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Title: THE SUB-mJy RADIO POPULATION OF THE E-CDFS: OPTICAL AND INFRARED COUNTERPART IDENTIFICATION

Abstract

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 futuremore » study of this galaxy population.« less

Authors:
; ; ;  [1];  [2];  [3]; ;  [4];  [5]; ;  [6];  [7]
  1. ESO, Karl-Schwarzschild-Strasse 2, D-85748 Garching (Germany)
  2. National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903-2475 (United States)
  3. Department of Astronomy, University of Maryland, College Park, MD 20742-2421 (United States)
  4. INAF Osservatorio Astronomico di Trieste, via G.B. Tiepolo 11, I-34131, Trieste (Italy)
  5. Dipartimento di Fisica Universit di Trieste, piazzale Europa 1, I-34127 Trieste (Italy)
  6. Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802 (United States)
  7. Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Chinese Academy of Sciences, Hefei, Anhui 230026 (China)
Publication Date:
OSTI Identifier:
22089788
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal, Supplement Series
Additional Journal Information:
Journal Volume: 203; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0067-0049
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; CATALOGS; COSMIC RADIO SOURCES; COSMOLOGY; GALAXIES; GHZ RANGE; IMAGES; INFRARED RADIATION; RADIOASTRONOMY; RED SHIFT; VISIBLE RADIATION; WAVELENGTHS

Citation Formats

Bonzini, M., Mainieri, V., Padovani, P., Rosati, P., Kellermann, K. I., Miller, N., Tozzi, P., Balestra, I., Vattakunnel, S., Brandt, W. N., Luo, B., and Xue, Y. Q., E-mail: mbonzini@eso.org. THE SUB-mJy RADIO POPULATION OF THE E-CDFS: OPTICAL AND INFRARED COUNTERPART IDENTIFICATION. United States: N. p., 2012. Web. doi:10.1088/0067-0049/203/1/15.
Bonzini, M., Mainieri, V., Padovani, P., Rosati, P., Kellermann, K. I., Miller, N., Tozzi, P., Balestra, I., Vattakunnel, S., Brandt, W. N., Luo, B., & Xue, Y. Q., E-mail: mbonzini@eso.org. THE SUB-mJy RADIO POPULATION OF THE E-CDFS: OPTICAL AND INFRARED COUNTERPART IDENTIFICATION. United States. doi:10.1088/0067-0049/203/1/15.
Bonzini, M., Mainieri, V., Padovani, P., Rosati, P., Kellermann, K. I., Miller, N., Tozzi, P., Balestra, I., Vattakunnel, S., Brandt, W. N., Luo, B., and Xue, Y. Q., E-mail: mbonzini@eso.org. Thu . "THE SUB-mJy RADIO POPULATION OF THE E-CDFS: OPTICAL AND INFRARED COUNTERPART IDENTIFICATION". United States. doi:10.1088/0067-0049/203/1/15.
@article{osti_22089788,
title = {THE SUB-mJy RADIO POPULATION OF THE E-CDFS: OPTICAL AND INFRARED COUNTERPART IDENTIFICATION},
author = {Bonzini, M. and Mainieri, V. and Padovani, P. and Rosati, P. and Kellermann, K. I. and Miller, N. and Tozzi, P. and Balestra, I. and Vattakunnel, S. and Brandt, W. N. and Luo, B. and Xue, Y. Q., E-mail: mbonzini@eso.org},
abstractNote = {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.},
doi = {10.1088/0067-0049/203/1/15},
journal = {Astrophysical Journal, Supplement Series},
issn = {0067-0049},
number = 1,
volume = 203,
place = {United States},
year = {2012},
month = {11}
}