EVN User Experiment Pipeline Feedback


Pipeline feedback for experiment EB025. If you have any comments on this experiment please email the address below.
A detailed description of the pipeline output is available.

Last updated: Thu May 27 11:08:44 CEST 2004 biggs@jive.nl

General Comments. ( Brief data summary and scan listing )
This is an EVN-only imaging experiment at 21cm (dual polarisation, 4 IFs). Particpating stations were Jb (Lovell), Cm, Wb, Ef, On, Mc, Nt, Tr and Ur. The reference antenna for calibration and plotting was Ef. The EVN reliability indicator was ERI=0.62 (Jb=1.00, Cm=0.25, Wb=0.5, Ef=0.94, On=0.92, Mc=0.92, Nt=1.00, Tr=1.00, Ur=0.65). ERI gives you an estimate of the ratio of observed/good visibilities to the expected number. ERI* is the same, but excludes data lost due to circumstances out of the EVN's control e.g. bad weather (ERI*=0.62).

Plots of the autocorrelations .
Comments.
Wb: upper two IFs flagged.
Cm: IF4 flagged as well as bottom half of IF1 and upper half of IF3. IF1 (RR) is dead.
Ur: Data appear okay, but see next section.

Plots of the uncalibrated amplitude and phase against time .
Comments.
Ef: 3 scans towards beginning of experiment are dead.
On: no data for ~hour in last half of experiment.
Ur: IF3, LL is completely dead and IFs 1 and 2 have very little useable data in RR.
Mc: at least two gaps in the data are visible.

Plots of the uncalibrated amplitude and phase against frequency channel .
Comments.
None.

The uncalibrated amplitude and phase of the crosshand correlations against frequency channel (not available) .
Comments.
n/a.

TSYS against time .
Comments.
RFI is probably effecting some IFs of Jb, Mc and Tr.
Cm: no Tsys available.
On: upper and lower points should probably be flagged.

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 telescopes have predicted sensitivity as given in the EVN Status Table) apart from On where the measured SEFD is about 50% too high.
However, trend in gain for Nt and Tr does not look right and does not reflect the variation in Tsys. Whilst the lowest value of SEFD for Nt agrees with the status table that for Tr is way too high for most of the time.
Cm: value is predicted sensitivity.

Fringe-fit phase solutions (including Parallactic Angle correction).
Comments.
Phase variation is generally pretty placid.
Cm: no solutions in IFs 1 and very few in IF3. Only the strongest sources in general survive.
Ef: variation reflects parallactic angle.

Fringe-fit delay solutions .
Comments.
None.

Fringe-fit rate solutions .
Comments.
Only pbvious spurious solutions effect Tr IF3R and seem to correspond to the times of RFI-affected Tsys.

Telescope bandpasses .
Comments.
None.

Calibrated amplitude and phase against time (a priori amplitude calibration and fringe-fit solutions applied).
Comments.
Not all bad data is flagged by FRING.

Calibrated amplitude and phase against frequency channel .
Comments.
None.

Naturally weighted dirty map produced before self-cal of:
3C286 .
3C454.3 .
DA193 .
J0132+4325 .
J0154+4743 .
OQ208 .
Comments.
None.

Uniformly weighted dirty map produced before self-cal of:
3C286 .
3C454.3 .
DA193 .
J0132+4325 .
J0154+4743 .
OQ208 .
Comments.
None.

Phase corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
3C286.
3C454.3.
DA193.
J0132+4325.
J0154+4743.
OQ208.
Comments.
None.

Amplitude corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
3C286: postscript , or text file .
3C454.3: postscript , or text file .
DA193: postscript , or text file .
J0132+4325: postscript , or text file .
J0154+4743: postscript , or text file .
OQ208: postscript , or text file .
Comments.
Every telescope for which there is Tsys and no obvious problems with the calibration are very well calibrated (to about 5%).
Cm: solutions favour a higher sensitivity for this telescope than used for calibration.
Nt, Tr: solutions are trying to correct for the incorrect amplitude calibration.

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.
None.

Residual closure phase (visibility closure phase with model closure phase subtracted) for:
3C286 .
3C454.3 .
DA193 .
J0132+4325 .
J0154+4743 .
OQ208 .
Comments.
None.

Calibrated visibilities and the source model of:
3C286 .
3C454.3 .
DA193 .
J0132+4325 .
J0154+4743 .
OQ208 .
Comments.
None.

Calibrated visibilities against u,v distance for:
3C286. postscript , or png (smaller)
3C454.3. postscript , or png (smaller)
DA193. postscript , or png (smaller)
J0132+4325. postscript , or png (smaller)
J0154+4743. postscript , or png (smaller)
OQ208. postscript , or png (smaller)
Comments.
None.

u,v coverage for:
3C286. postscript , or png (smaller)
3C454.3. postscript , or png (smaller)
DA193. postscript , or png (smaller)
J0132+4325. postscript , or png (smaller)
J0154+4743. postscript , or png (smaller)
OQ208. postscript , or png (smaller)
Comments.
None.

Crude map of 3C286 from the pipeline .
Crude map of 3C454.3 from the pipeline .
Crude map of DA193 from the pipeline .
Crude map of J0132+4325 from the pipeline .
Crude map of J0154+4743 from the pipeline .
Crude map of OQ208 from the pipeline .
Comments.
Source is detected at the centre of each map. J0154+4743 in particular may have a second component.