THE SUB-mJy RADIO POPULATION OF THE E-CDFS: OPTICAL AND INFRARED COUNTERPART IDENTIFICATION
- ESO, Karl-Schwarzschild-Strasse 2, D-85748 Garching (Germany)
- National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903-2475 (United States)
- Department of Astronomy, University of Maryland, College Park, MD 20742-2421 (United States)
- INAF Osservatorio Astronomico di Trieste, via G.B. Tiepolo 11, I-34131, Trieste (Italy)
- Dipartimento di Fisica Universit di Trieste, piazzale Europa 1, I-34127 Trieste (Italy)
- Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802 (United States)
We study a sample of 883 sources detected in a deep Very Large Array survey at 1.4 GHz in the Extended Chandra Deep Field South. This paper focuses on the identification of their optical and infrared (IR) counterparts. We use a likelihood-ratio technique that is particularly useful when dealing with deep optical images to minimize the number of spurious associations. We find a reliable counterpart for 95% of our radio sources. Most of the counterparts (74%) are detected at optical wavelengths, but there is a significant fraction (21%) that are only detectable in the IR. Combining newly acquired optical spectra with data from the literature, we are able to assign a redshift to 81% of the identified radio sources (37% spectroscopic). We also investigate the X-ray properties 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 of radio objects undetected in the Chandra images. The results of our analysis are collected in a new catalog containing the position of the optical/IR counterpart, the redshift information, and the X-ray fluxes. It is the deepest multi-wavelength catalog of radio sources, which will be used for future study of this galaxy population.
- OSTI ID:
- 22089788
- Journal Information:
- Astrophysical Journal, Supplement Series, Vol. 203, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0067-0049
- Country of Publication:
- United States
- Language:
- English
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