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VLASXDF1P4 - VLA Subaru/XMM-Newton Deep Field 1.4-GHz Source Catalog

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Overview

This table contains results from the deep radio imaging at 1.4 GHz of the 1.3-deg2 Subaru/XMM-Newton Deep Field (SXDF), made with the Very Large Array (VLA) in B and C configurations. This resulted in a radio map of the entire field, and a catalog of 505 sources covering 0.8 deg2 to a peak flux density limit of 100 microJansky (uJy), which corresponds to signal-to-noise (S/N) ratios of between 5 and 8. Robust optical identifications are provided for 90 per cent of the sources, and suggested identifications are presented for all but 14 (of which seven are optically blank, and seven are close to bright contaminating objects). The authors show that the optical properties of the radio sources do not change with flux density, suggesting that active galactic nuclei (AGN) continue to contribute significantly at faint flux densities. they test this assertion by cross-correlating their radio catalog with the X-ray source catalog and conclude that radio-quiet AGN become a significant population at flux densities below 300 uJy, and may dominate the population responsible for the flattening of the radio source counts if a significant fraction of them are Compton-thick.

The SXDF was observed with NRAO's VLA in B-array using the 14 overlapping pointings arranged an an hexagonal pattern that are listed in Table 1 of the reference paper. Three test observations of pointings 1, 4 and 6 were taken on 2001 May 17, and the rest of the data were obtained in 13 runs, each lasting 4.5 hours, between 2002 August 10 and September 9. All 14 pointings were re-observed in C-array on 2003 January 15 to provide additional information on larger angular scales.

This table contains the catalog of 505 detected radio sources and their proposed optical counterparts (the latter taken mostly from the ultra-deep BRi'z' Suprime-Cam images of the SXDF). As mentioned above, 14 of these 505 radio sources have no suggested identifications. Additionally, 7 of the radio sources (source numbers 16, 114, 129, 263, 360, 361 and 488) have 2 listed optical identifications: in such cases, there are 2 entries for each source listed detailing the alternative optical counterparts, and with identical sets of radio parameters. Thus, there are 512 = 505 + 7 entries in this table.


Catalog Bibcode

2006MNRAS.372..741S

References

Radio imaging of the Subaru/XMM-Newton Deep Field.
I. The 100-{mu}Jy catalogue, optical identifications, and the nature of the
faint radio source population.
    Simpson C., Martinez-Sansigre A., Rawlings S., Ivison R., Akiyama M.,
    Sekiguchi K., Takata T., Ueda Y., Watson M.
   <Mon. Not. R. Astron. Soc., 372, 741-757 (2006)>
   =2006MNRAS.372..741S

Provenance

This table was created by the HEASARC in August 2013 based on CDS Catalog J/MNRAS/372/741 file table3.dat.

Parameters

Source_Number
A unique identification number for each VLA 1.4-GHz source in the catalog, in order of decreasing 1.4-GHz flux density.

Alt_Name
An alternative name for the radio source suggested by the Dictionary of Nomenclature of Celestial Objects, using the prefix '[SMR2006]' for Simpson, Martinez-Sansigre, Rawlings 2006 and the source number, e.g., '[SMR2006] 1'.

Name
The name for the radio source recommended by the Dictionary of Nomenclature of Celestial Objects, using the prefix '[SMR2006] VLA' for Simpson, Martinnez-Sansigre, Rawlings 2006, Very Large Array, and the J2000.0 equatorial source coordinates, e.g., '[SMR2006] VLA J020458-04468'.

RA
The Right Ascension of the 1.4-GHz radio source in the selected equinox. This was given in J2000 equatorial coordinates and to a precision of 0.01 seconds of time in the original source table.

Dec
The Declination of the 1.4-GHz radio source in the selected equinox. This was given in J2000 equatorial coordinates and to a precision of 0.01 arcseconds in the original source table

LII
The Galactic Longitude of the 1.4-GHz radio source.

BII
The Galactic Latitude of the 1.4-GHz radio source.

Flux_1p4_GHz
The flux density of the radio source at 1.4 GHz, in mJy (converted by the HEASARC from the uJy units used in the original table). The procedures used by the authors to calculate the flux densities are described in Section 3.1 of the reference paper.

Flux_1p4_GHz_Error
The uncertainty in the flux density of the radio source at 1.4GHz, in mJy (converted by the HEASARC from the uJy units used in the original table). The quoted uncertainties are those arising from the limited S/N of the map, ignoring calibration errors (the authors note from Fig. 3 of their paper that their flux density scale agrees well with that of the NVSS for the brightest sources, where such calibration errors will be most important).

Optid_Reliability
The reliability of the optical identification of the counterpart to the radio source, i.e., the probability that a particular optical object i is the correct identification for a radio source. This is discussed and defined in Section 4.1 of the reference paper. The authors assign as the primary optical counterpart the source with the largest reliability, but in the catalog they list all counterparts with R > 0.05. For various reasons, 22 of the 505 sources do not have formal reliability estimates, but the authors have made qualitative estimates in such cases (see the opt_id_reliability_qual parameter description below).

Optid_Reliability_Qual
This flag parameter contains a qualitative estimate of the reliability of the optical counterpart identification when a number is not listed in the optid_reliability parameter, as follows:

        A = reliable identification
        B = probable identification
        C = plausible identification
        - = certain identification
  

ID_Comments
Some comments on the more problematic cases of optical identification.

Optical_ID
The optical counterpart catalog identification.

Optical_RA
The Right Ascension of the optical counterpart of the VLA 1.4-GHz source in the selected equinox. This was given in J2000 equatorial coordinates and to a precision of 0.001 seconds of time in the original source table.

Optical_Dec
The Declination of the optical counterpart of the VLA 1.4-GHz source in the selected equinox. This was given in J2000 equatorial coordinates and to a precision of 0.01 arcseconds in the original source table.

Redshift
The spectroscopic redshift of the optical counterpart of the VLA 1.4-GHz source.

Redshift_Flag
This flag parameter is set to '?' to indicate that the redshift is considered to be uncertain.

Bmag
The B magnitude on the AB scale of the optical counterpart of the VLA 1.4-GHz source.

Vmag
The V magnitude on the AB scale of the optical counterpart of the VLA 1.4-GHz source.

Rmag
The R magnitude on the AB scale of the optical counterpart of the VLA 1.4-GHz source.

Imag
The i' (i-Prime) magnitude on the AB scale of the optical counterpart of the VLA 1.4-GHz source.

Zmag
The z' (z-Prime) magnitude on the AB scale of the optical counterpart of the VLA 1.4-GHz source.


Contact Person

Questions regarding the VLASXDF1P4 database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 1-Aug-2013