VLBA Calibrator Survey 5 (VCS5)
Summary
Here the fifth extension to the Very Long Baseline Array
(VLBA) Calibrator Survey, containing 569 new sources not previously
observed with very long baseline interferometry (VLBI) is presented.
The main goal of this campaign is to observe additional sources
supplementing previous survey results to construct a statistically
complete sample of extragalactic flat-spectrum radio sources.
This VCS extension, based on three 24 hour VLBA observing sessions,
detected almost all remaining extragalactic flat-spectrum sources
with correlated flux density greater than 200 mJy at 8.6 GHz above
declination -30°. It also increases the number of known sources
suitable as phase calibrators. Source positions with milliarcsecond
accuracy were derived from astrometric analysis of ionosphere free
combinations of group delays determined at 2.3 and 8.6 GHz frequency bands.
The VCS5 catalogue of source positions, plots of correlated flux density
versus the length of projected baseline, contour plots and fits files of
naturally weighted CLEAN images as well as calibrated visibility function
files are available at this page.
Publication:
Y.Y. Kovalev, L. Petrov, E. Fomalont, D. Gordon "The Fourth
VLBA Calibrator Survey - VCS5", Astronomical Journal, 2007, Vol. 133,
pp. 1236-1242.
Preprint: astro-ph/0607524
Full text (PS + gzip, 134Kb )
PDF-file.
Observations
There were three observing sessions, each 24 hour long:
VCS5a, VCS5b and VCS5c:
VCS5a was observed from 2005.07.08_19:41 till 2005.07.09_19:30
VCS5b was observed from 2005.07.09_20:33 till 2005.07.10_20:34
VCS5c was observed from 2007.07.20_23:13 till 2005.07.21_23:10
| Date |
Experiment |
Session |
URL for downloading |
Size (bytes) |
| 2005.07.08 |
vcs5a |
$05JUL08XV |
ftp://cddis.gsfc.nasa.gov/vlbi/raw/fits/2005_07_08_vcs5a_fits.tar.bz2 |
10,402,147,383 |
| 2005.07.09 |
vcs5b |
$05JUL09XV |
ftp://cddis.gsfc.nasa.gov/vlbi/raw/fits/2005_07_09_vcs5b_fits.tar.bz2 |
10,820,635,915 |
2005.07.20 |
vcs5c |
$05JUL20XV |
ftp://cddis.gsfc.nasa.gov/vlbi/raw/fits/2005_07_20_vcs5c_fits.tar.bz2 |
10,292,185,078 |
Results
-
VCS5 catalogue in HTML form.
The catalogue contains positions os 590 targeted sources, their
uncertainties, estimates of the total VLBA flux density, the
VLBA flux density of unresolved components, naturally weighted CLEAN
images in postscript and in fits format at X and S-band; plots of the
correlated flux density as a function of the length of the baseline
projection to the source plane; fits files with calibrated
uv data.
-
VCS5 catalogue in ASCII format.
The catalogue contains source positions, their uncertainties,
total VLBA flux density, the VLBA flux density of unresolved
components.
-
Catalogue in HTML form
of 70 sources used as
tropospheric
calibrators. The catalogue contains source positions, their
uncertainties, estimates of the total VLBA flux density, the VLBA
flux density of unresolved components, naturally weighted CLEAN
images in postscript and in fits format at X and S-band; plots of
the correlated flux density as a function of the length of the
baseline projection to the source plane; fits files with calibrated
uv data.
-
Catalogue in ASCII format
of 70 sources used as tropospheric calibrators.
-
All images and uv data
in one tar.bz2 file (422Mb). Refer to
the readme file
for the file name convention in this archive.
569 new sources and 21 previusly observed sources of 675 targets have
been detected. Among them, 433 are suitable as calibrators
(more than 8 X/S good observations, semi-major error ellipse is less
than 25 nrad (5 mas)).
Back to VLBA Calibrator Survey web page.
NOTE: Content from this Web site
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permission from authors.
Last update: 28-JUL-2006 15:18:13
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