Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-03-28
Astronomy and Astrophysics
Astrophysics
Accepted for publication in the Astrophysical Journal
Scientific paper
10.1086/588628
The contribution of the Unresolved Extragalactic Radio Sources to the diffuse brightness of the sky was evaluated using the source number - flux measurements available in literature. We first optimized the fitting function of the data based on number counts distribution. We then computed the brightness temperature at various frequencies from 151 MHz to 8440 MHz and derived its spectral dependence. As expected the frequency dependence can be described by a power law with a spectral index $\gamma \simeq -2.7$, in agreement with the flux emitted by the {\it steep spectrum} sources. The contribution of {\it flat spectrum} sources becomes relevant at frequencies above several GHz. Using the data available in literature we improved our knowledge of the brightness of the unresolved extragalactic radio sources. The results obtained have general validity and they can be used to disentangle the various contributions of the sky brightness and to evaluate the CMB temperature.
Boella Giuliano
Gervasi Massimo
Sironi Giorgio
Tartari Andria
Zannoni Mario
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