EVN User Experiment Pipeline Feedback
Pipeline feedback for experiment EM043C.
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address below.
Last updated: Wed Aug 14 11:40:31 CEST 2002
reynolds@jive.nl
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General Comments.
(
Brief data summary and
scan listing.)
This project consists of 9 stations: Ef, Wb, Yb, Ma, Wz, On, Mc, Ur, Sh (Nt not observed). Used 8-MHz 4 bands x 1 Pol. (RCP) with 2-bits sampling.
Ef is a reference antenna.
Data in IF1-3 were available in Ma. Sh and Ur observed for 70% and 35% of the allocated time range because of source elevation limits.
ERI=0.73 (Ef=1.00, Wb=1.00, Yb=1.00, Ma=0.75, Wz=1.00, On=1.00, Mc=1.00, Ur=0.68, Sh=0.30), ERI*=0.73 (artificial errors only).
Plots of the autocorrelations.
Comments.
Wz: Low amplitude in IF4.
Mc: Low amplitude in IF3.
Ur: Low amplitude in IF2.
Plots of the uncalibrated amplitude and phase against time.
Comments.
Phases were found clearly, but with large drifts with time.
Plots of the uncalibrated amplitude and phase against frequency
channel.
Comments.
Sources were detected very clearly. Small phase gradients with frequency.
The uncalibrated amplitude and phase of the crosshand
correlations against frequency channel.
Comments.
No data.
TSYS against time.
Comments.
Wb: High Tsys (~400 K).
Ma: IF4 data unavailable.
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.
Ef, Yb, On: Consistent with that in EVN status table.
Wb: 130% of that in EVN status table.
Ma: SEFD=1600-2500 Jy.
Wz: 190% of that in EVN status table.
Mc: 90-150% of that in EVN status table.
Ur: 70-100% of that in EVN status table.
Sh: 110-150% of that in EVN status table.
Fringe-fit phase solutions.
Comments.
No comment.
Fringe-fit delay solutions.
Comments.
Wb: A offset ~25 nsec in average.
Yb: Stable within 10 nsec. Wz: A offset ~7 nsec in average.
On: A offset ~8 nsec in average.
Mc: Stable within 4 nsec, but a offset ~-7 nsec in IF3 in average.
Ur: A offset ~5 nsec in average.
Sh: Offsets ~8 nsec in IF2&3, -8 nsec in IF4 in average.
Fringe-fit rate solutions.
Comments.
On: Solution wrap over 20 mHz.
Telescope bandpasses.
Comments.
Ma: Lost IF4.
Calibrated amplitude and phase against time
(a priori amplitude calibration and fringe-fit solutions applied).
Comments.
On: Still phase wrap.
Mc, Ur: Still phase wrap at a couple of times.
Calibrated amplitude and phase against frequency channel.
Comments.
Wb: Low amplitude IF1, Ma: Low amplitude IF4, Wz: Low amplitude IF4, Ur: Low amplitude IF2.
Phase corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
Comments.
No comment.
Amplitude corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
Also available as a text file.
Comments.
On: Large (>3) amplitude correction factors 1/03:15.
Mc: A huge (~400) amplitude correction factor in IF3 1/03:20.
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.
Ef, Yb, Mc, Sh: Consistent with that in EVN status table.
Wb: 230-330% of that in EVN status table.
Ma: SEFD=1230-2500 Jy.
Wz: 140-190% of that in EVN status table.
On: 100-1000% of that in EVN status table.
Ur: Unknown well because of a huge gain value contaminated. Likely consistent with that in EVN status table.
Residual closure phase (visibility closure phase with
model closure phase subtracted) for OQ208.
Residual closure phase (visibility closure phase with
model closure phase subtracted) for 0850+581.
Comments.
Occasionally closure phase wrap.
Calibrated visibilities and the source model of
OQ208.
Calibrated visibilities and the source model of
0850+581.
Comments.
For OQ208, 0850+581: Well consistent with a model in phase and amplitude, except for EF-ON baseline.
Calibrated visibilities against u,v distance for
OQ208.
Calibrated visibilities against u,v distance for
0850+581.
Comments.
For OQ208: Amplitude gradually decreses with baseline length.
For 0850+581: Amplitude is roughly constant along baseline length.
u,v coverage for
OQ208.
u,v coverage for
0850+581.
Comments.
For OQ208, 0850+581: Elongated in the right-top and left-bottom direction over 140 Mlambda.
Crude map of OQ208 from the pipeline.
Crude map of 0850+581 from the pipeline.
Comments.
For OQ208: A core partially resolved and bright sidelobs.
For 0850+581: An unresolved core and bright sidelobs.