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ATLASCSCPT - AT Large Area Survey (ATLAS) CDF-S/SWIRE 1.4-GHz Components Catalog

HEASARC
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Overview

This table contains some of the first results from the Australia Telescope Large Area Survey (ATLAS), which consists of deep 1.4-GHz radio observations of a 3.7 deg2 field surrounding the Chandra Deep Field-South (CDF-S), largely coincident with the infrared Spitzer Wide-Area Infrared Extragalactic (SWIRE) Survey. A total of 784 radio components are identified, corresponding to 726 distinct radio sources, nearly all of which are identified with SWIRE sources in the companion table ATLASCSID. Of the radio sources with measured redshifts, most lie in the redshift range 0.5 to 2 and include both star-forming galaxies and active galactic nuclei. The authors identify a rare population of infrared-faint radio sources that 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.

The radio observations where made on 2002 Apr 4-27, Aug 24-29 and 2004 Jan 7-12, Feb 1-5, Jun 6-12 and Nov 24-30, with the Australia Telescope Compact Array (ATCA). The observations in 2002 were made in a mosaic of 7 overlapping fields, for a total of 149 hours of integration time, or 21.3 hours per pointing. The observations in 2004 were taken in the AT mosaic mode, in which the array was cycled around 21 pointing centers They total 173 hours of integration time, or 8.2 hours per pointing. All observations were made with two 128-MHz bands, centered on frequencies of 1344 and 1472 MHz.

This table contains the list of 784 radio components given in Table 4 of the reference paper. The authors define a radio 'component' as a region of radio emission identified in the source extraction process. They define a radio 'source' as one or more radio components that appear to be physically connected and that probably correspond to one galaxy. Thus, the authors count a classical triple radio-loud source as being a radio source consisting of three radio components, but count a pair of interacting starburst galaxies as being two sources, each with one radio component.


Catalog Bibcode

2006AJ....132.2409N

References

Deep ATLAS radio observations of the Chandra Deep Field-South/Spitzer
wide-area infrared extragalactic field.
    Norris R.P., Afonso J., Appleton P.N., Boyle B.J., Ciliegi P., Croom S.M.,
    Huynh M.T., Jackson C.A., Koekemoer A.M., Lonsdale C.J., Middelberg E.,
    Mobasher B., Oliver S.J., Polletta M., Siana B.D., Smail I., Voronkov M.A.
   <Astron. J., 132, 2409-2423 (2006)>
   =2006AJ....132.2409N

Provenance

This table was created by the HEASARC in August 2012 based on CDS Catalog J/AJ/132/2409 file table4.dat.

Parameters

Name
The designation for the radio component recommended by the Dictionary of Nomenclature of Celestial Objects, viz., 'ATCDFS JHHMMSS.ss-DDMMSS.s', where the prefix stands for Australia Telescope Chandra Deep Field-South, and the numerical string is the J2000.0 equatorial coordinates of the component. In the case of single-component sources, this is identical to the source name used in Table 6 of the reference paper (the HEASARC ATLASCSID table).

Alt_Name
An alternative designation for the radio component recommended by the Dictionary of Nomenclature of Celestial Objects, viz., '[NAA2006] CNNN', where the prefix stands for Norris, Afonso, Appleton 2006, and the 'CNNN' part refers to the component NNN, an internal designation used in the paper.

RA
The Right Ascension of the component in the selected equinox. This was given in J2000.0 equatorial coordinates to a precision of 0.001 seconds of time in the original table. The actual positional error is expected to be of order 1 arcsecond or less for the unresolved radio components discussed in this study.

Dec
The Declination of the component in the selected equinox. This was given in J2000.0 equatorial coordinates to a precision of 0.1 arcseconds in the original table. The actual positional error is expected to be of order 1 arcsecond or less for the unresolved radio components discussed in this study.

LII
The Galactic Longitude of the component.

BII
The Galactic Latitude of the component.

RA_Error
The rms uncertainty in Right Ascension, in arcseconds. This includes the formal uncertainties derived from the Gaussian fit together with a potential systematic error in the position of the calibrator source of 0.1 arcseconds. Comparison of these positions with Spitzer positions in Section 3.3 of the reference paper shows that these estimated uncertainties are realistic.

Dec_Error
The rms uncertainty in Declination, in arcseconds. This includes the formal uncertainties derived from the Gaussian fit together with a potential systematic error in the position of the calibrator source of 0.1 arcseconds. Comparison of these positions with Spitzer positions in Section 3.3 of the reference paper shows that these estimated uncertainties are realistic.

Flux_1p4_GHz
The peak flux density of the fitted Gaussian component at 20 cm, in mJy/beam. The estimated uncertainty is 20% of this value added in quadrature with the rms given in the rms_1p4_ghz parameter value.

Int_Flux_1p4_GHz
The integrated flux density of the fitted Gaussian component at 20 cm, in mJy. The estimated uncertainty is 20% of this value added in quadrature with the rms given in the rms_1p4_ghz parameter value.

Major_Axis
The deconvolved FWHM major axis of the Gaussian fit component, in arcseconds. If the undeconvolved fitted major axis size was within one formal standard error of the restoring beam size, it was set to zero.

Minor_Axis
The deconvolved FWHM minor axis of the Gaussian fit component, in arcseconds. If the undeconvolved fitted minor axis size was within one formal standard error of the restoring beam size, it was set to zero.

Position_Angle
The major-axis position angle of the Gaussian fit component (measured Eastwards from North), in degrees.

RMS_1p4_GHz
The value, in mJy/beam (converted by the HEASARC from the units of microJy/beam used in the original table), of the rms map generated by SExtractor at the position of the component.

Comments
Notes about the component, if any.


Contact Person

Questions regarding the ATLASCSCPT database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 27-Aug-2012