{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2004:PE2POKOHLC2J3HCGBSUA32GAMN","short_pith_number":"pith:PE2POKOH","schema_version":"1.0","canonical_sha256":"7934f729c758b49d9c460ca80de8c06360dd90fb58533914e68c2f482e29481e","source":{"kind":"arxiv","id":"astro-ph/0405358","version":1},"attestation_state":"computed","paper":{"title":"Chandra's Discovery of Activity in the Quiescent Nuclear Black Hole of NGC 821","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. Baldi, A. Siemiginowska, A. Zezas, G. Fabbiano, J. McDowell, M. Elvis, S. Pellegrini","submitted_at":"2004-05-18T21:14:25Z","abstract_excerpt":"We report the results of the {\\it Chandra} ACIS-S observations of the elliptical galaxy NGC 821, which harbors a supermassive nuclear black hole (of $3.5 \\times 10^7 M_{\\odot}$), but does not show sign of AGN activity. A small, 8.5$^{\\prime\\prime}$ long ($\\sim 1$ kpc at the galaxy's distance of 23 Mpc), S-shaped, jet-like feature centered on the nucleus is detected in the 38 ksec ACIS-S integrated exposure of this region. The luminosity of this feature is $L_X \\sim 2.6 \\times 10^{39} \\rm ergs s^{-1}$ (0.3-10 keV), and its spectrum is hard (described by a power-law of $\\Gamma = 1.8^{+0.7}_{-0.6"},"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":"astro-ph/0405358","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2004-05-18T21:14:25Z","cross_cats_sorted":[],"title_canon_sha256":"a31b9eace698c862fb3be01b167f50a8767918b4ec6e545e27212bb8504bfb85","abstract_canon_sha256":"cb4f2b76445596b7c9a67c94a5fa5f5873330eba05151a0b60be48f72fe78dcc"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:40:37.031607Z","signature_b64":"N/9+EhvUQHOeHbpon8DEqo+ypy3ZT8gDTk1oavJ2q5sIPoQ4SDvS7DlDq0UfljcIn22EH3GJ5fkeGF2a+55uDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7934f729c758b49d9c460ca80de8c06360dd90fb58533914e68c2f482e29481e","last_reissued_at":"2026-05-18T01:40:37.030823Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:40:37.030823Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Chandra's Discovery of Activity in the Quiescent Nuclear Black Hole of NGC 821","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. Baldi, A. Siemiginowska, A. Zezas, G. Fabbiano, J. McDowell, M. Elvis, S. Pellegrini","submitted_at":"2004-05-18T21:14:25Z","abstract_excerpt":"We report the results of the {\\it Chandra} ACIS-S observations of the elliptical galaxy NGC 821, which harbors a supermassive nuclear black hole (of $3.5 \\times 10^7 M_{\\odot}$), but does not show sign of AGN activity. A small, 8.5$^{\\prime\\prime}$ long ($\\sim 1$ kpc at the galaxy's distance of 23 Mpc), S-shaped, jet-like feature centered on the nucleus is detected in the 38 ksec ACIS-S integrated exposure of this region. The luminosity of this feature is $L_X \\sim 2.6 \\times 10^{39} \\rm ergs s^{-1}$ (0.3-10 keV), and its spectrum is hard (described by a power-law of $\\Gamma = 1.8^{+0.7}_{-0.6"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0405358","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":"astro-ph/0405358","created_at":"2026-05-18T01:40:37.030948+00:00"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0405358v1","created_at":"2026-05-18T01:40:37.030948+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0405358","created_at":"2026-05-18T01:40:37.030948+00:00"},{"alias_kind":"pith_short_12","alias_value":"PE2POKOHLC2J","created_at":"2026-05-18T12:25:52.687210+00:00"},{"alias_kind":"pith_short_16","alias_value":"PE2POKOHLC2J3HCG","created_at":"2026-05-18T12:25:52.687210+00:00"},{"alias_kind":"pith_short_8","alias_value":"PE2POKOH","created_at":"2026-05-18T12:25:52.687210+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/PE2POKOHLC2J3HCGBSUA32GAMN","json":"https://pith.science/pith/PE2POKOHLC2J3HCGBSUA32GAMN.json","graph_json":"https://pith.science/api/pith-number/PE2POKOHLC2J3HCGBSUA32GAMN/graph.json","events_json":"https://pith.science/api/pith-number/PE2POKOHLC2J3HCGBSUA32GAMN/events.json","paper":"https://pith.science/paper/PE2POKOH"},"agent_actions":{"view_html":"https://pith.science/pith/PE2POKOHLC2J3HCGBSUA32GAMN","download_json":"https://pith.science/pith/PE2POKOHLC2J3HCGBSUA32GAMN.json","view_paper":"https://pith.science/paper/PE2POKOH","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=astro-ph/0405358&json=true","fetch_graph":"https://pith.science/api/pith-number/PE2POKOHLC2J3HCGBSUA32GAMN/graph.json","fetch_events":"https://pith.science/api/pith-number/PE2POKOHLC2J3HCGBSUA32GAMN/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/PE2POKOHLC2J3HCGBSUA32GAMN/action/timestamp_anchor","attest_storage":"https://pith.science/pith/PE2POKOHLC2J3HCGBSUA32GAMN/action/storage_attestation","attest_author":"https://pith.science/pith/PE2POKOHLC2J3HCGBSUA32GAMN/action/author_attestation","sign_citation":"https://pith.science/pith/PE2POKOHLC2J3HCGBSUA32GAMN/action/citation_signature","submit_replication":"https://pith.science/pith/PE2POKOHLC2J3HCGBSUA32GAMN/action/replication_record"}},"created_at":"2026-05-18T01:40:37.030948+00:00","updated_at":"2026-05-18T01:40:37.030948+00:00"}