The Fourth VLBA Calibrator Survey - VCS4

Details The Fourth VLBA Calibrator Survey - VCS4 The Fourth VLBA Calibrator Survey - VCS4

2005-08-24

arxiv.org/abs/astro-ph/0508506v2

Astron.J.131:1872-1879,2006

Astronomy and Astrophysics

Astrophysics

8 pages, 8 figures, 3 tables, accepted for publication in the Astronomical Journal; minor changes to the text are made, table

Scientific paper

10.1086/499947

This paper presents the fourth extension to the Very Long Baseline Array (VLBA) Calibrator Survey, containing 258 new sources not previously observed with very long baseline interferometry (VLBI). This survey, based on three 24 hour VLBA observing sessions, fills remaining areas on the sky above declination -40 degrees where the calibrator density is less than one source within a 4 degree radius disk at any given direction. The share of these area was reduced from 4.6% to 1.9%. Source positions were derived from astrometric analysis of group delays determined at 2.3 and 8.6 GHz frequency bands using the Calc/Solve software package. The VCS4 catalogue 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://gemini.gsfc.nasa.gov/vcs4 .

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