we have extended the simulation database to aid the interpretation of [*Herschel*]{} surveys. Such comparisons may also facilitate further model refinement and revised predictions for the [*Square Kilometer Array*]{} and its precursors.
author:
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title: 'An infrared–radio simulation of the extragalactic sky: from the Square Kilometer Array to Herschel'
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galaxies:evolution – galaxies:active – galaxies:starburst – cosmology:observations – infrared:galaxies – radio continuum:galaxies

INTRODUCTION
============

In Wilman et al. (2008) (hereafter W08) we presented a semi-empirical simulation of the extragalactic radio continuum sky primarily intended to aid the design of scientific programmes for the next generation of radio telescope facilities, culminating in the [*Square Kilometer Array*]{} (SKA). The simulation covers a sky area of $20 \times 20$ deg$^{2}$ and contains radio-loud and radio-quiet active galactic nuclei (AGN) and star-forming galaxies out to redshift $z=20$ within a framework for their large-scale clustering. The full source catalogue – containing 320 million sources above 10 nJy at five frequencies ranging from 151 MHz to 18 GHz – can be accessed at the SKADS Simulated Skies ($S^{3}$) database[^1] under $S^{3}$–SEX (semi-empirical extragalactic simulation).

There are by 