Deep ATLAS radio observations of the CDFS-SWIRE field

TL;DR

This paper reports deep radio observations of the CDFS-SWIRE field, identifying numerous sources including rare infrared-faint radio sources, and cross-matching with multi-wavelength data to study galaxy populations.

Contribution

First deep radio survey of the CDFS-SWIRE field with extensive multi-wavelength cross-identifications and discovery of rare infrared-faint radio sources.

Findings

784 radio components identified, 726 sources cross-matched with SWIRE

Most sources at redshift 0.5-2 include star-forming galaxies and AGN

Discovery of rare infrared-faint radio sources

Abstract

We present the first results from the Australia Telescope Large Area Survey (ATLAS), which consist of deep radio observations of a 3.7 square degree field surrounding the Chandra Deep Field South, largely coincident with the infrared Spitzer Wide-Area Extragalactic (SWIRE) Survey. We also list cross-identifications to infrared and optical photometry data from SWIRE, and ground-based optical spectroscopy. A total of 784 radio components are identified, corresponding to 726 distinct radio sources, nearly all of which are identified with SWIRE sources. Of the radio sources with measured redshifts, most lie in the redshift range 0.5-2, and include both star-forming galaxies and active galactic nuclei (AGN). We identify a rare population of infrared-faint radio sources which are bright at radio wavelengths but are not seen in the available optical, infrared, or X-ray data. Such rare classes of sources can only be discovered in wide, deep surveys such as this.