Browse
this table...

VVDS20CM - VLA-VIRMOS Deep Field 20-cm Source Catalog

HEASARC
Archive

Overview

The authors of this table conducted a deep survey (rms noise ~ 17 microJansky or uJy) with the Very Large Array (VLA) at 1.4 GHz, with a resolution of 6 arcseconds, of a 1 deg2 region included in the VIRMOS VLT Deep Survey that is centered at RA and Dec (J2000.0) of 02 26 00, -04 30 00, hereafter the VLA-VIRMOS Deep Field, or VLA-VDF. In the same field, they already had multiband photometry down to IAB = 25, and spectroscopic observations were to be obtained during the VIRMOS VLT survey. The homogeneous sensitivity over the whole field allowed them to derive a complete sample of 1054 radio sources (5-sigma limit) down to a limit of 0.08 mJy. In their paper, the authors give a detailed description of the data reduction and of the analysis of the radio observations, with particular care to the effects of clean bias and bandwidth smearing, and of the methods used to obtain the catalog of radio sources. To estimate the effect of the resolution bias on their observations, they have modeled the effective angular-size distribution of the sources in their sample and they have used this distribution to simulate a sample of radio sources. Finally, they present the radio count distribution down to 0.08 mJy derived from the catalog. Their counts are in good agreement with the best fit derived from earlier surveys, and are about 50% higher than the counts in the Hubble Deep Field (HDF). The radio count distribution clearly shows, with extremely good statistics, the change in the slope for the sub-mJy radio sources.

19 of the 1054 radio sources were fitted with multiple components. In such cases, the authors list in the catalog an entry for each of the components, identified with a trailing letter (A, B, C or D) in the source name, and an entry for the whole source, identified with a trailing T in the source name. In these cases the total flux was calculated using the task TVSTAT, which allows the integration of the map values over irregular areas, and the sizes are the largest angular sizes. Thus, this catalog contains 1103 entries on 1054 sources, including 49 entries on individual components of composite sources.


Catalog Bibcode

2003A&A...403..857B

References

The VLA-VIRMOS Deep Field.
I. Radio observations probing the {mu}Jy source population.
      Bondi M., Ciliegi P., Zamorani G., Gregorini L., Vettolani G., Parma P.,
      de Ruiter H., Le Fevre O., Arnaboldi M., Guzzo L., Maccagni D.,
      Scaramella R., Adami C., Bardelli S., Bolzonella M., Bottini D., Cappi A.,
      Foucaud S., Franzetti P., Garilli B., Gwyn S., Ilbert O., Iovino A.,
      Le Brun V., Marano B., Marinoni C., McCracken H.J., Meneux B., Pollo A.,
      Pozzetti L., Radovich M., Ripepi V., Rizzo D., Scodeggio M., Tresse L.,
      Zanichelli A., Zucca E.
     <Astron. Astrophys. 403, 857 (2003)>
     =2003A&A...403..857B

Provenance

This table was created by the HEASARC in February 2012 based on CDS Catalog J/A+A/403/857 file catalog.dat.

Parameters

Name
The name of the radio source using the IAU-style designation for the source based on the truncated J2000.0 equatorial coordinates of its position, viz., 'VIRMOS 1.4GHz JHHMMSS-DDMMSSA', where the 'VIRMOS 1.4GHz' prefix stands for 'Visible and Infrared Multi-Object Spectrographs, 1.4 GHz source'. This naming convention has been registered with the CDS Dictionary of Nomenclature of Celestial Objects. The final character, if alphabetic, indicates that the source has multiple components: if 'A', 'B', 'C', or 'D', the listed properties refer to the specific component, while if 'T', the listed properties are for the complete composite source.

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

Dec
The Declination of the radio source in the selected equinox. This was given in J2000.0 equatorial coordinated 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.

RA_Error
The rms uncertainty in the Right Ascension of the radio source, in arcseconds.

Dec_Error
The rms uncertainty in the Declination of the radio source, in arcseconds.

Flux_20_cm
The peak brightness or flux density of the radio source at 1.4 GHz, in mJy/beam.

Flux_20_cm_Error
The rms uncertainty uncertainty in the peak brightness or flux density of the radio source at 1.4 GHz, in mJy/beam

Int_Flux_20_cm
The total (integrated) flux density of the radio source at 1.4 GHz, in mJy. For the unresolved sources, the total flux density is equal to the peak brightness.

Int_Flux_20_cm_Error
The rms uncertainty in the total (integrated) flux density of the radio source at 1.4 GHz, in mJy

Major_Axis
The major axis of the radio source (if resolved), in arcseconds. For the unresolved sources, the angular size is undetermined.

Minor_Axis
The minor equal of the radio source (if resolved), in arcseconds. For the unresolved sources, the angular size is undetermined.

Position_Angle
The position angle of the major axis of the radio source, in degrees, measured from North towards East. For the unresolved sources, this is undetermined.


Contact Person

Questions regarding the VVDS20CM database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 22-Feb-2012