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J/AJ/136/580 Sixth VLBA calibrator survey: VCS6 (Petrov+, 2008)
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Beginning of ReadMe :J/AJ/136/580 Sixth VLBA calibrator survey: VCS6 (Petrov+, 2008)
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The sixth VLBA calibrator survey: VCS6.
Petrov L., Kovalev Y.Y., Fomalont E.B., Gordon D.
<Astron. J., 136, 580-585 (2008)>
=2008AJ....136..580P
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ADC_Keywords: Surveys ; Radio sources
Keywords: astrometry - catalogs - radio continuum: galaxies - surveys
Abstract:
This paper presents the sixth part of the Very Long Baseline Array
(VLBA) Calibrator Survey. It contains the positions and maps of 264
sources of which 169 were not previously observed with very long
baseline interferometry. This survey, based on two 24h VLBA observing
sessions, was focused on (1) improving positions of 95 sources from
previous VLBA Calibrator Surveys that were observed either with very
large a priori position errors or were observed not long enough to get
reliable positions and (2) observing remaining new flat-spectrum
sources with predicted correlated flux density in the range 100-200mJy
that were not observed in previous surveys. Source positions were
derived from astrometric analysis of group delays determined at the
2.3 and 8.6GHz frequency bands using the Calc/Solve software package.
The VCS6 catalog of source positions, plots of correlated flux density
versus projected baseline length, contour plots and fits files of
naturally weighted CLEAN images, as well as calibrated visibility
function files, are available on the Web at
http://vlbi.gsfc.nasa.gov/vcs6.
Description:
Observations were performed in two 24h sessions with the VLBA on 2006
December 18 and 2007 January 11. The target sources were observed in a
sequence designed to minimize loss of time from antenna slewing. In
addition to these objects, observations of 3-4 strong sources from a
list of 62 tropospheric calibrators were made every 1-1.5h during the
sessions.