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J/ApJS/203/15 Counterparts to 1.4GHz sources in ECDF-S (Bonzini+, 2012)
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Beginning of ReadMe :J/ApJS/203/15 Counterparts to 1.4GHz sources in ECDF-S (Bonzini+, 2012)
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The sub-mJy radio population of the E-CDFS: optical and infrared counterpart
identification.
Bonzini M., Mainieri V., Padovani P., Kellermann K.I., Miller N.,
Rosati P., Tozzi P., Vattakunnel S., Balestra I., Brandt W.N., Luo B.,
Xue Y.Q.
<Astrophys. J. Suppl. Ser., 203, 15 (2012)>
=2012ApJS..203...15B
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ADC_Keywords: Radio sources ; Cross identifications ; X-ray sources ;
Redshifts ; Surveys ; Photometry, infrared ; Photometry, RI
Keywords: cosmology: observations - galaxies: active - galaxies: starburst -
radio continuum: galaxies
Abstract:
We study a sample of 883 sources detected in a deep Very Large Array
survey at 1.4GHz 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 4Ms and
250ks 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.
Description:
The E-CDFS was observed at 1.4GHz with the VLA between 2007 June and
September (Miller et al. 2008, Cat. J/ApJS/179/114). The mosaic image
covers an area of about 34x34arcmin with near-uniform sensitivity. The
second data release (N. Miller et al. 2012, in preparation) provides a
new source catalog with a 5sigma point-source detection limit, for a
total of 883 sources. We assigned a progressive identification number
(RID) to the sources ordered by increasing right ascension.