{"paper":{"title":"Lunar occultation of the diffuse radio sky: LOFAR measurements between 35 and 80 MHz","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.IM","authors_text":"A. Asgekar, A. Bonafede, A. Corstanje, A. Deller, A. G. de Bruyn, A. Ghosh, A. G. Polatidis, A. H. Patil, A. Nelles, A. Renting, A. R. Offringa, A. Shulevski, A. W. Gunst, B. Ciardi, B. W. Stappers, C. Ferrari, C. Tasse, C. Toribio, C. Vocks, D. D. Mulcahy, D. Engels, D. McKay-Bukowski, D. Schwarz, E. Chapman, E. de Geus, E. Juette, E. Orru, E. R. Fernandez, F. B. Abdalla, F. Breitling, F. De Gasperin, G. Bernardi, G. Harker, G. Heald, G. Kuper, G. Mann, G. Mellema, H. Falcke, H. Jensen, H. K. Vedantham, H. Munk, H. R. Butcher, H. R\\\"ottgering, J. Anderson, J. Broderick, J. Eisl\\\"offel, J. Grie{\\ss}meier, J. H\\\"orandel, J. Swinbank, K. M. B. Asad, L. V. E. Koopmans, M. A. Garrett, M. Brentjens, M. Br\\\"uggen, M. E. Bell, M. Hoeft, M. Iacobelli, M. J. Bentum, M. J. Norden, M. Kuniyoshi, M. Mevius, M. Pandey-Pommier, M. Steinmetz, M. Tagger, M. W. Wise, O. Martinez-Rubi, O. Smirnov, O. Wucknitz, P. Best, P. Lambropoulos, P. Zarka, R. A. Fallows, R. Fender, R. McFadden, R. M. Thomas, R. Pizzo, S. Bus, S. Daiboo, S. Duscha, S. J. Wijnholds, S. Kazemi, S. Markoff, S. ter Veen, S. Thoudam, S. Yatawatta, S. Zaroubi, T. E. Hassall, V. I. Kondratiev, V. Jelic, V. N. Pandey, V. Veligatla, W. Frieswijk, W. Reich, Y. Tang","submitted_at":"2014-07-16T09:55:03Z","abstract_excerpt":"We present radio observations of the Moon between $35$ and $80$ MHz to demonstrate a novel technique of interferometrically measuring large-scale diffuse emission extending far beyond the primary beam (global signal) for the first time. In particular, we show that (i) the Moon appears as a negative-flux source at frequencies $35<\\nu<80$ MHz since it is `colder' than the diffuse Galactic background it occults, (ii) using the (negative) flux of the lunar disc, we can reconstruct the spectrum of the diffuse Galactic emission with the lunar thermal emission as a reference, and (iii) that reflected"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.4244","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"}