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ATHDFSCCAT - Australia Telescope Hubble Deep Field-South Combined Source Catalog

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Overview

Deep radio observations of a wide region centered on the Hubble Deep Field-South (HDF-S) have been performed, providing one of the most sensitive sets of radio observations acquired on the Australia Telescope Compact Array (ATCA) to date. A central rms of ~ 10 microJy is reached at four frequencies (1.4, 2.5, 5.2, and 8.7 GHz). In this table, the combined 4-frequency AT-HDFS Catalog including fluxes and spectral indices for sources detected at 1.4, 2.5, 5.2, and/or 8.7 GHz observations is presented to complement the single-frequency radio data for the 1.4 GHz observations which were presented in Paper II (Huynh et al., 2005, AJ, 130, 1373, available at the HEASARC as the ATHDFS1P4G table) in this series, and for the 2.5, 5.2, and/or 8.7 GHz observations which were presented in the reference paper (Paper III, Huynh et al., 2007, AJ, 133, 1331, available at the HEASARC as the ATHDFS3FRQ table).

The details of the observations and data reduction are discussed in detail in Paper I of this series (Norris et al., 2005, AJ, 130, 1358) and summarized in Table 1 of the reference paper. The radio observations were carried out by the ATCA over 4 years from 1998 to 2001. The observations at 1.4 and 2.5 GHz consist of single pointings centered on RA (J2000.0) = 22h 33m 25.96s, Dec (J2000.0) = -60o 38' 09.0". The observations at 5.2 and 8.7 GHz consist of single pointings centered on RA (J2000.0) = 22h 32m 56.22s, Dec (J2000.0) = -60o 33' 02.7". The 5.2 and 8.7 GHz observations are centered on the HST WFPC field, while the 1.4 and 2.5 GHz observations were pointed halfway between the WFPC field and a bright confusing source to allow the bright source to be well cleaned from the 1.4 and 2.5 GHz images.

This HEASARC table contains the final consolidated catalog of 473 individual sources and gives the flux densities at all frequencies for each individual radio source. It contains the 466 1.4-GHz sources from Paper II together with 5 unmatched 2.5-GHz sources and 2 unmatched 8.7-GHz sources. The procedure that the authors used to construct this catalog is discussed in Section 6 of the reference paper.


Catalog Bibcode

2007AJ....133.1331H

References

Radio observations of the Hubble Deep Field-South region.
III. The 2.5, 5.2, and 8.7 GHz catalogs and radio source properties.
    Huynh M.T., Jackson C.A., Norris R.P.
   <Astron. J., 133, 1331-1344 (2007)>
   =2007AJ....133.1331H

Provenance

This table was created by the HEASARC in December 2012 based on the CDS Catalog J/AJ/130/1371 file table9.dat which contains the entire contents of Table 9 from the published paper.

Parameters

Name
The source designation for the consolidated sources (essentially the same schema as was used for the 1.4-GHz source catalog), e.g., 'ATHDFS JHHMMSS.s+DDMMSSA', as given by the authors and recommended by the CDS Dictionary of Nomenclature of Celestial Objects, using the 'ATHDFS' prefix (Australia Telescope Hubble Deep Field-South) and the J2000.0 equatorial coordinates of the source. The suffixes 'A', 'B', etc., are used for components of multiple sources.

RA
The Right Ascension of the radio source in the selected equinox. The RA was given in J2000.0 coordinates to a precision of 0.01 seconds of time in the original table.

Dec
The Declination of the radio source in the selected equinox. The Dec was given in J2000.0 coordinates to a precision of 0.1 arcseconds in the original table.

LII
The Galactic Longitude of the radio source.

BII
The Galactic Latitude of the radio source.

Position_Origin
This positional coordinates flag parameter indicates the frequency from which the position was taken: L indicates 1.4 GHz, S indicates 2.5 GHz, C indicates 5.2 GHz and X indicates 8.7 GHz

Flux_1p4_GHz_Limit
This parameter is set to '<' if the corresponding parameter value is an upper limit rather than an actual measurement.

Flux_1p4_GHz
The radio source 1.4-GHz flux density, in mJy. The flux densities in this catalog are peak flux densities for sources undeconvolved at that particular frequency, otherwise integrated flux densities are presented.

Flux_2p5_GHz_Limit
This parameter is set to '<' if the corresponding parameter value is an upper limit rather than an actual measurement.

Flux_2p5_GHz
The radio source 2.5-GHz flux density, in mJy. The flux densities in this catalog are peak flux densities for sources undeconvolved at that particular frequency, otherwise integrated flux densities are presented. A blank value indicates that the source lies outside the cataloged region.

Flux_2p5_GHz_Flag
This flag parameter is set to 'S' to indicates that the flux density is that of one of the low-SNR 'supplementary' sources at 2.5 GHz.

Flux_5p2_GHz_Limit
This parameter is set to '<' if the corresponding parameter value is an upper limit rather than an actual measurement.

Flux_5p2_GHz
The radio source 5.2-GHz flux density, in mJy. The flux densities in this catalog are peak flux densities for sources undeconvolved at that particular frequency, otherwise integrated flux densities are presented. A blank value indicates that the source lies outside the cataloged region.

Flux_5p2_GHz_Flag
This flag parameter is set to 'S' to indicates that the flux density is that of one of the low-SNR 'supplementary' sources at 5.2 GHz.

Flux_8p7_GHz_Limit
This parameter is set to '<' if the corresponding parameter value is an upper limit rather than an actual measurement.

Flux_8p7_GHz
The radio source 8.7-GHz flux density, in mJy. The flux densities in this catalog are peak flux densities for sources undeconvolved at that particular frequency, otherwise integrated flux densities are presented. A blank value indicates that the source lies outside the cataloged region.

Flux_8p7_GHz_Flag
This flag parameter is set to 'S' to indicates that the flux density is that of one of the low-SNR 'supplementary' sources at 8.7 GHz.

Spectral_Index_Ls_Limit
This parameter is set to '<' or to '>' if the corresponding parameter value is an upper or lower limit, respectively, rather than an actual measurement.

Spectral_Index_Ls
The spectral index alpha of the radio source between 1.4 and 2.5 GHz, where Snu ~ nualpha and Snu is the flux density at the frequency nu. The radio spectral indices are calculated from flux densities measured on low-resolution images, as discussed in Section 7 of the reference paper.

Spectral_Index_Ls_Error
The uncertainty in the corresponding spectral index of the radio source.

Spectral_Index_Sc
The spectral index alpha of the radio source between 2.5 and 5.2 GHz, where Snu ~ nualpha and Snu is the flux density at the frequency nu. The radio spectral indices are calculated from flux densities measured on low-resolution images, as discussed in Section 7 of the reference paper.

Spectral_Index_Sc_Error
The uncertainty in the corresponding spectral index of the radio source.

Spectral_Index_Cx
The spectral index alpha of the radio source between 5.2 and 8.7 GHz, where Snu ~ nualpha and Snu is the flux density at the frequency nu. The radio spectral indices are calculated from flux densities measured on low-resolution images, as discussed in Section 7 of the reference paper.

Spectral_Index_Cx_Error
The uncertainty in the corresponding spectral index of the radio source.

AGN_Flag
This flag is set to non-blank values to indicate that the source has been classified by the authors as either an AGN or as a GHz-peaked spectrum (GPS) source (a subclass of AGN) using the following criteria (discussed in more detail in Section 7 ofthe reference paper):

      AGN = AGN with flat or inverted spectrum (S1.4 < 0.5 mJy and {alpha} > 0
            or S1.4 > 0.5 mJy and {alpha} >- 0.3),
      GPS = GigaHertz Peaked Spectrum, for AGN where the spectrum is
            inverted between 1.4 and 2.5, but steep at higher frequency.
  

Contact Person

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

Page Author: Browse Software Development Team
Last Modified: 10-Dec-2012