Source Counts
978-613-4-78252-4
6134782521
72
2011-01-13
29.00 €
eng
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The source counts distribution of radio-sources from a radio-astronomical survey is the cumulative distribution of the number of sources (N) brighter than a given flux density (S). It is one out of a half-dozen cosmological tests that was conceived in the 1930s to check the viability of and compare new cosmological models. Early work on cataloguing radio sources had as an aim the determination of the source counts distribution to help ia decide between cosmological models. For a uniform distribution of radio sources at not too large redshift (ie in a 'steady-state, Euclidean universe') the slope of the cumulative distribution of log(N) versus log(S) would be −1.5. Data from the early Cambridge 2C survey (published 1955) apparently implied a (log(N), log(S)) slope of nearly −3.0. This appeared to invalidate the steady state theory of Fred Hoyle, Hermann Bondi and Thomas Gold. Unfortunately many of these weaker sources were subsequently found to be due to 'confusion' (the blending of several weak sources in the side-lobes of the interferometer, to give a response like one stronger one).
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