{"paper":{"title":"First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Preliminary Maps and Basic Results","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"(2) UBC, (3) Princeton, 4), (4) NRC, (5) U. Chicago, (6) Brown, (7) UCLA, (8) SSAI), A. Kogut (1), C. Barnes (3), C. L. Bennett (1), D. N. Spergel (3), E. Komatsu (3), E. L. Wright (7), E. Wollack (1), G. Hinshaw (1), G. S. Tucker (6), H. V. Peirs (3), J. L. Weiland (8) ((1) NASA's GSFC, L. Page (3), L. Verde (3), M. Halpern (2), M. Limon (1, M. R. Greason (8), M. R. Nolta (3), N. Jarosik (3), N. Odegard (8), R. S. Hill (8), S. S. Meyer (5)","submitted_at":"2003-02-11T20:46:25Z","abstract_excerpt":"We present full sky microwave maps in five bands (23 to 94 GHz) from the WMAP first year sky survey. Calibration errors are <0.5% and the low systematic error level is well specified. The 2<l<900 anisotropy power spectrum is cosmic variance limited for l<354 with a signal-to-noise ratio >1 per mode to l=658. The temperature-polarization cross-power spectrum reveals both acoustic features and a large angle correlation from reionization. The optical depth of reionization is 0.17 +/- 0.04, which implies a reionization epoch of 180+220-80 Myr (95% CL) after the Big Bang at a redshift of 20+10-9 (9"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0302207","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/astro-ph/0302207/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"}