ATHDFS3FRQ - Australia Telescope Hubble Deep Field-South 2.5, 5.2 and 8.7-GHz Source Catalog
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 observations consist of single pointings centered on RA (J2000.0) = 22h 33m 25.96s, Dec (J2000.0) = -60o 38' 09.0" (2.5 GHz), and RA (J2000.0) = 22h 32m 56.22s, Dec (J2000.0) = -60o 33' 02.7" (5.2 and 8.7 GHz). The 5.2 and 8.7 GHz observations are centered on the HST WFPC field, while the 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 2.5 GHz image.
At 5 sigma, the 5.2 and 8.7 GHz catalogs have over 96% reliability. At 2.5 GHz, the authors have enough statistics to examine the 5 - 5.5 sigma sources, and find that these are only about 40% reliable. With a SNR greater than 5.5 sigma, the 2.5 GHz catalog would have about 99% reliability. The authors thus cut off the catalogs at 5.5, 5, and 5 sigma for 2.5, 5.2, and 8.7 GHz, respectively. The final catalogs have 71, 24, and 6 sources at 2.5, 5.2, and 8.7 GHz, respectively. Given a prior 1.4 GHz position, it may be feasible to push the detection limit lower than 5 sigma. The authors searched for low-SNR sources by matching 3 - 5 sigma sources that lie within 2 sigma positional uncertainty of a 1.4 GHz source. The positional uncertainty was determined by adding the average 1.4 GHz uncertainty (1.1") in quadrature with the positional uncertainty of a 3 sigma source. At 2.5 GHz the allowed positional offset is 3.8", and for 5.2 and 8.7 GHz it is 2.8". Thus, there are 71, 18, and 2 sources at 2.5, 5.2, and 8.7 GHz, respectively, which are low-SNR high-frequency counterparts to 1.4 GHz sources. The authors included these sources in supplementary catalogs.
This HEASARC table contains all 101 primary sources detected at 2.5, 5.2, and 8.7 GHz, as well as the 91 supplementary sources described above (the latter are flagged by having source_flag values of 'S'), for a grand total of 192 radio sources.
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
The source designation recommended by the CDS Dictionary of Nomenclature of Celestial Objects, e.g., for 2.5-GHz sources, using the prefix '[HJN2007] 2.5GHz' for Huynh, Jackson, Norris 2007 2.5-GHz and the source number, e.g., '[HJN2007] 2.5GHz 1' for 2.5-GHz source number 1, for 5.2-GHz sources, the prefix '[HJN2007] 5.2GHz' and for 8.7-GHz sources, the prefix '[HJN2007] 8.7GHz'. The numbering for the supplementary sources starts from the end of the primary sources: thus, the sources named '[HJN2007] 2.5GHz 72-142', '[HJN2007] 5.2GHz 25-42' and '[HJN2007] 8.7GHz 7-8' are all supplementary sources.
The frequency corresponding to the source detection, 2.5 GHz, 5.2 GHz or 8.7 GHz, in GHz.
This flag parameter is set to 'S' to differentiate supplementary sources (see the Overview above for a definition of this class) from the primary sources of higher statistical significance.
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 tables.
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.
The 1-sigma error in the Right Ascension of the radio source, in arcseconds.
The 1-sigma error in the Declination of the radio source, in arcseconds.
The Galactic Longitude of the radio source.
The Galactic Latitude of the radio source.
The radio source peak flux density, in millijanskys (per beam). The values given here are not corrected for the systematic effects described in Section 3 of the reference paper. ATCA fluxes are generally estimated to be accurate to about 10%.
The radio source integrated flux density, in millijanskys.
This flag parameter is set to '2' to indicates that the Gaussian fit has likely resulted in a poor integrated flux density.
The deconvolved major axis (FWHM) of the radio source, in arcseconds. The value is only given for successfully deconvolved sources.
The deconvolved minor axis (FWHM) of the radio source, in arcseconds. The value is only given for successfully deconvolved sources.
The deconvolved position angle (PA, measured from North through East) of the source, in degrees. The value is only given for successfully deconvolved sources.
The signal-to-noise ratio (SNR) of the detection, calculated as the value of the IMSAD fitted peak divided by the local rms noise.