Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-04-12
Astronomy and Astrophysics
Astrophysics
To appear in "After the Dark Ages: When Galaxies Were Young (the Universe at 2 < z < 5)", University of Maryland, October 1998
Scientific paper
10.1063/1.58647
The results of an optical and infrared investigation of a complete sub-sample of the Leiden-Berkeley Deep Survey (flux > 1 mJy at 1.4 GHz) are presented. Optical counterparts have been identified for 69 of the 73 sources in the two Hercules fields, and redshifts obtained for 49 of them. Photometric redshifts are computed from the g,r,i,K data for the remaining 21 sources. This complete sample is compared with the radio luminosity functions (RLFs) of Dunlop and Peacock (1990). The RLF models successfully trace the evolution of the radio sources with redshift, but there is some disagreement between the luminosity-dependence of the models and the data. The observed RLF for the lower luminosity population (log P < 26) shows evidence for a cut-off at lower redshifts (z=0.5-1.5) than for the more powerful objects.
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