Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-09-04
New Astron.Rev. 48 (2004) 1173-1185
Astronomy and Astrophysics
Astrophysics
14 pages, 6 figures. To appear in "Science with the Square Kilometer Array," eds. C. Carilli and S. Rawlings, New Astronomy Re
Scientific paper
10.1016/j.newar.2004.09.006
In this paper we investigate how the Square Kilometre Array (SKA) can aid in determining the evolutionary history of active galactic nuclei (AGN) from redshifts z= 0 ->6. Given the vast collecting area of the SKA, it will be sensitive to both `radio-loud' AGN and the much more abundant `radio-quiet' AGN, namely the radio-quiet quasars and their `Type-II' counterparts, out to the highest redshifts. Not only will the SKA detect these sources but it will also often be able to measure their redshifts via the Hydrogen 21 cm line in emission and/or absorption. We construct a complete radio luminosity function (RLF) for AGN, combining the most recent determinations for powerful radio sources with an estimate of the RLF for radio-quiet objects using the hard X-ray luminosity function of Ueda et al., including both Type-I and Type-II AGN. We use this complete RLF to determine the optimal design of the SKA for investigating the accretion history of the Universe for which it is likely to be a uniquely powerful instrument.
Jarvis Matt J.
Rawlings Steve
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