PDSOID2 - Phoenix Deep Survey Optical and Near-Infrared Counterparts Catalog 2

Overview

The Phoenix Deep Survey (PDS) is a multi-wavelength galaxy survey based on deep 1.4-GHz radio imaging. The revised version of the radio source catalog was published by Hopkins et al. (2003). The primary goal of the PDS is to investigate the properties of star formation in galaxies and to trace the evolution in those properties to a redshift z = 1, covering a significant fraction of the age of the universe. By compiling a sample of star-forming galaxies based on selection at radio wavelengths, Sullivan et al. (2004, the reference paper for this present catalog) eliminate possible biases due to dust obscuration, a significant issue when selecting objects at optical and ultraviolet wavelengths. In this study, they present the catalogs and results of deep optical (UBVRI) and near-infrared (K_s) imaging of the deepest region of the existing decimetric radio imagery. The observations and data processing are summarized and the construction of the optical source catalogs described in their paper, together with the details of the identification of candidate optical counterparts to the radio catalogs. Based on their UBVRIK_s imaging, photometric redshift estimates for the optical counterparts to the radio detections are explored.

Two pointings (labeled 7 and 3 in Table 1 of the reference paper) were observed in BVRi, and one (pointing 11 in ibid.) in BVi on the nights of 2001 August 13 and 14, with the WFI camera on the Anglo-Australian Telescope (AAT). The same three pointings were also observed in U with the Mosaic-II camera on the Cerro Tololo Inter-American Observatory (CTIO) 4-m Blanco telescope on 2002 September 3. Finally, four of the PDS fields (2, 3, 6, 7) were observed in U with the WFI on the European Southern Observatory (ESO) 2.2-m telescope on the night of 2001 August 18.

The NIR imaging data come from the Hawaii HgCdTe 1024 x 1024 pixel array SoFI camera on the 3.6-m ESO New Technology Telescope (NTT). The field of view was 4.9' x 4.9' with a pixel scale of 0.29". Nine contiguous pointings, in a 3 x 3 pattern, were observed over the deepest region of the PDS (a sub-region of pointing 7; see Fig. 1 of the reference paper), during 2000 October 10 and October 11.

Throughout this study, the authors assume an Omega_Lambda = 0.7, Omega_M = 0.3, h = 0.70 (where H₀ = 100 h km s^-1 Mpc^-1) cosmology.

Catalog Bibcode

2004ApJS..155....1S

References

The Phoenix Deep Survey: optical and near-infrared imaging catalogs.
    Sullivan M., Hopkins A.M., Afonso J., Georgakakis A., Chan B., Cram L.E.,
    Mobasher B., Almeida C.
   <Astrophys. J. Suppl. Ser., 155, 1-13 (2004)>
   =2004ApJS..155....1S
The Phoenix Deep Survey: The 1.4 GHz microJansky catalog.
    Hopkins A.M., Afonso J., Chan B., Cram L.E., Georgakakis A., Mobasher B.
   <Astron. J., 125, 465-477 (2003)>
   =2003AJ....125..465H

Provenance

This table was created by the HEASARC in June 2013 based on an electronic version of Table 6 from the reference paper, which details the photometric (optical and near-infrared) properties and redshifts of 778 radio sources in the PDS, which was obtained from the CDS web site (their catalog J/ApJS/155/1 file table6.dat). The HEASARC has changed the name prefixes of the sources in this table from 'PDS' (Phoenix Deep Survey) to 'PDF' (Phoenix Deep Field) as recommended by the CDS Dictionary of Astronomical Nomenclature. Three duplicate entries were removed from the catalog in June 2019.

Parameters

Name
The Phoenix Deep Survey J2000.0 positional-based source designation, viz. 'PDF JHHMMSS.S+DDMMSS', where the prefix stands for Phoenix Deep Field and is recommended by the CDS Dictionary of Astronomical Nomenclature in place of the 'PDS' prefix used in the as-published table. The HEASARC notes that the names and positions in this table (from the Sullivan et al. 2004 reference paper) differ slightly from those given in the catalog of radio sources (Hopkins et al. 2003). The reasons for this are not known to the HEASARC: one possibility is that the names and positions in this table are based on the positions of the optical/near-infrared counterparts rather than on the positions of the radio sources themselves.

RA
The Right Ascension of the source in the selected equinox. This was created by the HEASARC based on the J2000.0 position-based name given herein which has a precision of 0.1 seconds of time.

Dec
The Declination of the source in the selected equinox. This was created by the HEASARC based on the J2000.0 position-based name given herein which has a precision of 1 arcsecond.

LII
The Galactic Longitude of the source.

BII
The Galactic Latitude of the source.

Umag_Limit
This limit flag is set to '>' if the source was not detected in this particular band, specifically, if the net flux at the source position was negative. The corresponding quoted magnitude in such cases is the formal 5-sigma limit.

Umag
The U-band magnitude of the optical/NIR counterpart to the radio source..

Umag_Error
The uncertainty in the U-band magnitude of the optical/NIR counterpart to the radio source.

Umag_Flag
This flag parameter is set to '1' if the quoted corresponding magnitude was for a detection at a level below the 5-sigma detection threshold in this particular band.

Bmag_Limit
This limit flag is set to '>' if the source was not detected in this particular band, specifically, if the net flux at the source position was negative. The corresponding quoted magnitude in such cases is the formal 5-sigma limit.

Bmag
The B-band magnitude of the optical/NIR counterpart to the radio source.

Bmag_Error
The uncertainty in the B-band magnitude of the optical/NIR counterpart to the radio source.

Bmag_Flag
This flag parameter is set to '1' if the quoted corresponding magnitude was for a detection at a level below the 5-sigma detection threshold in this particular band.

Vmag_Limit
This limit flag is set to '>' if the source was not detected in this particular band, specifically, if the net flux at the source position was negative. The corresponding quoted magnitude in such cases is the formal 5-sigma limit

Vmag
The V-band magnitude of the optical/NIR counterpart to the radio source.

Vmag_Error
The uncertainty in the V-band magnitude of the optical/NIR counterpart to the radio source.

Vmag_Flag
This flag parameter is set to '1' if the quoted corresponding magnitude was for a detection at a level below the 5-sigma detection threshold in this particular band.

Rmag_Limit
This limit flag is set to '>' if the source was not detected in this particular band, specifically, if the net flux at the source position was negative. The corresponding quoted magnitude in such cases is the formal 5-sigma limit

Rmag
The Cousins R-band magnitude R_c of the optical/NIR counterpart to the radio source.

Rmag_Error
The uncertainty in the Cousins R-band magnitude of the optical/NIR counterpart to the radio source.

Rmag_Flag
This flag parameter is set to '1' if the quoted corresponding magnitude was for a detection at a level below the 5-sigma detection threshold in this particular band.

Imag_Limit
This limit flag is set to '>' if the source was not detected in this particular band, specifically, if the net flux at the source position was negative. The corresponding quoted magnitude in such cases is the formal 5-sigma limit

Imag
The Cousins I-band magnitude of the optical/NIR counterpart to the radio source. The i-band data, however, were actually obtained through an SDSS i-band filter and not a Cousins-I filter (I_c), and a non-negligible color term was required to align these data into the I_c system of the standard stars. The authors found that to convert their measured CCD photometry with this filter, i_CCD, to the standard Cousins system (I_c) required a transformation of the form I_c = i_CCD - 0.194 * (R_c - I_c), where i_CCD is the calibrated i-band magnitude with no color term applied and R_c is the calibrated R_c-band magnitude.

Imag_Error
The uncertainty in the Cousins I-band magnitude of the optical/NIR counterpart to the radio source.

Imag_Flag
This flag parameter is set to '1' if the quoted corresponding magnitude was for a detection at a level below the 5-sigma detection threshold in this particular band.

Ks_Mag_Limit
This limit flag is set to '>' if the source was not detected in this particular band, specifically, if the net flux at the source position was negative. The corresponding quoted magnitude in such cases is the formal 5-sigma limit

Ks_Mag
The K-band magnitude, K_s, of the optical/NIR counterpart to the radio source.

Ks_Mag_Error
The uncertainty in the K-band magnitude of the optical/NIR counterpart to the radio source.

Ks_Mag_Flag
This flag parameter is set to '1' if the quoted corresponding magnitude was for a detection at a level below the 5-sigma detection threshold in this particular band.

Redshift
The spectroscopic redshift of the optical/NIR counterpart to the radio source.

Phot_Redshift
The photometric redshift of the optical/NIR counterpart to the radio source. See Section 4 of the reference paper for the details of the photometric redshift analysis.

Phot_Redshift_Error
The uncertainty in the photometric redshift of the optical/NIR counterpart to the radio source.

Contact Person

Questions regarding the PDSOID2 database table can be addressed to the HEASARC Help Desk.

Page Author: Browse Software Development Team
Last Modified: Monday, 16-Sep-2024 17:32:55 EDT