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The hard X-ray spectrum can be described by a model composed of an absorbed power-law with Gamma= 2.5^{+0.4}_{-0.3}, and column density N_H=1.9^{+0.1}_{-0.2} times 10^{22} atoms cm^{-2}. The absorption corrected luminosity of the source is L(0.2 - 10.0 keV) = 2.5 times 10^{41} ergs s^{-1}, with bolometric luminosity over 3 \\times 10^{42} ergs s^{-1}. Based on the spectrum and the luminosity, we identify the nuclear X-ray source in NGC 4561 to be an AGN, with a black hole of mass M_BH > 20,000 solar mas"},"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":"1209.1354","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-09-06T17:58:44Z","cross_cats_sorted":[],"title_canon_sha256":"6c1968db72150ff7c975c02158754eed772b789b5a46e3ed1211a13f52ed4848","abstract_canon_sha256":"e15db9a55b985c178953b76079db2e4bb0bbdc7496acafd47747f37c24438095"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:54:39.183788Z","signature_b64":"YLU1LUoUfL+XJAq69aBr/x08tq3jSRBcyEB3esMVJVu6BuTRTbqgY6oxlePG1TnhhhorPE7G3SeNZomgjBmcAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3220123a86e7c8814ebff0c6e135b72123360a1582c8a5cf1ec14717c41a8c54","last_reissued_at":"2026-05-18T01:54:39.183123Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:54:39.183123Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Discovery of an active supermassive black hole in the bulge-less galaxy NGC 4561","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"C.Araya Salvo, F. Fiore, H. Ghosh, L. Ferrarese, S. Mathur","submitted_at":"2012-09-06T17:58:44Z","abstract_excerpt":"We present XMM-Newton observations of the Chandra-detected nuclear X-ray source in NGC 4561. The hard X-ray spectrum can be described by a model composed of an absorbed power-law with Gamma= 2.5^{+0.4}_{-0.3}, and column density N_H=1.9^{+0.1}_{-0.2} times 10^{22} atoms cm^{-2}. The absorption corrected luminosity of the source is L(0.2 - 10.0 keV) = 2.5 times 10^{41} ergs s^{-1}, with bolometric luminosity over 3 \\times 10^{42} ergs s^{-1}. 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