{"paper":{"title":"The XMM large scale structure survey: optical vs. X-ray classifications of active galactic nuclei and the unified scheme","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. Corral, A. Schwope, C. Lonsdale, D. Maccagni, E. Gosset, F. J. Carrera, F. Pacaud, I. Gavignaud, J. A. Tedds, J. Ebrero, J. Surdej, L. Chiappetti, M. J. Page, M. Krumpe, M. Pierre, M. Polletta, M. Tajer, M. Watson, O. Garcet, O. Le Fevre, P. Gandhi, P. G. Sprimont, P. Vaisanen, S. Mateos, S. Rosen, T. Contini, V. Borkowski, W. Borczyk","submitted_at":"2007-09-13T14:07:52Z","abstract_excerpt":"Our goal is to characterize AGN populations by comparing their X-ray and optical classifications. We present a sample of 99 spectroscopically identified X-ray point sources in the XMM-LSS survey which are significantly detected in the [2-10] keV band, and with more than 80 counts. We performed an X-ray spectral analysis for all of these 99 X-ray sources. Introducing the fourfold point correlation coefficient, we find only a mild correlation between the X-ray and the optical classifications, as up to 30% of the sources have differing X-ray and optical classifications: on one hand, 10% of the ty"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0709.2077","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"}