EVN User Experiment Pipeline Feedback
Pipeline feedback for experiment ES046.
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address below.
Last updated: Wed Apr 16 19:01:42 CEST 2003
imai@jive.nl
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General Comments.
(
Brief data summary and
scan listing.)
This project consists of 7 telescopes: Eb, Wb, Jb, On, Mc, Tr, Sh (Nt did not participate, Ur failed to produce fringes due to LO problem.)
Used 8-MHz 2 bands x 2 pols, with 2-bits sampling. Obtained full set of polarization in 4-sec integration. 16 spectral channels per IF.
Eb is a reference antenna.
ERI=0.58 (Eb=0.92, Wb=0.90, Jb=1.00, On=1.00, Mc=1.00, Tr=0.64, Sh=0.23, Ur=0.00). ERI*=0.58 (Antenna operation limit is taken into account for Eb=0.97, Wb=0.90 and Sh=0.46 (assuming fully successful operation)).
Plots of the autocorrelations.
Comments.
No comment.
Plots of the uncalibrated amplitude and phase against time.
Comments.
Calibrators were detected with phase drifts.
Eb (all baselines): No fring was found 14:35-14:45, 16:05-16:15.
Tr: Phase wrap 23:05-23:15, 23:55-24:00.
Sh: No fring was found in Rpol.
Plots of the uncalibrated amplitude and phase against frequency
channel.
Comments.
Calibrators were well detected in each of scans with small phase gradients along frequency.
The uncalibrated amplitude and phase of the crosshand
correlations against frequency channel.
Comments.
Calibrators were well detected in each of scans in LR and RL.
TSYS against time.
Comments.
Jb: Sparse data points.
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.
Eb: About 120% of that in EVN status table.
Wb: About 260% of that in EVN status table.
Jb: About 150% of that in EVN status table.
On: About 240% of that in EVN status table.
Mc: About 50% of that in EVN status table.
Tr: About 350% of that in EVN status table.
Sh: Roughly consistent with that in EVN status table.
Fringe-fit phase solutions.
Comments.
Ef (reference): Phase slope due to parallactic angle correction.
Sh: Solutions lost in RR.
Fringe-fit delay solutions.
Comments.
Wb: 24, 56, -2 and 33 nsec in IF1 RR, IF2 RR, IF1 LL, IF2 LL, respectively.
Jb: Varying within 20 nsec.
On: About 10 nsec and -3 nsec in RR, LL, respectively.
Mc: About 20 nsec and -3 nsec in RR, LL, respectively.
Tr: About 47 nsec and 5 nsec in RR, LL, respectively.
Sh: Only LL available. Varying within 20 nsec.
Fringe-fit rate solutions.
Comments.
Rate offsets within 2 mHz.
Telescope bandpasses.
Comments.
Bandpass amplitudes and phases were well determined.
Calibrated amplitude and phase against time
(a priori amplitude calibration and fringe-fit solutions applied).
Comments.
Large phase drifts were reduced, but phase offsets still remain.
Tr: No fring was found 23:05-23:15.
Calibrated amplitude and phase against frequency channel.
Comments.
Phase gradients along frequency were removed, but occasionally phase offsets remain.
Phase corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
Comments.
Phase solutions determind in each scan of the calibrators.
Naturally weighted dirty map produced before self-cal of:
3C454.3.
3C84.
1308+326.
Comments.
3C454.3: Only fringe pattern above 3nd contour (2.8 Jy/beam) due to poor u-v coverage.
3C84: Marginally detected above 2nd contour (6.8 Jy/beam).
1308+326: Appears over 3rd contour (1.0 Jy/beam).
Uniformly weighted dirty map produced before self-cal of:
3C454.3.
3C84.
1308+326.
Comments.
3C454.3: Only fringe pattern above 3nd contour (3.6 Jy/beam) due to poor u-v coverage.
3C84: Appears over 2nd contour (5.7 Jy/beam).
1308+326: Appears over 3rd contour (1.1 Jy/beam).
Amplitude corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
Also available as a text file.
Comments.
Gain correction factors usually within 1.4.
Eb: Large gain correction factors at 14:40. Solutions lost from a scan toward 3C454.3.
On: Occasionally small gain correction factors down to 0.4.
Tr: A too large gain correction factor at 23:10.
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.
Eb: 60%-120% of that in EVN status table.
Wb: 120%-200% of that in EVN status table.
Jb: About 120% of that in EVN status table.
On: About 140% of that in EVN status table.
Mc: Roughly consistent with that in EVN status table.
Tr: 100%-700% of that in EVN status table.
Sh: Roughly consistent with that in EVN status table.
Residual closure phase (visibility closure phase with model closure phase subtracted) for:
3C454.3.
3C84.
1308+326.
Comments.
3C454.3, 3C84: Systematic closure phase variation was seen within 20 degrees.
1308+326: Systematic closure phase variation was seen up to 50 degrees. Occasionally closure phase wrap.
Calibrated visibilities and the source model of:
3C454.3.
3C84.
1308+326.
Comments.
3C454.3; Phase rotation occurs aroung 06:00. The source model is consistent with the observed amplitudes and phase.
3C84: The source model is consistent with the observed amplitudes and phase.
1308+326: Phase wrap and amplitude fading during 14:40-14:45. The source model is consistent with the observed amplitudes and phase.
Calibrated visibilities against u,v distance for:
3C454.3. postscript , png (smaller)
3C84. postscript , png (smaller)
1308+326. postscript , png (smaller)
Comments.
3C454.3: About 13 Jy at 12M lambda and about 3.5 Jy at 140M lambda.
3C84: About 13 Jy at 4M lambda and about 6 Jy at 29M lambda.
1308+326: Roughly constant at about 1.2 Jy.
u,v coverage for:
3C454.3
postscript, png (smaller)
3C84
postscript, png (smaller)
1308+326
postscript, png (smaller)
Comments.
3C454.3: Slightly elongated in NW-SE direcition up to 20M lambda and two segments in the east-west direction at 125M lambda.
3C84: Uniform distribution up to 25M lambda.
1308+326: Slightly elongated in NE-SW direcition up to 20M lambda.
Crude map of 3C454.3 from the pipeline.
Crude map of 3C84 from the pipeline.
Crude map of 1308+326 from the pipeline.
Comments.
3C454.3: Unresolved true components and side lobes, which cannot be recognized separately.
3C84: A core elongated structure in the north-south direction and another component at the west of the core.
1308+326: An unresolved core and bright side lobes.