{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2009:ZKQXTM5TYY764X2AO2NOCXM4XD","short_pith_number":"pith:ZKQXTM5T","schema_version":"1.0","canonical_sha256":"caa179b3b3c63fee5f40769ae15d9cb8edc4b30244a042427b356c81da17a80e","source":{"kind":"arxiv","id":"0910.1603","version":1},"attestation_state":"computed","paper":{"title":"Emission and Absorption Properties of Low-Mass Type 2 Active Galaxies with XMM-Newton","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"A. J. Barth (UC-Irvine), C.E. Thornton (UC-Irvine), J. E. Greene (Princeton), L. C. Ho (Carnegie)","submitted_at":"2009-10-08T20:19:32Z","abstract_excerpt":"We present XMM-Newton observations of four low-redshift Seyfert galaxies selected to have low host luminosities (M_g>-20 mag) and small stellar velocity dispersions (sigma_star<45 km/s), which are among the smallest stellar velocity dispersions found in any active galaxies. These galaxies show weak or no broad optical emission lines and have likely black hole masses <10^6 M_sun. Three out of four objects were detected with >3sigma significance in ~25 ks exposures and two observations had high enough signal-to-noise ratios for rudimentary spectral analysis. We calculate hardness ratios (-0.43 t"},"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":"0910.1603","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-10-08T20:19:32Z","cross_cats_sorted":[],"title_canon_sha256":"dd39f31249b89dea425c584e86fe5e3f2638759f72329d6020ec7f5972295845","abstract_canon_sha256":"8238686a6426e96da7ffb879672a4e98d4d6bbf5702c5af3e25392365ae1dc9a"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:34:19.565736Z","signature_b64":"5DK/uo5aoBA+FbUfHk8GgpSDbU442paf/+7kyoPS7REbBDDeT/WR+H2bxJbkT6bfSsNERGYlVfaiudOiUlFhAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"caa179b3b3c63fee5f40769ae15d9cb8edc4b30244a042427b356c81da17a80e","last_reissued_at":"2026-05-18T02:34:19.565282Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:34:19.565282Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Emission and Absorption Properties of Low-Mass Type 2 Active Galaxies with XMM-Newton","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"A. J. Barth (UC-Irvine), C.E. Thornton (UC-Irvine), J. E. Greene (Princeton), L. C. Ho (Carnegie)","submitted_at":"2009-10-08T20:19:32Z","abstract_excerpt":"We present XMM-Newton observations of four low-redshift Seyfert galaxies selected to have low host luminosities (M_g>-20 mag) and small stellar velocity dispersions (sigma_star<45 km/s), which are among the smallest stellar velocity dispersions found in any active galaxies. These galaxies show weak or no broad optical emission lines and have likely black hole masses <10^6 M_sun. Three out of four objects were detected with >3sigma significance in ~25 ks exposures and two observations had high enough signal-to-noise ratios for rudimentary spectral analysis. We calculate hardness ratios (-0.43 t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0910.1603","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":"0910.1603","created_at":"2026-05-18T02:34:19.565352+00:00"},{"alias_kind":"arxiv_version","alias_value":"0910.1603v1","created_at":"2026-05-18T02:34:19.565352+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0910.1603","created_at":"2026-05-18T02:34:19.565352+00:00"},{"alias_kind":"pith_short_12","alias_value":"ZKQXTM5TYY76","created_at":"2026-05-18T12:26:02.257875+00:00"},{"alias_kind":"pith_short_16","alias_value":"ZKQXTM5TYY764X2A","created_at":"2026-05-18T12:26:02.257875+00:00"},{"alias_kind":"pith_short_8","alias_value":"ZKQXTM5T","created_at":"2026-05-18T12:26:02.257875+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/ZKQXTM5TYY764X2AO2NOCXM4XD","json":"https://pith.science/pith/ZKQXTM5TYY764X2AO2NOCXM4XD.json","graph_json":"https://pith.science/api/pith-number/ZKQXTM5TYY764X2AO2NOCXM4XD/graph.json","events_json":"https://pith.science/api/pith-number/ZKQXTM5TYY764X2AO2NOCXM4XD/events.json","paper":"https://pith.science/paper/ZKQXTM5T"},"agent_actions":{"view_html":"https://pith.science/pith/ZKQXTM5TYY764X2AO2NOCXM4XD","download_json":"https://pith.science/pith/ZKQXTM5TYY764X2AO2NOCXM4XD.json","view_paper":"https://pith.science/paper/ZKQXTM5T","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=0910.1603&json=true","fetch_graph":"https://pith.science/api/pith-number/ZKQXTM5TYY764X2AO2NOCXM4XD/graph.json","fetch_events":"https://pith.science/api/pith-number/ZKQXTM5TYY764X2AO2NOCXM4XD/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/ZKQXTM5TYY764X2AO2NOCXM4XD/action/timestamp_anchor","attest_storage":"https://pith.science/pith/ZKQXTM5TYY764X2AO2NOCXM4XD/action/storage_attestation","attest_author":"https://pith.science/pith/ZKQXTM5TYY764X2AO2NOCXM4XD/action/author_attestation","sign_citation":"https://pith.science/pith/ZKQXTM5TYY764X2AO2NOCXM4XD/action/citation_signature","submit_replication":"https://pith.science/pith/ZKQXTM5TYY764X2AO2NOCXM4XD/action/replication_record"}},"created_at":"2026-05-18T02:34:19.565352+00:00","updated_at":"2026-05-18T02:34:19.565352+00:00"}