{"paper":{"title":"Upper limits on the 21-cm Epoch of Reionization power spectrum from one night with LOFAR","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM"],"primary_cat":"astro-ph.CO","authors_text":"A.G. de Bruyn, A. Ghosh, A.H. Patil, A. R. Offringa, B. Ciardi, B. K. Gehlot, D. Vrbanec, E. Chapman, F. B. Abdalla, G. Harker, G. Mellema, H. Vedantham, I. T. Iliev, J. Schaye, K. Kakiichi, K. M. B. Asad, L.V.E. Koopmans, M. A. Brentjens, M. B. Silva, M. Hatef, M. Mevius, S. J. Wijnholds, S. Majumdar, S. Yatawatta, S. Zaroubi, V. Jelic, V.N. Pandey, W. N. Brouw","submitted_at":"2017-02-28T07:54:18Z","abstract_excerpt":"We present the first limits on the Epoch of Reionization (EoR) 21-cm HI power spectra, in the redshift range $z=7.9-10.6$, using the Low-Frequency Array (LOFAR) High-Band Antenna (HBA). In total 13\\,h of data were used from observations centred on the North Celestial Pole (NCP). After subtraction of the sky model and the noise bias, we detect a non-zero $\\Delta^2_{\\rm I} = (56 \\pm 13 {\\rm mK})^2$ (1-$\\sigma$) excess variance and a best 2-$\\sigma$ upper limit of $\\Delta^2_{\\rm 21} < (79.6 {\\rm mK})^2$ at $k=0.053$$h$cMpc$^{-1}$ in the range $z=$9.6-10.6. The excess variance decreases when optim"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1702.08679","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"}