Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-10-26
Nuovo Cim.B122:1029-1032,2007
Astronomy and Astrophysics
Astrophysics
4 pages, 2 figures, to appear in conference proceedings of 'A Century of Cosmology; Past, Present and Future', Venice 2007
Scientific paper
10.1393/ncb/i2008-10440-y
We study the 37 brightest radio sources in the Subaru/XMM-Newton Deep Field (SXDF). Using mid-IR (Spitzer MIPS 24 micron) data we expect to trace nuclear accretion activity, even if it is obscured at optical wavelengths, unless the obscuring column is extreme. Our results suggest that above the `FRI/FRII' radio luminosity break most of the radio sources are associated with objects that have excess mid-IR emission, only some of which are broad-line objects, although there is one clear low-accretion-rate FRI. The fraction of objects with mid-IR excess drops dramatically below the FRI/FRII break, although there exists at least one high-accretion-rate QSO. Investigation of mid-IR and blue excesses shows that they are correlated as predicted by a model in which a torus of dust absorbs ~30% of the light, and the dust above and below the torus scatters >~1% of the light.
Rawlings Steve
Simpson Chris
Vardoulaki Eleni
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