{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2017:ALK6L3Y444DKX2ZKO3V4KSSBPX","short_pith_number":"pith:ALK6L3Y4","schema_version":"1.0","canonical_sha256":"02d5e5ef1ce706abeb2a76ebc54a417dec6a2de532b86921c1783f8acaea0c59","source":{"kind":"arxiv","id":"1706.07109","version":2},"attestation_state":"computed","paper":{"title":"The gas-to-extinction ratio and the gas distribution in the Galaxy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Aigen Li, Hui Zhu, Mengfei Zhang, Wenwu Tian","submitted_at":"2017-06-21T20:07:55Z","abstract_excerpt":"We investigate the relation between the optical extinction ($A_V$) and the hydrogen column density ($N_H$) determined from X-ray observations of a large sample of Galactic sightlines toward 35 supernova remnants, 6 planetary nebulae, and 70 X-ray binaries for which $N_H$ was determined in the literature with solar abundances. We derive an average ratio of ${N_H}/{A_V}=(2.08\\pm0.02)\\times10^{21}{\\rm H\\, cm^{-2}\\, mag^{-1}}$ for the whole Galaxy. We find no correlation between ${N_H}/{A_V}$ and the number density of hydrogen, the distance away from the Galactic centre, and the distance above or "},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1706.07109","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-06-21T20:07:55Z","cross_cats_sorted":[],"title_canon_sha256":"dc0bcd6801493bd5c3fa6ef63789f36ba35724dbfdb7c0418b0efebfa8256402","abstract_canon_sha256":"c6b56ebe2e2bec26acc4745be21f13ee24d1d90298dadaa793208bf1a738ae2f"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:36:31.130063Z","signature_b64":"lbfrTZCpNYTfFDTQKa5yDqdRVPU4aUki5LeJalvD4J6a1Q8dH+Zb8XuyPad1cg3M27T0NO0ojm3H4T34ABcsBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"02d5e5ef1ce706abeb2a76ebc54a417dec6a2de532b86921c1783f8acaea0c59","last_reissued_at":"2026-05-18T00:36:31.129525Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:36:31.129525Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The gas-to-extinction ratio and the gas distribution in the Galaxy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Aigen Li, Hui Zhu, Mengfei Zhang, Wenwu Tian","submitted_at":"2017-06-21T20:07:55Z","abstract_excerpt":"We investigate the relation between the optical extinction ($A_V$) and the hydrogen column density ($N_H$) determined from X-ray observations of a large sample of Galactic sightlines toward 35 supernova remnants, 6 planetary nebulae, and 70 X-ray binaries for which $N_H$ was determined in the literature with solar abundances. We derive an average ratio of ${N_H}/{A_V}=(2.08\\pm0.02)\\times10^{21}{\\rm H\\, cm^{-2}\\, mag^{-1}}$ for the whole Galaxy. We find no correlation between ${N_H}/{A_V}$ and the number density of hydrogen, the distance away from the Galactic centre, and the distance above or "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1706.07109","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1706.07109","created_at":"2026-05-18T00:36:31.129615+00:00"},{"alias_kind":"arxiv_version","alias_value":"1706.07109v2","created_at":"2026-05-18T00:36:31.129615+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1706.07109","created_at":"2026-05-18T00:36:31.129615+00:00"},{"alias_kind":"pith_short_12","alias_value":"ALK6L3Y444DK","created_at":"2026-05-18T12:31:05.417338+00:00"},{"alias_kind":"pith_short_16","alias_value":"ALK6L3Y444DKX2ZK","created_at":"2026-05-18T12:31:05.417338+00:00"},{"alias_kind":"pith_short_8","alias_value":"ALK6L3Y4","created_at":"2026-05-18T12:31:05.417338+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/ALK6L3Y444DKX2ZKO3V4KSSBPX","json":"https://pith.science/pith/ALK6L3Y444DKX2ZKO3V4KSSBPX.json","graph_json":"https://pith.science/api/pith-number/ALK6L3Y444DKX2ZKO3V4KSSBPX/graph.json","events_json":"https://pith.science/api/pith-number/ALK6L3Y444DKX2ZKO3V4KSSBPX/events.json","paper":"https://pith.science/paper/ALK6L3Y4"},"agent_actions":{"view_html":"https://pith.science/pith/ALK6L3Y444DKX2ZKO3V4KSSBPX","download_json":"https://pith.science/pith/ALK6L3Y444DKX2ZKO3V4KSSBPX.json","view_paper":"https://pith.science/paper/ALK6L3Y4","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1706.07109&json=true","fetch_graph":"https://pith.science/api/pith-number/ALK6L3Y444DKX2ZKO3V4KSSBPX/graph.json","fetch_events":"https://pith.science/api/pith-number/ALK6L3Y444DKX2ZKO3V4KSSBPX/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/ALK6L3Y444DKX2ZKO3V4KSSBPX/action/timestamp_anchor","attest_storage":"https://pith.science/pith/ALK6L3Y444DKX2ZKO3V4KSSBPX/action/storage_attestation","attest_author":"https://pith.science/pith/ALK6L3Y444DKX2ZKO3V4KSSBPX/action/author_attestation","sign_citation":"https://pith.science/pith/ALK6L3Y444DKX2ZKO3V4KSSBPX/action/citation_signature","submit_replication":"https://pith.science/pith/ALK6L3Y444DKX2ZKO3V4KSSBPX/action/replication_record"}},"created_at":"2026-05-18T00:36:31.129615+00:00","updated_at":"2026-05-18T00:36:31.129615+00:00"}