{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:V6Y5SKW5VIBNLJ7RPRWQ67U7B3","short_pith_number":"pith:V6Y5SKW5","schema_version":"1.0","canonical_sha256":"afb1d92addaa02d5a7f17c6d0f7e9f0ec7882d8231a5793fed92bb4d71b075a7","source":{"kind":"arxiv","id":"1902.02377","version":1},"attestation_state":"computed","paper":{"title":"Testing the Evolutionary Link between Type 1 and Type 2 Quasars with Measurements of the Interstellar Medium","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Jinyi Shangguan, Luis C. Ho","submitted_at":"2019-02-06T19:46:33Z","abstract_excerpt":"In a popular scenario for the coevolution of massive black holes and galaxies, major mergers of gas-rich galaxies fuel vigorous star formation and obscured (type 2) quasar activity until energy feedback from the active galactic nucleus clears away the gas and dust to reveal an unobscured (type 1) quasar. Under this scenario, the precursor type 2 quasars should be more gas-rich than their type 1 counterparts, and both types of quasars are expected to be gas-deficient relative to normal, star-forming galaxies of similar stellar mass. We test this evolutionary hypothesis by investigating the infr"},"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":"1902.02377","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-02-06T19:46:33Z","cross_cats_sorted":[],"title_canon_sha256":"f4d05e7da1af6064c1a8af6d757a2020735020901046d7a7583500dba8ff6c55","abstract_canon_sha256":"555b6b9332d776b59b6d1b198cda1406dac5773ad2d91d5adc6a1f5f238d576e"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:50:55.767189Z","signature_b64":"sD48enFyjR8TCAsYBRMatjfbrssGiTtiaquUv/0AwLW4cWcCNe9J9camePpn/EiX63ovRu/08ZXw+FdzcEzDDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"afb1d92addaa02d5a7f17c6d0f7e9f0ec7882d8231a5793fed92bb4d71b075a7","last_reissued_at":"2026-05-17T23:50:55.766499Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:50:55.766499Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Testing the Evolutionary Link between Type 1 and Type 2 Quasars with Measurements of the Interstellar Medium","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Jinyi Shangguan, Luis C. Ho","submitted_at":"2019-02-06T19:46:33Z","abstract_excerpt":"In a popular scenario for the coevolution of massive black holes and galaxies, major mergers of gas-rich galaxies fuel vigorous star formation and obscured (type 2) quasar activity until energy feedback from the active galactic nucleus clears away the gas and dust to reveal an unobscured (type 1) quasar. Under this scenario, the precursor type 2 quasars should be more gas-rich than their type 1 counterparts, and both types of quasars are expected to be gas-deficient relative to normal, star-forming galaxies of similar stellar mass. We test this evolutionary hypothesis by investigating the infr"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.02377","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1902.02377","created_at":"2026-05-17T23:50:55.766603+00:00"},{"alias_kind":"arxiv_version","alias_value":"1902.02377v1","created_at":"2026-05-17T23:50:55.766603+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1902.02377","created_at":"2026-05-17T23:50:55.766603+00:00"},{"alias_kind":"pith_short_12","alias_value":"V6Y5SKW5VIBN","created_at":"2026-05-18T12:33:30.264802+00:00"},{"alias_kind":"pith_short_16","alias_value":"V6Y5SKW5VIBNLJ7R","created_at":"2026-05-18T12:33:30.264802+00:00"},{"alias_kind":"pith_short_8","alias_value":"V6Y5SKW5","created_at":"2026-05-18T12:33:30.264802+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/V6Y5SKW5VIBNLJ7RPRWQ67U7B3","json":"https://pith.science/pith/V6Y5SKW5VIBNLJ7RPRWQ67U7B3.json","graph_json":"https://pith.science/api/pith-number/V6Y5SKW5VIBNLJ7RPRWQ67U7B3/graph.json","events_json":"https://pith.science/api/pith-number/V6Y5SKW5VIBNLJ7RPRWQ67U7B3/events.json","paper":"https://pith.science/paper/V6Y5SKW5"},"agent_actions":{"view_html":"https://pith.science/pith/V6Y5SKW5VIBNLJ7RPRWQ67U7B3","download_json":"https://pith.science/pith/V6Y5SKW5VIBNLJ7RPRWQ67U7B3.json","view_paper":"https://pith.science/paper/V6Y5SKW5","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1902.02377&json=true","fetch_graph":"https://pith.science/api/pith-number/V6Y5SKW5VIBNLJ7RPRWQ67U7B3/graph.json","fetch_events":"https://pith.science/api/pith-number/V6Y5SKW5VIBNLJ7RPRWQ67U7B3/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/V6Y5SKW5VIBNLJ7RPRWQ67U7B3/action/timestamp_anchor","attest_storage":"https://pith.science/pith/V6Y5SKW5VIBNLJ7RPRWQ67U7B3/action/storage_attestation","attest_author":"https://pith.science/pith/V6Y5SKW5VIBNLJ7RPRWQ67U7B3/action/author_attestation","sign_citation":"https://pith.science/pith/V6Y5SKW5VIBNLJ7RPRWQ67U7B3/action/citation_signature","submit_replication":"https://pith.science/pith/V6Y5SKW5VIBNLJ7RPRWQ67U7B3/action/replication_record"}},"created_at":"2026-05-17T23:50:55.766603+00:00","updated_at":"2026-05-17T23:50:55.766603+00:00"}