinations with archival HCN, HCO$^+$, and CO observations, resulting in a sample of nine reaso"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.07715","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":"2026-05-18T00:23:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"isZBFQo0V4VYxOLQLP6C/o/qjm9UfHslbQ3TnIF5WdoVsF0ePr+iTTa8cA8tOYHx5XB88BbosUE2fje5yksrAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T18:50:53.459982Z"},"content_sha256":"84805cde10b340c501ab61f9fc049505075e7dddde3db16aae26e957bcdcf5c2","schema_version":"1.0","event_id":"sha256:84805cde10b340c501ab61f9fc049505075e7dddde3db16aae26e957bcdcf5c2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MLWJTWIB6Z65LIHWWI2T6XEJG3/bundle.json","state_url":"https://pith.science/pith/MLWJTWIB6Z65LIHWWI2T6XEJG3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MLWJTWIB6Z65LIHWWI2T6XEJG3/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":"2026-05-30T18:50:53Z","links":{"resolver":"https://pith.science/pith/MLWJTWIB6Z65LIHWWI2T6XEJG3","bundle":"https://pith.science/pith/MLWJTWIB6Z65LIHWWI2T6XEJG3/bundle.json","state":"https://pith.science/pith/MLWJTWIB6Z65LIHWWI2T6XEJG3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MLWJTWIB6Z65LIHWWI2T6XEJG3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:MLWJTWIB6Z65LIHWWI2T6XEJG3","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":"27ab2e524d0bc6e474ff4ab50686a5f444e09e3d9ae471f395d0fbaf1ec0941b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-01-23T19:00:00Z","title_canon_sha256":"64cb4e4d3d1d1c8b3eed0cf42f3d19476986afe2e546d33630d799c0ef50a475"},"schema_version":"1.0","source":{"id":"1801.07715","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.07715","created_at":"2026-05-18T00:23:44Z"},{"alias_kind":"arxiv_version","alias_value":"1801.07715v1","created_at":"2026-05-18T00:23:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.07715","created_at":"2026-05-18T00:23:44Z"},{"alias_kind":"pith_short_12","alias_value":"MLWJTWIB6Z65","created_at":"2026-05-18T12:32:37Z"},{"alias_kind":"pith_short_16","alias_value":"MLWJTWIB6Z65LIHW","created_at":"2026-05-18T12:32:37Z"},{"alias_kind":"pith_short_8","alias_value":"MLWJTWIB","created_at":"2026-05-18T12:32:37Z"}],"graph_snapshots":[{"event_id":"sha256:84805cde10b340c501ab61f9fc049505075e7dddde3db16aae26e957bcdcf5c2","target":"graph","created_at":"2026-05-18T00:23:44Z","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":"Studies both of entire galaxies and of local Galactic star formation indicate a dependency of a molecular cloud's star formation rate (SFR) on its dense gas mass. In external galaxies, such measurements are derived from HCN(1-0) observations, usually encompassing many Giant Molecular Clouds (GMCs) at once. The Andromeda galaxy (M31) is a unique laboratory to study the relation of the SFR and HCN emission down to GMC scales at solar-like metallicities. In this work, we correlate our composite SFR determinations with archival HCN, HCO$^+$, and CO observations, resulting in a sample of nine reaso","authors_text":"J. Forbrich, J. Fritz, S. Viaene","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-01-23T19:00:00Z","title":"Dense gas and star formation in individual Giant Molecular Clouds in M31"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.07715","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":"sha256:91fad2a438a64f200741299a8fd3682cec2cb7b86f4b768614f7949891ae68a5","target":"record","created_at":"2026-05-18T00:23:44Z","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":"27ab2e524d0bc6e474ff4ab50686a5f444e09e3d9ae471f395d0fbaf1ec0941b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-01-23T19:00:00Z","title_canon_sha256":"64cb4e4d3d1d1c8b3eed0cf42f3d19476986afe2e546d33630d799c0ef50a475"},"schema_version":"1.0","source":{"id":"1801.07715","kind":"arxiv","version":1}},"canonical_sha256":"62ec99d901f67dd5a0f6b2353f5c8936e484febb185621ca0f19d0acde443325","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"62ec99d901f67dd5a0f6b2353f5c8936e484febb185621ca0f19d0acde443325","first_computed_at":"2026-05-18T00:23:44.814816Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:23:44.814816Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"WsX7WClVd+VBL85EJknsQAFXQ62lVFcvdasoUlUrDTzOdUDs8Om3ub71ny2ixKGAfWMX+WrE+KEAUOyfsJ9QDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:23:44.815560Z","signed_message":"canonical_sha256_bytes"},"source_id":"1801.07715","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:91fad2a438a64f200741299a8fd3682cec2cb7b86f4b768614f7949891ae68a5","sha256:84805cde10b340c501ab61f9fc049505075e7dddde3db16aae26e957bcdcf5c2"],"state_sha256":"1913756d7b99428a85b4866cdfd102a589bb82e3d6eece2d98aabfbd8d838e63"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"U4dBbfzMI33HiZ9IBFKfH0NwG8qPaOsHnQShmQcXi47Wy8qpZ2veIXBHURwMTPF1DbPkMbNNZ+24ouYs4KNXDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T18:50:53.462030Z","bundle_sha256":"5b780e7a5584bc168e1ab6516c2d7fc965e25f3c078b4fd9873641fa5a67bfcb"}}