{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2012:K5Q2XSL43NNWHO6ADK42D3LEQE","short_pith_number":"pith:K5Q2XSL4","schema_version":"1.0","canonical_sha256":"5761abc97cdb5b63bbc01ab9a1ed64812cd9b21365ce540bc9d9110c2c7e6197","source":{"kind":"arxiv","id":"1204.1977","version":1},"attestation_state":"computed","paper":{"title":"The 4 Ms Chandra Deep Field-South Number Counts Apportioned by Source Class: Pervasive Active Galactic Nuclei and the Ascent of Normal Galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"A. Comastri, A.E. Hornschemeier, A. Ptak, B.D. Lehmer, B. Luo, C. Vignali, D.M. Alexander, D.P. Schneider, F.E. Bauer, M. Brusa, M. Paolillo, O. Shemmer, P. Tozzi, R. Gilli, W.N. Brandt, Y.Q. Xue","submitted_at":"2012-04-09T20:00:05Z","abstract_excerpt":"We present 0.5-2 keV, 2-8 keV, 4-8 keV, and 0.5-8 keV cumulative and differential number counts (logN-logS) measurements for the recently completed ~4 Ms Chandra Deep Field-South (CDF-S) survey, the deepest X-ray survey to date. We implement a new Bayesian approach, which allows reliable calculation of number counts down to flux limits that are factors of ~1.9-4.3 times fainter than the previously deepest number-counts investigations. In the soft band, the most sensitive bandpass in our analysis, the ~4 Ms CDF-S reaches a maximum source density of ~27,800 deg-2. By virtue of the exquisite X-ra"},"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":"1204.1977","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-04-09T20:00:05Z","cross_cats_sorted":[],"title_canon_sha256":"415bee492bfcd82622faa8b08fa9d6ffcd1bd8f69816a4df39630a274757a2ea","abstract_canon_sha256":"b474502b6a65a357633c31e93328f12b367cb68369a1897b3da0c40f40fbe2fa"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:57:55.611326Z","signature_b64":"APclgfot2J8KM+yy87eWauv58C/ueAzDbgclnIbdAzWo2AaJeKY3Le40KP0gcISLRlD71n4aypkHc8lucYm5Cw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5761abc97cdb5b63bbc01ab9a1ed64812cd9b21365ce540bc9d9110c2c7e6197","last_reissued_at":"2026-05-18T01:57:55.610921Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:57:55.610921Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The 4 Ms Chandra Deep Field-South Number Counts Apportioned by Source Class: Pervasive Active Galactic Nuclei and the Ascent of Normal Galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"A. Comastri, A.E. Hornschemeier, A. Ptak, B.D. Lehmer, B. Luo, C. Vignali, D.M. Alexander, D.P. Schneider, F.E. Bauer, M. Brusa, M. Paolillo, O. Shemmer, P. Tozzi, R. Gilli, W.N. Brandt, Y.Q. Xue","submitted_at":"2012-04-09T20:00:05Z","abstract_excerpt":"We present 0.5-2 keV, 2-8 keV, 4-8 keV, and 0.5-8 keV cumulative and differential number counts (logN-logS) measurements for the recently completed ~4 Ms Chandra Deep Field-South (CDF-S) survey, the deepest X-ray survey to date. We implement a new Bayesian approach, which allows reliable calculation of number counts down to flux limits that are factors of ~1.9-4.3 times fainter than the previously deepest number-counts investigations. In the soft band, the most sensitive bandpass in our analysis, the ~4 Ms CDF-S reaches a maximum source density of ~27,800 deg-2. By virtue of the exquisite X-ra"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1204.1977","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":"1204.1977","created_at":"2026-05-18T01:57:55.610980+00:00"},{"alias_kind":"arxiv_version","alias_value":"1204.1977v1","created_at":"2026-05-18T01:57:55.610980+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1204.1977","created_at":"2026-05-18T01:57:55.610980+00:00"},{"alias_kind":"pith_short_12","alias_value":"K5Q2XSL43NNW","created_at":"2026-05-18T12:27:11.947152+00:00"},{"alias_kind":"pith_short_16","alias_value":"K5Q2XSL43NNWHO6A","created_at":"2026-05-18T12:27:11.947152+00:00"},{"alias_kind":"pith_short_8","alias_value":"K5Q2XSL4","created_at":"2026-05-18T12:27:11.947152+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/K5Q2XSL43NNWHO6ADK42D3LEQE","json":"https://pith.science/pith/K5Q2XSL43NNWHO6ADK42D3LEQE.json","graph_json":"https://pith.science/api/pith-number/K5Q2XSL43NNWHO6ADK42D3LEQE/graph.json","events_json":"https://pith.science/api/pith-number/K5Q2XSL43NNWHO6ADK42D3LEQE/events.json","paper":"https://pith.science/paper/K5Q2XSL4"},"agent_actions":{"view_html":"https://pith.science/pith/K5Q2XSL43NNWHO6ADK42D3LEQE","download_json":"https://pith.science/pith/K5Q2XSL43NNWHO6ADK42D3LEQE.json","view_paper":"https://pith.science/paper/K5Q2XSL4","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1204.1977&json=true","fetch_graph":"https://pith.science/api/pith-number/K5Q2XSL43NNWHO6ADK42D3LEQE/graph.json","fetch_events":"https://pith.science/api/pith-number/K5Q2XSL43NNWHO6ADK42D3LEQE/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/K5Q2XSL43NNWHO6ADK42D3LEQE/action/timestamp_anchor","attest_storage":"https://pith.science/pith/K5Q2XSL43NNWHO6ADK42D3LEQE/action/storage_attestation","attest_author":"https://pith.science/pith/K5Q2XSL43NNWHO6ADK42D3LEQE/action/author_attestation","sign_citation":"https://pith.science/pith/K5Q2XSL43NNWHO6ADK42D3LEQE/action/citation_signature","submit_replication":"https://pith.science/pith/K5Q2XSL43NNWHO6ADK42D3LEQE/action/replication_record"}},"created_at":"2026-05-18T01:57:55.610980+00:00","updated_at":"2026-05-18T01:57:55.610980+00:00"}