VLAHDF20CM - VLA Hubble Deep Field 20-cm Source Catalog
In 1996 November, the authors observed a field centered on the Hubble Deep Field (RA, Dec (J2000.0) = (12h 36m 49.4s, 62o 12' 58.00") for a total of 50 hours at 20 cm in the A configuration of the VLA. They reached an rms noise level near the center of the field of 7.5 uJy. They adopted 40 uJy as the formal completeness limit over the entire 1 degree field in their untapered naturally weighted 2 arcseconds image. The authors identified 314 sources within 20 arcminutes of the field center (20% power contour). They found 57 additional sources within this same region (presumably resolved at 2" resolution) in lower resolution (3.5 and 6") tapered images above completeness levels of 50 uJy at 3.5" resolution and 75 uJy at 6" resolution, making a grand total of 371 radio sources detected at 1.4 GHz within 20 arcminutes of the phase center of the field.
The nature of radio emission from distant galaxies: the 1.4 GHz observations. Richards E.A. <Astrophys. J. 533, 611 (2000)> =2000ApJ...533..611R
The source designation as given in the CDS Dictionary of Nomenclature of celestial Objects, viz., '[R2000] JHHMMSS.sss+DDMMSS.ss', where the prefix stands for Richards (200) and the J2000.0 coordinates of the source form the numerical part.
The Right Ascension of the radio source in the selected equinox. This was given in J2000.0 coordinates to a precision of 0.001 seconds of time in the original table.
The Declination of the radio source in the selected equinox. This was given in J2000.0 coordinates to a precision of 0.01 arcseconds in the original table.
The Galactic Longitude of the radio source.
The Galactic Latitude of the radio source.
The 1-sigma uncertainty in the Right Ascension of the radio source, in seconds of time.
The 1-sigma uncertainty in the Declination of the radio source, in arcseconds.
The integrated sky flux density of the radio source at 1.4 GHz, in milliJanskies (mJy), after correction for the instrumental gain (see Section 3.2 of the reference paper for motre details). The original units for this parameter in the reference paper were uJy. The HEASARC converted them to mJy to conform to its standard unit for radio flux densities.
The 1-sigma uncertainty in the integrated sky flux density of the radio source at 1.4 GHz, in milliJanskies (mJy). The original units for this parameter in the reference paper were uJy. The HEASARC converted them to mJy to conform to its standard unit for radio flux densities.
This parameter is set to '<' if the corresponding deconvolved best-fit Gaussian major axis is an upper limit.
The deconvolved (FWHM) major axis of the best Gaussian fit to the major axis of the radio source, in arcseconds.
The Signal-to-Noise (S/N) ratio of the detection calculated from Sp/sigma, where Sp is the peak flux density as measured in either the 2", 3.5" or 6" image and sigma equals the rms noise in that image.