EVN User Experiment Pipeline Feedback
Pipeline feedback for experiment EP037A_1.
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address below.
Last updated: Thu Jul 3 14:53:04 CEST 2003
imai@jive.nl
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General Comments.
(
Brief data summary and
scan listing.)
This project consists of 6 telescopes: Jb, Eb, Nt, On, Tr, Hh. Only LCP was valid in Hh. Very high Tsys in LCP in Eb.
There are two passes, 1st for line sources (IF1), 2nd for continuum sources (IF1-4). This page is for the 1st pass.
Used 2-MHz 1 bands x 2 pols, with 2-bits sampling. Obtained 2 pairs of polarization (LL, RR) in 2-sec integration. 1024 spectral channels per IF.
Eb is a reference antenna (Jb is a plot-reference antenna).
Phase-reference sources were not detected in each of IFs and Pols. ERI=0.11 (Jb=0.21, Eb=0.25, Nt=0.23, On=0.23, Tr=0.25, Hh=0.05, Only LCP availablity and elevation limit in Hh is taken into account. Only 25% of the data were remained after fring fittitng). ERI*=0.77 (Jb*=0.81, Eb*=1.00, Nt*=0.91, On*=0.91, Tr*=0.97, Hh*=0.26, lost scans due to the limit of antenna-slewing speeds and no detection of phase-reference continuum sources are taken into account).
Plots of the autocorrelations.
Comments.
On, Tr: A bright spur in L&Rpols.
Hh: A weak and wide spur in Lpol.
Plots of the uncalibrated amplitude and phase against time.
Comments.
Only bright calibrators, observed every 30 min, were detected.
Eb: RR had very poor sensitivity.
Nt: Data lost 19:00-19:40 in RR&LL.
On: Data lost 20:20-21:00, 21:30-23:20 in RR&LL.
Tr: Data lost 03:55-04:20.
Hh: Data lost 14:20-15:10, 15:30-15:50, 03:00-03:20 in RR&LL.
Plots of the uncalibrated amplitude and phase against frequency
channel.
Comments.
Tr: A bright spur in L&Rpols.
The uncalibrated amplitude and phase of the crosshand
correlations against frequency channel.
Comments.
No data.
TSYS against time.
Comments.
Eb: Tsys=700-900 K in Rpol, Tsys=700 K at 21:05 in Lpol.
Hh: Up to 250 K at 22:10-22:20.
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.
Jb, On: Roughly consistent with that in EVN status table.
Eb: Roughly consistent with and 600% of that in EVN status table in Lpol and Rpol, respectively.
Nt: SEFD=900-1100 Jy.
Tr: About 130% of that in EVN status table.
Hh: About 140% of that in EVN status table.
Fringe-fit phase solutions.
Comments.
Solutions were almost lost from the phase-reference calibrators.
Eb (reference): Phase slope due to parallactic angle correction.
Jb: Solutions lost 17:00-23:00 in RR.
Nt: Solutions lost 12:30-14:00 in RR&LL, 20:30-21:30 in LL.
On: Solutions lost 22:00-23:00 in RR&LL.
Hh: Solutions lost 12:30-23:00 in LL.
Fringe-fit delay solutions.
Comments.
Jb, Nt: Offset wrap within 50 nsec.
On: Systematic offset change with time within 40 nsec.
Tr: Offsets about 50 nsec in average.
Hh: Offsets about 40 nsec in average.
Fringe-fit rate solutions.
Comments.
Rate offsets within 2 mHz, sometimes up to 6 mHz.
Telescope bandpasses.
Comments.
Bandpass amplitudes and phases were determined, but channel averaging is recommended.
Calibrated amplitude and phase against time
(a priori amplitude calibration and fringe-fit solutions applied).
Comments.
Large phase drifts were reduced. Occasionally phase wrap still remains.
Calibrated amplitude and phase against frequency channel.
Comments.
Phase gradients along frequency and phase offsets were removed. Amplitude slopes still remain.
Tr: The spur still remains.
Phase corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
Comments.
Phase solutions determind in each scan of above 5 calibrators.
Naturally weighted dirty map produced before self-cal of:
J0555+3948.
J1642+3948.
J2025+3343.
J2136+0041.
J2052+3635.
Comments.
Plots for J0603+2159, J1946+2300 and J2012+4628 are unavailable.
J0555+3948: Appears over 3rd contour (0.39 Jy/beam).
J1642+3948: Fringe pattern appears over 3rd contour (1.1 Jy/beam).
J2025+3343: Appears over 2nd contour (0.14 Jy/beam).
J2136+0041: Fringe pattern appears over 2nd contour (0.83 Jy/beam).
J2052+3635: Weak fringe pattern appears over 3rd contour (0.15 Jy/beam).
Uniformly weighted dirty map produced before self-cal of:
J0555+3948.
J1642+3948.
J2025+3343.
J2136+0041.
J2052+3635.
Comments.
Plots for J0603+2159, J1946+2300 and J2012+4628 are unavailable.
J0555+3948: Appears over 2nd contour (0.60 Jy/beam).
J1642+3948: Fringe pattern appears over 3rd contour (1.8 Jy/beam).
J2025+3343: Fringe pattern appears over 3rd contour (1.9 Jy/beam).
J2136+0041: Fringe pattern appears over 2nd contour (1.7 Jy/beam).
J2052+3635: Weak fringe pattern appears over 3rd contour (0.18 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 1.5. Solutions were lost for J2052+3635.
Jb: Gain correction factors occasionally up to 3.0.
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.
Jb: 30-100% of that in EVN status table.
Eb: 70-130% of that in EVN status table.
Nt: SEFD=900-1500 Jy.
On: Roughly consistent with that in EVN status table.
Hh: About 130% of that in EVN status table.
Residual closure phase (visibility closure phase with model closure phase subtracted) for:
J0555+3948.
J1642+3948.
J2025+3343.
J2136+0041.
J2052+3635.
Comments.
Plots for only 4 sources are available (J0555+3948, J1642+3948, J2025+3343, J2136+0041).
All sources have roughly zero closure phases.
Calibrated visibilities and the source model of:
J0555+3948.
J1642+3948.
J2025+3343.
J2136+0041.
J2052+3635.
Comments.
J0555+3948: A source model consistent with observed phases, but inconsistent with observed amplitudes in LL.
J1642+3948: A source model consistent with observed phases, partially consistent with amplitudes of the model.
J2025+3343: A source model roughly consistent with observed amplitudes and phases.
J2136+0041: A source model consistent with observed phases, partially consistent with amplitudes of the model.
Calibrated visibilities against u,v distance for:
J0555+3948. postscript , png (smaller)
J1642+3948. postscript , png (smaller)
J2025+3343. postscript , png (smaller)
J2136+0041. postscript , png (smaller)
J2052+3635. postscript , png (smaller)
Comments.
J0555+3948: Roughly constant around 2.5 Jy.
J1642+3948: Roughly constant around 6 Jy, sparse distribution.
J2025+3343: Roughly constant around 0.5 Jy.
J2136+0041: About 5 Jy at 20M lambda, about 1.5 Jy at 190M lambda.
u,v coverage for:
J0555+3948
postscript, png (smaller)
J1642+3948
postscript, png (smaller)
J2025+3343
postscript, png (smaller)
J2136+0041
postscript, png (smaller)
J2052+3635
postscript, png (smaller)
Comments.
J0555+3948, J1642+3948, J2136+0041: Elongated in the north-south direction up to 180M lambda.
J2025+3343: Slightly elongated in the north-south direction up to 50M lambda.
Crude map of J0555+3948 from the pipeline.
Crude map of J1642+3948 from the pipeline.
Crude map of J2025+3343 from the pipeline.
Crude map of J2136+0041 from the pipeline.
Crude map of J2052+3635 from the pipeline.
Comments.
J0555+3948: Elongated structure in the north-south direction.
J1642+3948: An unresolved core and bright side lobes.
J2025+3343: An unresolved core and several side lobes.
J2136+0041: Emission out of the map field.