{"paper":{"title":"The Atacama Cosmology Telescope: Measurement and Analysis of 1D Beams for DR4","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.IM","authors_text":"Adam D. Hincks, Adriaan J. Duivenvoorden, Alessandro Schillaci, Bruce Partridge, Crist\\'obal Sif\\'on, Dhaneshwar D. Sunder, Edward J. Wollack, Emilie R. Storer, Erminia Calabrese, Federico Nati, Grace E. Chesmore, J. Colin Hill, Jeff McMahon, Jo Dunkley, Johannes Hubmayr, Joseph E. Golec, Kavilan Moodley, Lyman A. Page, Marius Lungu, Mathew S. Madhavacheril, Matthew Hasselfield, Maya Mallaby-Kay, Michael D. Niemack, Patricio A. Gallardo, Roberto Puddu, Rolando D\\\"unner, Sigurd Naess, Steve K. Choi, Suzanne Staggs, Yilun Guan, Zhilei Xu","submitted_at":"2021-12-22T21:10:04Z","abstract_excerpt":"We describe the measurement and treatment of the telescope beams for the Atacama Cosmology Telescope's fourth data release, DR4. Observations of Uranus are used to measure the central portion (<12') of the beams to roughly -40 dB of the peak. Such planet maps in intensity are used to construct azimuthally averaged beam profiles, which are fit with a physically motivated model before being transformed into Fourier space. We investigate and quantify a number of percent-level corrections to the beams, all of which are important for precision cosmology. Uranus maps in polarization are used to meas"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2112.12226","kind":"arxiv","version":2},"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/2112.12226/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"}