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We study a sample of 883 sources detected in a deep Very Large Array surveyat 1.4 GHz in the Extended Chandra Deep Field South. The paper focuses on theidentification of their optical and infrared (IR) counterparts. We use alikelihood ratio technique that is particularly useful when dealing with deepoptical images to minimize the number of spurious associations. We find areliable counterpart for 95% of our radio sources. Most of the counterparts(74%) are detected at optical wavelengths, but there is a significant fraction(21%) only detectable in the IR. Combining newly acquired optical spectra withdata from the literature we are able to assign a redshift to 81% of theidentified radio sources (37% spectroscopic). We also investigate the X-rayproperties of the radio sources using the Chandra 4 Ms and 250 ks observations.In particular, we use a stacking technique to derive the average properties ofradio objects undetected in the Chandra images. The results of our analysis arecollected in a new catalog containing the position of the optical/IRcounterpart, the redshift information and the X-ray fluxes. It is the deepestmulti-wavelength catalog of radio sources, which will be used for future studyof this galaxy population.

The sub-mJy radio population of the E-CDFS: optical and infrared counterpart identification