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ROS13HRVLA - ROSAT/XMM-Newton 13-hr Deep Field VLA 20-cm Source Catalog

HEASARC
Archive

Overview

In order to determine the relationship between the faint X-ray and faint radio source populations, and hence to help understand the X-ray and radio emission mechanisms in those faint source populations, the authors have made a deep 1.4-GHz Very Large Array radio survey of the 13h 34m 37s, +37o 54' 44" (J2000) ROSAT/XMM-Newton X-ray Survey Area (McHardy et al. 1998, MNRAS, 295, 641; Loaring et al. 2005, MNRAS, 362, 1371: the catalog of XMM-Newton sources from the latter paper is available at the HEASARC as the ROS13HRXMM table). From a combined VLA data set of 10 hours of B-configuration data and 14 hours of A-configuration data, maps with 3.35-arcsec resolution and a noise limit of 7.5 microJansky (uJy) were constructed. A complete sample of 449 sources was detected within a 30-arcmin diameter region above a 4-sigma detection limit of 30 uJy, at the map center, making this one of the deepest radio surveys at this frequency. The differential source count shows a significant upturn at sub-milliJansky flux densities, similar to that seen in other deep surveys at 1.4 GHz (e.g. the Phoenix survey, Hopkins et al. 2003, AJ, 125, 465: available at the HEASARC as the PDS1P4GHZ table), but larger than that seen in the Hubble Deep Field (HDF) which may have been selected to be underdense. This upturn is well modeled by the emergence of a population of medium-redshift star-forming galaxies which dominate at faint flux densities. The brighter source counts are well modeled by active galactic nuclei.

This HEASARC table contains the catalog of 449 radio sources in a region of 30-arcmin diameter centered on the ROSAT/XMM 13-hours field which were detected at 1.4 GHz (20 cm) above a detection threshold of 4 sigma, equivalent to 30 uJy at the phase center.


Catalog Bibcode

2004MNRAS.352..131S

References

Radio observations of the 13hXMM-Newton/ROSAT Deep X-ray Survey Area.
    Seymour N., McHardy I.M., Gunn K.F.
   <Mon. Not. R. Astron. Soc., 352, 131-141 (2004)>
   =2004MNRAS.352..131S

Provenance

This table was created by the HEASARC in July 2013 based on CDS Catalog J/MNRAS/352/131 file table a1.dat.

Parameters

Source_Number
A unique source identification number in order of decreasing integrated 20-cm flux density, i.e., source number 1 is the brightest source.

Name
The radio source designation, using the designation recommended by the Dictionary of Nomenclature of Celestial Objects, viz., '[SMG2004] NNN', where the prefix stands for 'Seymour, McHardy, Gunn 2004' and NNN is the source number.

RA
The Right Ascension of the radio source in the selected equinox. This was given in J2000.0 equatorial coordinates to a precision of 0.001 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 coordinates to a precision of 0.01 arcseconds in the original table.

LII
The Galactic Longitude of the radio source.

BII
The Galactic Latitude of the radio source.

Angular_Size
The mean angular size of the radio source, in arcseconds; a value of 0.0 means that the source is unresolved.

SNR
The signal-to-noise ratio of the radio source detection, before corrections were made for the attenuation of the primary beam.

Flux_20_cm
The peak 1.4-GHz flux density of the radio source, in mJy/beam, corrected for the primary beam attenuation and bandwidth smearing effects. The units for this parameter were converted by the HEASARC from the uJy/beam units used in the original table.

Int_Flux_20_cm
The integrated (total) 1.4-GHz flux density of the radio source, in mJy, corrected for the primary beam attenuation and bandwidth smearing effects. The units for this parameter were converted by the HEASARC from the uJy units used in the original table.

Int_Flux_20_cm_Error
The uncertainty in the integrated 1.4-GHz flux density of the radio source, in mJy, corrected for the primary beam attenuation and bandwidth smearing effects. The units for this parameter were converted by the HEASARC from the uJy units used in the original table.


Contact Person

Questions regarding the ROS13HRVLA database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 25-Jul-2013