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ATHDFSOID - Australia Telescope Hubble Deep Field-South Optical Identifications Catalog

HEASARC
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Overview

The Australia Telescope Hubble Deep Field-South (ATHDF-S) survey of the Hubble Deep Field-South (HDF-S) reaches sensitivities of ~ 10 microJy (uJy) at 1.4, 2.5, 5.2, and 8.7 GHz, making the ATHDF-S one of the deepest surveys ever performed with the Australia Telescope Compact Array (ATCA). This table contains the optical identifications of the ATHDF-S radio sources (the radio data from which are available in summarized form in the HEASARC ATHDFSCCAT table) using data from the literature. The authors find that ~ 66% of the radio sources have optical counterparts to an I magnitude of 23.5 mags. Deep Hubble Space Telescope (HST) imaging of the area identifies a further 12% of the radio sources. In this table, the authors present data from new spectroscopic observations for 98 of the radio sources and supplement these spectroscopic redshifts with photometric ones calculated from five-band optical imaging.

The radio observations and data reduction are detailed in Papers I-III of this series:

I   = Norris et al., 2005, AJ, 130, 1358;
II  = Huynh et al., 2005, AJ, 130, 1373, available at the HEASARC as the
       ATHDFS1P4G table;
III = Huynh et al., 2007, AJ, 133, 1331, available at the HEASARC as the
       ATHDFSCCAT and ATHDFS3FRQ tables.
Palunas et al. (2000, ApJ, 541, 61) observed the HDF-S region using the Big Throughput Camera (BTC) on the Cerro Tololo Inter-American Observatory (CTIO) 4m during 1998 September. Images were taken in the Sloan Digital Sky Survey (SDSS) u, Johnson B and V, and Cousins R and I filters. In addition, the authors obtained spectra of the ATHDF-S radio sources over two service nights in 2001 July and 2003 October using the multi-fiber 2dF instrument of the Anglo-Australian Telescope (AAT). They acquired low-resolution (9 Angstrom) spectra over the wavelength range from 3800 to 8000 Angstroms.

Catalog Bibcode

2008AJ....135.2470H

References

Radio observations of the Hubble Deep Field-South region.
IV. Optical properties of the faint radio population.
    Huynh M.T., Jackson C.A., Norris R.P., Fernandez-Soto A.
   <Astron. J., 135, 2470-2495 (2008)>
   =2008AJ....135.2470H

Provenance

This table was created by the HEASARC in December 2012 based on the CDS Catalog J/AJ/135/2470 files table1.dat and table10.dat which contain the entire contents of Tables 1 and 10 from the published paper.

Parameters

Name
The source designation for the ATHDF-S radio sources, 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. This was not given in the present reference (Paper IV) but was taken from Table 9 of paper III, the 'Combined ATHDFS Catalog'. The RA was given therein in J2000.0 coordinates to a precision of 0.01 seconds of time.

Dec
The Declination of the radio source in the selected equinox. This was not given in the present reference (Paper IV) but was taken from Table 9 of paper III, the 'Combined ATHDFS Catalog'. The Dec was given therein in J2000.0 coordinates to a precision of 0.1 arcseconds.

LII
The Galactic Longitude of the radio source.

BII
The Galactic Latitude of the radio source.

CTIO_Flag
This flag parameter gives the status of the CTIO counterpart to the radio source:

      YES = there is a CTIO counterpart within the 1.8 arcsec matching radius,
       NO = there is no CTIO counterpart within the 1.8 arcsec matching radius,
        S = there is a nearby bright star which may affect the photometry,
      OUT = the source lies outside of the CTIO images.
  

CTIO_Source_Number
The CTIO source ID, corresponding to the source number from the CTIO Catalog (P. Palunas et al. 2008, submitted).

Umag
The SDSS u-band magnitude (in the AB System) of the CTIO counterpart to the radio source.

Umag_Error
The rms error in the corresponding magnitude.

Bmag
The Johnson B-band magnitude (in the AB System) of the CTIO counterpart to the radio source.

Bmag_Error
The rms error in the corresponding magnitude.

Vmag
The Johnson V-band magnitude (in the AB System) of the CTIO counterpart to the radio source.

Vmag_Error
The rms error in the corresponding magnitude.

Rmag
The Cousins R-band magnitude (in the AB System) of the CTIO counterpart to the radio source.

Rmag_Error
The rms error in the corresponding magnitude.

Imag
The Cousins I-band magnitude (in the AB System) of the CTIO counterpart to the radio source.

Imag_Error
The rms error in the corresponding magnitude.

Phot_Redshift
The photometric redshift zphot of the CTIO counterpart to the radio source. The technique for calculating the zphot values is described in section 4 of the reference paper.

Phot_Redshift_Error
The uncertainty in the photometric redshift zphot. The reliability of the zphot estimates is described in section 4 of the reference paper.

Wfpc2_Flag
This HEASARC-created flag parameter is set to 'Y' to indicate that information on a WFPC2 counterpart to the radio source is presented in Table 2 and/or Table 5 of the reference paper, and is also presented here (notice that the source ATHDFS J223247.6-603337 is listed twice below as a counterpart was detected in both the main deep field and a flanking field observation):

              Summary of WFPC2 Counterparts in Main Deep Field Observations (Table 2) and Flanking Fields (Table 5)

     Table        ATHDFS Name          FF ID      F300       F450      F606       F814      Morphological Information
                                                  (mag)      (mag)     (mag)      (mag)

        2     ATHDFS J223258.5-603346         27.53 0.68 28.48 0.77 27.05 0.13 25.12 0.04   No info
        2     ATHDFS J223247.6-603337         22.70 0.02 21.69 0.00 20.55 0.00 19.55 0.00   Late-type spiral
        2     ATHDFS J223253.1-603329         25.00 0.07 24.31 0.02 23.69 0.01 22.56 0.00   No info
        2     ATHDFS J223302.8-603323         25.45 0.19 23.60 0.02 23.36 0.01 22.79 0.01   Barred spiral
        5     ATHDFS J223207.9-603928  WdpVI                        26.46 0.21 25.61 0.15   No info
        5     ATHDFS J223253.7-603921  W9                                      21.12 0.01   Possible merging system
        5     ATHDFS J223245.6-603857  W9                                      23.91 0.04   No info
        5     ATHDFS J223248.2-603805  W9                                      20.90 0.01   Edge-on disk galaxy
        5     ATHDFS J223254.5-603748  W9                                      18.44 0.00   Barred spiral
        5     ATHDFS J223202.5-603714  WdpVI                        25.86 0.11 24.17 0.04   Possible merging system
        5     ATHDFS J223253.0-603539  W6                                      23.45 0.04   No info
        5     ATHDFS J223245.3-603537  W6                                      24.04 0.06   No info
        5     ATHDFS J223338.8-603523  W8                                      18.99 0.00   Early-type spiral
        5     ATHDFS J223344.9-603515  W8                                      19.51 0.00   Spiral galaxy in merging system
        5     ATHDFS J223350.5-603503  W8                                      26.24 0.19   No info
        5     ATHDFS J223307.1-603448  W3                                      24.83 0.08   No info
        5     ATHDFS J223243.3-603443  W2                                      19.32 0.00   Merging system
        5     ATHDFS J223245.5-603419  W2                                      21.10 0.01   Possible merger
        5     ATHDFS J223311.9-603417  W3                                      23.93 0.05   No info
        5     ATHDFS J223306.0-603350  W3                                      17.25 0.00   Face-on spiral
        5     ATHDFS J223243.4-603352  W2                                      19.87 0.00   Point-like, quasar
        5     ATHDFS J223247.6-603337  W2                                      19.64 0.01   Spiral
        5     ATHDFS J223337.5-603329  W8                                      17.70 0.00   Bright point source (STIS QSO)
        5     ATHDFS J223339.4-603306  W8                                      24.81 0.10   No info
        5     ATHDFS J223308.6-603251  W1                                      21.03 0.01   Spheroidal
        5     ATHDFS J223317.7-603235  W4                                      20.83 0.01   Spheroidal
        5     ATHDFS J223331.6-603222  W7                                      20.38 0.01   Merging system, triple nuclei
        5     ATHDFS J223303.1-603132  W1                                      24.05 0.05   No info
  

Nicmos_Flag
This HEASARC-created flag parameter is set to 'Y' to indicate that information on a NICMOS counterpart to the radio source is presented in Table 3 and/or Table 5 of the reference paper, and is also presented here:

            Summary of NICMOS Counterparts in Main Deep Field Observations (Table 3) and Flanking Fields (Table 5)

     Table        ATHDFS Name       FF ID     F110         F160         F222        Morphological Information
                                              (mag)        (mag)        (mag)


        3 ATHDFS J223253.7-603921          21.20 0.05   19.97 0.02   19.38 0.07     No info
        5 ATHDFS J223250.6-604336   N9                  22.06 0.02                  Possible merging system
        5 ATHDFS J223337.5-604006   N8                  19.66 0.00                  Merging system
        5 ATHDFS J223334.4-603804   N7                  22.30 0.09                  No info (at edge of image)
        5 ATHDFS J223210.3-604433   dpJH   20.45 0.03   19.83 0.01                  No info (at edge of image)
  

Stis_Flag
This HEASARC-created flag parameter is set to 'Y' to indicate that information on a STIS counterpart to the radio source is presented in Table 4 and/or Table 5 of the reference paper, and is also presented here:

             Summary of STIS Counterparts in Main Deep Field Observations (Table 4) and Flanking Fields (Table 5)

     Table        ATHDFS Name          FF ID     50ccd       lp          NUV          FUV        Morphological Information
                                                 (mag)      (mag)       (mag)        (mag)

       4     ATHDFS J223337.5-603329          17.83 0.00  17.48 0.00  . .. ...     29.13 0.00    Bright point source (STIS QSO)
       4     ATHDFS J223339.4-603306          24.76 0.01  24.46 0.04  41.00 0.00   37.33 0.00    Irregular and disturbed, Possible
                                                                                                  merging system
       5     ATHDFS J223425.0-603452    S8    23.18 0.01                                         Disturbed, merging system
       5     ATHDFS J223327.6-603414    S2    28.17 0.18                                         No info
  

Redshift
The spectroscopic redshift z of the counterpart derived from the 2dF low-resolution spectrum. Redshifts were obtained for 98 out of the 268 targeted sources.

Redshift_Flag
This flag parameter represents the quality Q of the 2dF spectroscopy from which the redshift was obtained. A value of 3 indicates three or more lines were identified, and hence the redshift is very well determined. Two, one or no lines identified are indicated by Q values of 2, 1 or 0, respectively.

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

H_Beta_Flux
The H-beta line flux, in CCD Counts, of the optical counterpart to the radio source as measured in the 2dF spectrum.

H_Beta_Flux_Error
The uncertainty in the corresponding line flux, in CCD counts.

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

O_III_Flux
The O III 5007-Angstrom line flux, in CCD Counts, of the optical counterpart to the radio source as measured in the 2dF spectrum.

O_III_Flux_Error
The uncertainty in the corresponding line flux, in CCD counts.

H_Alpha_Flux
The H-alpha line flux, in CCD Counts, of the optical counterpart to the radio source measured in the 2dF spectrum.

H_Alpha_Flux_Error
The uncertainty in the corresponding line flux, in CCD counts.

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

N_II_Flux
The N II 6584-Angstrom Line Flux line flux, in CCD Counts, of the optical counterpart to the radio source measured in the 2dF spectrum.

N_II_Flux_Error
The uncertainty in the corresponding line flux, in CCD counts.

Spectra_Comments
This parameter contains comments on the optical 2dF spectra, including which lines were observed.

Broad_Type
A broad classification of the optical spectrum of the counterpart to the radio source, given for those 98 sources for which spectroscopic redshifts were obtained (this field is left blank for the remaining 375 sources), and coded as follows:

      abs = galaxy with absorption-line spectrum (22/98 = 22%)
       sf = star-forming galaxy (36/98 = 37%)
       sy = Seyfert galaxy (6/98 = 6%)
       BL = broad-line AGN (7/98 = 7%)
      unc = unclassified object
  

Class
The HEASARC Browse object classification based on the value of the broad_type parameter.


Contact Person

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

Page Author: Browse Software Development Team
Last Modified: 12-Dec-2012