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Lunar occultation of the diffuse radio sky: LOFAR measurements between 35 and 80 MHz

Koopmans, L. V. E.; de Bruyn, A.G.; Wijnholds, S J; Bernardi, G; Ciardi, Benedetta; Ghosh, A.; Offringa, Andre; Yatawatta, S; Asgekar, A; Bentum, M J; Bonafede, A; Breitling, F; de Gasperin, F; de Geus, Eugene; Duscha, S; Engels, Dieter; Fallows, R A; Frieswijk, W; Garrett, M A; Gunst, A W; Heald, G; Hoeft, M; Iacobelli, M.; Kondratiev, V. I.; Kuniyoshi, M; Kuper, G.; McKean, J P; Mulcahy, D.D.; Munk, H; Norden, M J; Pizzo, R; Polatidis, A.G.; Reich, W; Shulevski, Alexander; Tang, Y; Toribio, C.; Vocks, Christian; Wise, M J; Butcher, Harvey

Description

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 < ν < 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...[Show more]

CollectionsANU Research Publications
Date published: 2015
Type: Journal article
URI: http://hdl.handle.net/1885/70617
Source: Monthly Notices of the Royal Astronomical Society
DOI: 10.1093/mnras/stv746

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