The VLBI campaign of observing optically bright radio sources
The project of observing with VLBI 447 optically bright compact
radio sources, mainly quasars, was launched in 2006 by Patric Charlot,
Geraldine Bourda, and Richard Porcas. The strategy of this program
is described in
Bourda, G., Charlot, P., Le Campion, J.-F., 2008, AA, 490, 493.
The project had four steps:
- Detection campaign with EVN in June/October 2007
Bourda, G., Charlot, P., Porcas, R.W., Garrington, S.T.,
2010, AA, 520, 113. Of 447 observed sources, 398 were
detected, many of them very weak: 5–20 mJy.
- OBRS-1 campaign with VLBA+EVN for 48 hours in March 2008 for observing
at X and S bands of 105 brightest sources from the sample of 398
objects detected at the previous steps. Image analysis is given
Bourda, G., Collioud, A., Charlot, P., Porcas, R., Garrington, S.,
2011, AA, 526, 102B. Unfortunately, source brightness
distributions in a machine readable form are not available.
Astrometric analysis is given in paper
Petrov, L., 2011, AJ, 142, 105
The catalogue of positions of 105 sources and estimates of
their correlated flux densities at X and S bands is available
here. Because the frequency setup
was not favorable for astrometry, the position uncertainties are
- OBRS-2 campaign with VLBA+EVN for 194 hours in March 2010/March 2011
at X and S bands for observing 290 target sources detected in the
first campaign. Astrometric results are given in paper
Petrov, L., 2013, AJ, 146, 5, preprint
The catalogue in html form with source brightness distributions
in FITS-format and calibrated visibilities are available
here. The same catalogue in a plane
ascii form is available here. Because
the frequency setup was not favorable for astrometry,
the position uncertainties are large.
- OBRS-3 campaign with VLBA+EVN for 48 hours in May 2012 for
re-observing some sources in a wide-band frequency setup.
The correlator output was made publicly available in November 2015.
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This web page was prepared by Leonid Petrov
Last update: 2016.04.22_23:47:08