{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:F3KV3GKYFCTGMILM5IKAJZMTDH","short_pith_number":"pith:F3KV3GKY","canonical_record":{"source":{"id":"1204.1978","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-04-09T20:00:05Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"58827587e03ed9c6d4d3bf7ddf0e37a476c0ac9d56e3c871fa7ffb1e9ebac91e","abstract_canon_sha256":"a6b38d58a5818e6123a02fd29ead03532b24a05eea8ee9ca89266deb988a596e"},"schema_version":"1.0"},"canonical_sha256":"2ed55d995828a666216cea1404e59319f3e5a8d83a70be00a7e2a4e4c84fc920","source":{"kind":"arxiv","id":"1204.1978","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1204.1978","created_at":"2026-05-18T01:57:55Z"},{"alias_kind":"arxiv_version","alias_value":"1204.1978v2","created_at":"2026-05-18T01:57:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1204.1978","created_at":"2026-05-18T01:57:55Z"},{"alias_kind":"pith_short_12","alias_value":"F3KV3GKYFCTG","created_at":"2026-05-18T12:27:04Z"},{"alias_kind":"pith_short_16","alias_value":"F3KV3GKYFCTGMILM","created_at":"2026-05-18T12:27:04Z"},{"alias_kind":"pith_short_8","alias_value":"F3KV3GKY","created_at":"2026-05-18T12:27:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:F3KV3GKYFCTGMILM5IKAJZMTDH","target":"record","payload":{"canonical_record":{"source":{"id":"1204.1978","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-04-09T20:00:05Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"58827587e03ed9c6d4d3bf7ddf0e37a476c0ac9d56e3c871fa7ffb1e9ebac91e","abstract_canon_sha256":"a6b38d58a5818e6123a02fd29ead03532b24a05eea8ee9ca89266deb988a596e"},"schema_version":"1.0"},"canonical_sha256":"2ed55d995828a666216cea1404e59319f3e5a8d83a70be00a7e2a4e4c84fc920","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:57:55.605029Z","signature_b64":"fUF4+Ue2bggyAsyXvZ9p75DN1tWarDNGTwAYMBAokGw+FsIAsLXw6b/81cSe7YJLIpMojn5v/mcMZ/8uqR/YCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2ed55d995828a666216cea1404e59319f3e5a8d83a70be00a7e2a4e4c84fc920","last_reissued_at":"2026-05-18T01:57:55.604501Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:57:55.604501Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1204.1978","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":"2026-05-18T01:57:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8zjt/lNXf1t0460bho040u10PTERLafK2qfjl8RH6ZtKX7Ji2fIiHvFtai0SLo7F9kfFqKn/uPHAIJyfLxTmCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T04:31:22.618661Z"},"content_sha256":"032cb65c85d1d6c7313bf5cddc69b0a539298cd16db41bac970ee121687743d3","schema_version":"1.0","event_id":"sha256:032cb65c85d1d6c7313bf5cddc69b0a539298cd16db41bac970ee121687743d3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:F3KV3GKYFCTGMILM5IKAJZMTDH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Cosmic dust in MgII absorbers","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.CO","authors_text":"Brice M\\'enard, Masataka Fukugita","submitted_at":"2012-04-09T20:00:05Z","abstract_excerpt":"MgII absorbers induce reddening on background quasars. We measure this effect and infer the cosmic density of dust residing in these systems to be \\Omega\\ ~ 2e-6, in units of the critical density of the Universe, which is comparable to the amount of dust found in galactic disks or about half the amount inferred to exist outside galaxies. We also estimate the neutral hydrogen abundance in MgII clouds to be \\Omega\\ ~ 1.5e-4, which is approximately 5% of hydrogen in stars in galaxies. This implies a dust-to-gas mass ratio for MgII clouds of about 1/100, which is similar to the value for normal ga"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1204.1978","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":"2026-05-18T01:57:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"e7vy1W5+bonK7UdL6RhjOKWnAsaPqIMfWUXChI+jKQ15QJzTTP/k6x8x6m1gSIMQ8FglhhdS/D0ukHN1w1tkDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T04:31:22.619341Z"},"content_sha256":"a453643833b0403d144d31cb3bbacd8f30b59978c2e045be85a1ceffe32e194b","schema_version":"1.0","event_id":"sha256:a453643833b0403d144d31cb3bbacd8f30b59978c2e045be85a1ceffe32e194b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/F3KV3GKYFCTGMILM5IKAJZMTDH/bundle.json","state_url":"https://pith.science/pith/F3KV3GKYFCTGMILM5IKAJZMTDH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/F3KV3GKYFCTGMILM5IKAJZMTDH/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":"2026-05-26T04:31:22Z","links":{"resolver":"https://pith.science/pith/F3KV3GKYFCTGMILM5IKAJZMTDH","bundle":"https://pith.science/pith/F3KV3GKYFCTGMILM5IKAJZMTDH/bundle.json","state":"https://pith.science/pith/F3KV3GKYFCTGMILM5IKAJZMTDH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/F3KV3GKYFCTGMILM5IKAJZMTDH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:F3KV3GKYFCTGMILM5IKAJZMTDH","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":"a6b38d58a5818e6123a02fd29ead03532b24a05eea8ee9ca89266deb988a596e","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-04-09T20:00:05Z","title_canon_sha256":"58827587e03ed9c6d4d3bf7ddf0e37a476c0ac9d56e3c871fa7ffb1e9ebac91e"},"schema_version":"1.0","source":{"id":"1204.1978","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1204.1978","created_at":"2026-05-18T01:57:55Z"},{"alias_kind":"arxiv_version","alias_value":"1204.1978v2","created_at":"2026-05-18T01:57:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1204.1978","created_at":"2026-05-18T01:57:55Z"},{"alias_kind":"pith_short_12","alias_value":"F3KV3GKYFCTG","created_at":"2026-05-18T12:27:04Z"},{"alias_kind":"pith_short_16","alias_value":"F3KV3GKYFCTGMILM","created_at":"2026-05-18T12:27:04Z"},{"alias_kind":"pith_short_8","alias_value":"F3KV3GKY","created_at":"2026-05-18T12:27:04Z"}],"graph_snapshots":[{"event_id":"sha256:a453643833b0403d144d31cb3bbacd8f30b59978c2e045be85a1ceffe32e194b","target":"graph","created_at":"2026-05-18T01:57:55Z","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":"MgII absorbers induce reddening on background quasars. We measure this effect and infer the cosmic density of dust residing in these systems to be \\Omega\\ ~ 2e-6, in units of the critical density of the Universe, which is comparable to the amount of dust found in galactic disks or about half the amount inferred to exist outside galaxies. We also estimate the neutral hydrogen abundance in MgII clouds to be \\Omega\\ ~ 1.5e-4, which is approximately 5% of hydrogen in stars in galaxies. This implies a dust-to-gas mass ratio for MgII clouds of about 1/100, which is similar to the value for normal ga","authors_text":"Brice M\\'enard, Masataka Fukugita","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-04-09T20:00:05Z","title":"Cosmic dust in MgII absorbers"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1204.1978","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":"sha256:032cb65c85d1d6c7313bf5cddc69b0a539298cd16db41bac970ee121687743d3","target":"record","created_at":"2026-05-18T01:57:55Z","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":"a6b38d58a5818e6123a02fd29ead03532b24a05eea8ee9ca89266deb988a596e","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-04-09T20:00:05Z","title_canon_sha256":"58827587e03ed9c6d4d3bf7ddf0e37a476c0ac9d56e3c871fa7ffb1e9ebac91e"},"schema_version":"1.0","source":{"id":"1204.1978","kind":"arxiv","version":2}},"canonical_sha256":"2ed55d995828a666216cea1404e59319f3e5a8d83a70be00a7e2a4e4c84fc920","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2ed55d995828a666216cea1404e59319f3e5a8d83a70be00a7e2a4e4c84fc920","first_computed_at":"2026-05-18T01:57:55.604501Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:57:55.604501Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"fUF4+Ue2bggyAsyXvZ9p75DN1tWarDNGTwAYMBAokGw+FsIAsLXw6b/81cSe7YJLIpMojn5v/mcMZ/8uqR/YCw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:57:55.605029Z","signed_message":"canonical_sha256_bytes"},"source_id":"1204.1978","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:032cb65c85d1d6c7313bf5cddc69b0a539298cd16db41bac970ee121687743d3","sha256:a453643833b0403d144d31cb3bbacd8f30b59978c2e045be85a1ceffe32e194b"],"state_sha256":"e837e257c7017bd9c2db9f19fa2526553397837abf6955c35ddfc9c5a87e9edd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oCkDcwfbUs/L5hs7VHgOuIUAEiea607A6bV3S+vPQBlx/6sH9I1AADjADSxyOm7smvQkay0fT9rMV65IrpiQAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T04:31:22.622887Z","bundle_sha256":"f6fefedd2b76e4de7469c3380c15115e9414003dc1598524424f065f5f0de1f7"}}