{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:QNEYVAG43I74T2IC5XENVCWDUW","short_pith_number":"pith:QNEYVAG4","canonical_record":{"source":{"id":"1403.4339","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-03-18T04:26:13Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"ed39c32df5334f2c24272f362919726ee2aa6bbd0fcacc36089eeca097aa07af","abstract_canon_sha256":"1d9da7db396f3241aa39216fbb0d4e9b772d1e30d01b80d399909649041d6b9a"},"schema_version":"1.0"},"canonical_sha256":"83498a80dcda3fc9e902edc8da8ac3a5860c50a018d5a085aa15244fcc9f9c26","source":{"kind":"arxiv","id":"1403.4339","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1403.4339","created_at":"2026-05-18T01:44:00Z"},{"alias_kind":"arxiv_version","alias_value":"1403.4339v2","created_at":"2026-05-18T01:44:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1403.4339","created_at":"2026-05-18T01:44:00Z"},{"alias_kind":"pith_short_12","alias_value":"QNEYVAG43I74","created_at":"2026-05-18T12:28:46Z"},{"alias_kind":"pith_short_16","alias_value":"QNEYVAG43I74T2IC","created_at":"2026-05-18T12:28:46Z"},{"alias_kind":"pith_short_8","alias_value":"QNEYVAG4","created_at":"2026-05-18T12:28:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:QNEYVAG43I74T2IC5XENVCWDUW","target":"record","payload":{"canonical_record":{"source":{"id":"1403.4339","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-03-18T04:26:13Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"ed39c32df5334f2c24272f362919726ee2aa6bbd0fcacc36089eeca097aa07af","abstract_canon_sha256":"1d9da7db396f3241aa39216fbb0d4e9b772d1e30d01b80d399909649041d6b9a"},"schema_version":"1.0"},"canonical_sha256":"83498a80dcda3fc9e902edc8da8ac3a5860c50a018d5a085aa15244fcc9f9c26","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:44:00.129869Z","signature_b64":"1RkBmKiJ0CyFDSOtNMJfuRDC4u5RgJIp+lW96PofTBWlrW4koZvQGaFfl0LMxAm1FB0oB8pwqoabcmk0QpKRBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"83498a80dcda3fc9e902edc8da8ac3a5860c50a018d5a085aa15244fcc9f9c26","last_reissued_at":"2026-05-18T01:44:00.129128Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:44:00.129128Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1403.4339","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":"2026-05-18T01:44:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"s6hNSbUO+KCzT1fIRq74ytan+Yrk4MQjeL5xZ4L6NnK3M4eNaOleeUb2JRorqCBqHjgCOo6jQCBPz8tQVXA4DA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T15:22:12.252746Z"},"content_sha256":"fb8420e89dd9fa508b841829f73ccf0d8cc5629a94c1c400059554dcd20729f9","schema_version":"1.0","event_id":"sha256:fb8420e89dd9fa508b841829f73ccf0d8cc5629a94c1c400059554dcd20729f9"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:QNEYVAG43I74T2IC5XENVCWDUW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The nature of Damped Lyman-{\\alpha} and MgII absorbers explored with their dust contents","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.GA","authors_text":"Brice M\\'enard, Masataka Fukugita","submitted_at":"2014-03-18T04:26:13Z","abstract_excerpt":"We estimate the abundance of dust in damped Lyman-{\\alpha} absorbers (DLAs) by statistically measuring the excess reddening they induce on their background quasars. We detect systematic reddening behind DLA consistent with the SMC type reddening curve, but it is inconsistent with the Milky Way type reddening. We find that the derived dust-to-gas ratio is, on average, inversely proportional to the column density of neutral hydrogen, implying that the amount of dust is constant, irrespective of the column density of hydrogen. It means that the average metallicity is inversely proportional to the"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1403.4339","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":"2026-05-18T01:44:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hxudbMoiXoj2IlYpzKCx/xfOKKKzH/LUXVyPTmhl3P+kfS93W67br0Kkp2xYmag9HM/+h6cfUsY1qb9yLCTPDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T15:22:12.253102Z"},"content_sha256":"7ff9900ae7afb39494b28e18af6a9a64e9ced62b6ddf8be122947846fa6bbd5e","schema_version":"1.0","event_id":"sha256:7ff9900ae7afb39494b28e18af6a9a64e9ced62b6ddf8be122947846fa6bbd5e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QNEYVAG43I74T2IC5XENVCWDUW/bundle.json","state_url":"https://pith.science/pith/QNEYVAG43I74T2IC5XENVCWDUW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QNEYVAG43I74T2IC5XENVCWDUW/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":"2026-05-25T15:22:12Z","links":{"resolver":"https://pith.science/pith/QNEYVAG43I74T2IC5XENVCWDUW","bundle":"https://pith.science/pith/QNEYVAG43I74T2IC5XENVCWDUW/bundle.json","state":"https://pith.science/pith/QNEYVAG43I74T2IC5XENVCWDUW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QNEYVAG43I74T2IC5XENVCWDUW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:QNEYVAG43I74T2IC5XENVCWDUW","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":"1d9da7db396f3241aa39216fbb0d4e9b772d1e30d01b80d399909649041d6b9a","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-03-18T04:26:13Z","title_canon_sha256":"ed39c32df5334f2c24272f362919726ee2aa6bbd0fcacc36089eeca097aa07af"},"schema_version":"1.0","source":{"id":"1403.4339","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1403.4339","created_at":"2026-05-18T01:44:00Z"},{"alias_kind":"arxiv_version","alias_value":"1403.4339v2","created_at":"2026-05-18T01:44:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1403.4339","created_at":"2026-05-18T01:44:00Z"},{"alias_kind":"pith_short_12","alias_value":"QNEYVAG43I74","created_at":"2026-05-18T12:28:46Z"},{"alias_kind":"pith_short_16","alias_value":"QNEYVAG43I74T2IC","created_at":"2026-05-18T12:28:46Z"},{"alias_kind":"pith_short_8","alias_value":"QNEYVAG4","created_at":"2026-05-18T12:28:46Z"}],"graph_snapshots":[{"event_id":"sha256:7ff9900ae7afb39494b28e18af6a9a64e9ced62b6ddf8be122947846fa6bbd5e","target":"graph","created_at":"2026-05-18T01:44:00Z","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":"We estimate the abundance of dust in damped Lyman-{\\alpha} absorbers (DLAs) by statistically measuring the excess reddening they induce on their background quasars. We detect systematic reddening behind DLA consistent with the SMC type reddening curve, but it is inconsistent with the Milky Way type reddening. We find that the derived dust-to-gas ratio is, on average, inversely proportional to the column density of neutral hydrogen, implying that the amount of dust is constant, irrespective of the column density of hydrogen. It means that the average metallicity is inversely proportional to the","authors_text":"Brice M\\'enard, Masataka Fukugita","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-03-18T04:26:13Z","title":"The nature of Damped Lyman-{\\alpha} and MgII absorbers explored with their dust contents"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1403.4339","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:fb8420e89dd9fa508b841829f73ccf0d8cc5629a94c1c400059554dcd20729f9","target":"record","created_at":"2026-05-18T01:44:00Z","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":"1d9da7db396f3241aa39216fbb0d4e9b772d1e30d01b80d399909649041d6b9a","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-03-18T04:26:13Z","title_canon_sha256":"ed39c32df5334f2c24272f362919726ee2aa6bbd0fcacc36089eeca097aa07af"},"schema_version":"1.0","source":{"id":"1403.4339","kind":"arxiv","version":2}},"canonical_sha256":"83498a80dcda3fc9e902edc8da8ac3a5860c50a018d5a085aa15244fcc9f9c26","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"83498a80dcda3fc9e902edc8da8ac3a5860c50a018d5a085aa15244fcc9f9c26","first_computed_at":"2026-05-18T01:44:00.129128Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:44:00.129128Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"1RkBmKiJ0CyFDSOtNMJfuRDC4u5RgJIp+lW96PofTBWlrW4koZvQGaFfl0LMxAm1FB0oB8pwqoabcmk0QpKRBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:44:00.129869Z","signed_message":"canonical_sha256_bytes"},"source_id":"1403.4339","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fb8420e89dd9fa508b841829f73ccf0d8cc5629a94c1c400059554dcd20729f9","sha256:7ff9900ae7afb39494b28e18af6a9a64e9ced62b6ddf8be122947846fa6bbd5e"],"state_sha256":"07e04463b4f9eaa1ee92e6d7213111f4473273bffcc8542b6a6d6e2d5633ba15"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+3+UL8aFTMPkwY08SOG4P2I6X92l9R8isXLdHidrA9HV6UfTql+Xpe7/FGulibLNhmD6QN3/7woq/URjJnn8Bg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T15:22:12.256139Z","bundle_sha256":"8fa52fb53f53755dea3ee37bbcdbf7b0cda7a016435a11e0406a1c5c85ae5672"}}