EVN User Experiment Pipeline Feedback
Pipeline feedback for experiment GK022.
If you have any comments on this experiment please email
the
address below.
Last updated: Wed Dec 18 15:10:06 MET 2002
biggs@jive.nl
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General Comments.
(
Brief data summary and
scan listing.)
This was a dual-polarisation Global VLBI experiment, observing at 8.4 GHz. EVN antennas that observed were Eb, Wb, On, Mc and Yb. Of these On and Yb could only observe in RCP. The LCP data from these antennas was flagged before fringe-fitting. Only 12 out of 14 antennas were used in the WSRT tied-array. The reference antenna was Eb for the EVN antennas, moving to VLBA:NL once the EVN antennas could no longer observe. VLBA:NL was also used as the plotting reference so as to include all the data in the plots. Note that the INDEX line for Yb in the ANTAB file is incorrect and should read INDEX= 'R1', 'L1', 'R2', 'L2'. ERI=ERI*=0.96 (Eb=1.00, Wb=1.00, On=1.00, Mc=1.00, Yb=0.93). Some data over and above this is "lost" however due to sources having set and hour angle limits at Wb.
Plots of the autocorrelations.
Comments.
No comments.
Plots of the uncalibrated amplitude and phase against time.
Comments.
LL amplitudes are at zero for Yb and On.
Plots of the uncalibrated amplitude and phase against frequency
channel.
Comments.
No comments.
The uncalibrated amplitude and phase of the crosshand
correlations against frequency channel.
Comments.
No comments.
TSYS against time.
Comments.
TPI pseudo-continuous Tsys measurements are available for all antennas apart from Yb.
VLBA:NL looks to be badly affected by precipitation, from 1/1 0 0.
Telescope sensitivities from the a priori TSYS and Gain
curves (the square of this number gives the antenna noise (SEFD) in Jy - the smaller the better).
Comments.
All VLBA antennas have approximately correct sensitivities.
Yb, Mc, On and Eb: sensitivities about right compared to EVN status table.
Wb: *SEFD* about three times what one would expect given sensitivities in EVN status table.
Fringe-fit phase solutions.
Comments.
No comments.
Fringe-fit delay solutions.
Comments.
No comments.
Fringe-fit rate solutions.
Comments.
No comments.
Telescope bandpasses.
Comments.
No comments.
Calibrated amplitude and phase against time
(a priori amplitude calibration and fringe-fit solutions applied).
Comments.
No comments.
Calibrated amplitude and phase against frequency channel.
Comments.
No comments.
Phase corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
Comments.
Phase corrections are generally small except for 2007+777, RCP. Problem with reference antenna probably (Ef).
Amplitude corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
Also available as a text file.
Comments.
Occasional spurious points, but generally very good, most corrections being around unity. Amplitude corrections for 2007+777 are curious though, covering 0.7 to 0.9, both Stokes.
Telescope sensitivities (the total AMP gain applied during
both a priori and self calibration; the square of this number gives the antenna
noise (SEFD) in Jy).
Comments.
Wb has not improved to its nominal sensitivity.
Residual closure phase (visibility closure phase with
model closure phase subtracted) for 3C84.
Residual closure phase (visibility closure phase with
model closure phase subtracted) for 2007+777.
Residual closure phase (visibility closure phase with
model closure phase subtracted) for 1156+295.
Residual closure phase (visibility closure phase with
model closure phase subtracted) for 1308+326.
Comments.
All residuals small except for 3C84.
Calibrated visibilities and the source model of
3C84.
Calibrated visibilities and the source model of
2007+777.
Calibrated visibilities and the source model of
1156+295.
Calibrated visibilities and the source model of
1308+326.
Comments.
Models approximate the data well except for 3C84 which, whilst still good, displays more obvious errors.
Calibrated visibilities against u,v distance for
3C84.
Calibrated visibilities against u,v distance for
2007+777.
Calibrated visibilities against u,v distance for
1156+295.
Calibrated visibilities against u,v distance for
1308+326.
Comments.
3C84 and 2007+777 appear much noisier than the other two because of the presence of On and Yb.
u,v coverage for
3C84.
u,v coverage for
2007+777.
u,v coverage for
1156+295.
u,v coverage for
1308+326.
Comments.
Best for 3C84.
Crude map of 3C84 from the pipeline.
Crude map of 2007+777 from the pipeline.
Crude map of 1156+295 from the pipeline.
Crude map of 1308+326 from the pipeline.
Comments.
All sources have expected structures (jet orientations) except for 1156+295, where jet structure visible in the VLBA calibrator survey is not obvious.