EVN User Experiment Pipeline Feedback
Pipeline feedback for experiment GP032.
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address below.
Last updated: Sun Dec 8 19:36:10 CET 2002
imai@jive.nl
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General Comments.
(
Brief data summary and
scan listing.)
This project consists of 16 stations: Eb, Mc, On, Yb, Wb, Sh, Ur, and 9 VLBA telescopes (Mk did not observed due to bad weather). Used 8-MHz 4 band x 1 Pol. with 2-bits sampling.
16 spectral channels per IF. Eb is a reference antenna.
Eb: Not observed 10:35-14:00 due to bad weather. Some scans were down under the elevation limits of the telescopes.
ERI=0.72 (Eb=0.82, Mc=0.96, On=0.94, Yb=0.90,Wb=0.92, Sh=0.83, Ur=0.65) ERI*=0.92 (artificial errors only. Taking account into bad weather and antenna operation limit).
Plots of the autocorrelations.
Comments.
Ur: Very low amplitude in IF2.
Mc: Low amplitude in IF3.
Plots of the uncalibrated amplitude and phase against time.
Comments.
All sources are detected. Phase variation is well seen (in other word, slow phase variation during 20 hours).
Mc: Source was not detected 02:15-02:55.
Plots of the uncalibrated amplitude and phase against frequency
channel.
Comments.
All sources are well detected with small phase gradients along frequency. Found not problem.
The uncalibrated amplitude and phase of the crosshand
correlations against frequency channel.
Comments.
No data.
TSYS against time.
Comments.
Yb: Tsys suddenly increased over 300 K 13:10-14:00.
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.
The evaluation was done throughout the all passes.
Eb, Mc: About 120% of that in EVN status table.
On, Yb, Ur: Roughly consistent with that in EVN status table.
Wb: About 400% of that in EVN status table.
Sh: About 150% of that in EVN status table.
Fringe-fit phase solutions.
Comments.
No comment.
Fringe-fit delay solutions.
Comments.
Solutions are well determined.
Eb (seen in all telescopes): Delay jump occurred at 11:50. Bad solution in IF2 12:55.
Mc: Offsets of -10 nsec in average.
On: Systematic delay varioation by 100 nsec.
Yb: Offsets of -10 nsec in average.
Wb: Offsets within 5 nsec. Solutions wrap 03:00-06:10.
Sh: Systematic delay varioation by 30 nsec.
Ur: Offsets of -5 nsec in average.
Fringe-fit rate solutions.
Comments.
Eb (seen in all telescopes): Rate jump occurred at 11:50.
Mc: Offsets within 2 mHz.
On: Offsets of 10 mHz in average. Occasionally large offset jumps.
Yb, Wb: offsets within 2 mHz.
Sh: Offset varied from 0 mHz to -5 mHz during 03:00-07:00.
Ur: Offset varied from 2 mHz to -2 mHz during 03:00-05:00.
Telescope bandpasses.
Comments.
Well determined in amp. and phase. Found no problem.
Calibrated amplitude and phase against time
(a priori amplitude calibration and fringe-fit solutions applied).
Comments.
Phase drifts are mostly removed. For some sources, phase drifts and phase wrap still remain.
Calibrated amplitude and phase against frequency channel.
Comments.
Occasionally phase offsets and sometimes small phase grarients remain.
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.
Gain factors within 2.0.
Sc: Occasionally gain factors larger than 5.
Ov, Mc, On, Yb, Wb, Ur: Sometimes gain factors larger than 3.
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.
The evaluation was done throughout the all passes.
Eb, Mc: About 120% of that in EVN status table.
On, Yb: Difficult to evaluate due to huge values contaminating in the plot.
Ur: Roughly consistent with that in EVN status table.
Wb: About 400% of that in EVN status table.
Sh: About 150% of that in EVN status table.
Residual closure phase (visibility closure phase with
model closure phase subtracted) for DA193.
Residual closure phase (visibility closure phase with
model closure phase subtracted) for 0615+820.
Residual closure phase (visibility closure phase with
model closure phase subtracted) for 2002+475.
Comments.
DA193, 0615+820, 2002+475: Closure phases of roughly zero.
Calibrated visibilities and the source model of
DA193.
Calibrated visibilities and the source model of
0615+820.
Calibrated visibilities and the source model of
2002+475.
Comments.
DA193, 0615+820, 2002+475: Model are consistent with observed amplitudes and phases.
Calibrated visibilities against u,v distance for
DA193.
Calibrated visibilities against u,v distance for
0615+820.
Calibrated visibilities against u,v distance for
2002+475.
Comments.
DA193: Flux density gradually decrease with baseline length from 5 Jy to 1 Jy.
0615+820: About 0.5 Jy at 330M lambda.
2002+475: Flux density gradually decrease with baseline length from 0.7 Jy to 0.3 Jy.
u,v coverage for
DA193.
u,v coverage for
0615+820.
u,v coverage for
2002+475.
Comments.
DA193: Elongated in the east-west direction up to 320M lambda, and a concentration uniformly distributed up to 90M lambda.
0615+820: Uniformly distributed up to 320Mlambda.
2002+475: Elongated in the east-west direction up to 280M lambda.
Crude map of DA193 from the pipeline.
Crude map of 0615+820 from the pipeline.
Crude map of 2002+475 from the pipeline.
Comments.
DA193, 0615+820, 2002+475: An partially resolved component.