J/AJ/129/1163         Third VLBA calibrator survey: VCS3         (Petrov+, 2005)
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Beginning of ReadMe : J/AJ/129/1163 Third VLBA calibrator survey: VCS3 (Petrov+, 2005) ================================================================================ The third VLBA calibrator survey: VCS3. Petrov L., Kovalev Y.Y., Fomalont E., Gordon D. <Astron. J., 129, 1163-1170 (2005)> =2005AJ....129.1163P ================================================================================ ADC_Keywords: Radio sources ; Surveys ; Positional data Keywords: astrometry - catalogs - quasars: general - radio continuum: general - reference systems - techniques: interferometric Abstract: We present the third extension to the Very Long Baseline Array (VLBA) Calibrator Survey, containing 360 new sources not previously observed with Very Long Baseline Interferometry (VLBI). The survey, based on three 24 hour VLBA observing sessions, fills the areas on the sky above declination -45deg where the calibrator density is less than one source within a 4deg radius disk at any given direction. The positions were derived from astrometric analysis of the group delays determined at 2.3 and 8.6GHz frequency bands using the CALC/SOLVE software package. The VCS3 catalog of source positions, plots of correlated flux density versus length of projected baseline, and contour plots and FITS files of naturally weighted CLEAN images, as well as calibrated visibility function files, are available electronically from the Goddard Geodetic VLBI Group. Description: The VCS3 observations were carried out in three 24hr observing sessions with the VLBA on 2004 April 30, May 8, and May 27. The observations used the VLBA dual-frequency geodetic mode, observing simultaneously at 2.3 and 8.6GHz. Each band was separated into four intermediate-frequency channels, with bandwidth 8MHz which spanned 140MHz at 2.3GHz and 490MHz at 8.6GHz, in order to provide precise measurements of group delays for astrometric processing.