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Deep Radio Source Counts and Small Scale Fluctuations of the Microwave Background Radiation

Published online by Cambridge University Press:  04 August 2017

L. Danese ,
G. de Zotti  and
N. Mandolesi
L. Danese
Affiliation:
Istituto di Astronomia, Padova (Italy)
G. de Zotti
Affiliation:
Istituto di Astronomia, Padova (Italy)
N. Mandolesi
Affiliation:
Istituto TESRE/CNR, Bologna (Italy)

Extract

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Source counts which now extend to surface densities of ∼105 sources/sr make possible a direct evaluation of the radio source contribution to the small-scale fluctuations in the microwave background on scales larger than ∼10′, at wavelengths cm. Comprehensive radio spectral data permit a straightforward and largely model-independent extrapolation of the N(S) relation to shorter wavelengths. On the other hand, Peacock and Gull (1981, hereafter PG) have constructed a set of models which incorporate a wealth of additional data, such as local luminosity functions, luminosity/redshift distributions, luminosity-spectral index correlations; they can therefore be exploited to optimize the extrapolations both to higher frequencies and to fainter flux densities. Only one of these models, however, namely No. 4, is consistent with the recent P(D) results (Wall et al. 1982; Ledden et al. 1980) which provide information on the areal density of sources at s~1mJy; therefore, in the following we shall focus on it.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 104: Early Evolution of the Universe and Its Present Structure , 1983 , pp. 131 - 133
Copyright
Copyright © Reidel 1983 

References

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Wall, J.V., Scheuer, P.A.G., Pauliny-Toth, I.I.K., Witzel, A.: 1982, Monthly Notices Roy. Astron. Soc., 198, 221–237.Google Scholar