EVN User Experiment Pipeline Feedback


Pipeline feedback for experiment EP046B. 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 Oct 21 09:50:43 CEST 2004 zparagi@jive.nl

General Comments. ( Brief data summary and scan listing )
UHF spectral line experiment recorded at 64 Mbps (2*4MHz IFs, two polarizations, two bit sampling). The array consisted of Onsala, Westerbork, Effelsberg, Noto, Torun and Urumqi. The observing frequency was ~865 MHz. Recorded on disks, except in Torun and Urumqi.

Urumqi produced no fringes in the UHF session. Torun recorded two linear polarizations, Noto a single linear polarization. The others recorded circular polarization. Severe RFI was reported from Nt.

The fringe finders were 3C345 and 4C39.25. J1335+4542 was a phase calibrator nearby the target. The pipeline had to be modified to allow lower SNR (>5) solutions in FRING since J1335+4542 seemed to be too faint. Note that the stations have lower sensitivity in this band. Many failed solution were due to the low SNR of the signal, and so the ERI below could not be well estimated.

The estimated ERI (ratio of the number of good visibilities to the expected number of visibilities) is 0.63. The known losses were all due to technical failures. The individual stations contribute to these losses as the following (1 meaning perfect data all the time): Ef - 1.00, Ur - 0.00, Wb - 0.98, On - 1.00, Tr - 1.00, Nt - 0.50/0.50 (a single receiver)

Plots of the autocorrelations .
Comments.
All stations show some RFI. Nt, Ef and On sometimes had severe RFI.

Plots of the uncalibrated amplitude and phase against time .
Comments.
Only the calibrator data are shown

Plots of the uncalibrated amplitude and phase against frequency channel .
Comments.
Nt, On, Ef: RFI is sneaking through cross-hands data
Wb: IF1 has strong band-edge cutoffs (see station feedback on the tied arrray)

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

TSYS against time .
Comments.
The Tsys measurements may be corrupted due to the RFI situation in this band.

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.
Tr seems to be more sensitive than expected (SEFD=2000 Jy, see the EVN Status Table). There was a new receiver installed before the EVN session.
Nt: also had a new receiver with previously unknown gain

Fringe-fit phase solutions (including Parallactic Angle correction).
Comments.

Fringe-fit delay solutions .
Comments.

Fringe-fit rate solutions .
Comments.

Telescope bandpasses .
Comments.

Calibrated amplitude and phase against time (a priori amplitude calibration and fringe-fit solutions applied).
Comments.
Solutions failed for Tr, On, and Nt. The reference source was a bit faint. Could also be due to RFI.

Calibrated amplitude and phase against frequency channel .
Comments.

Naturally weighted dirty map produced before self-cal of:
3C345: postscript , or FITS .
J1335+4542: postscript , or FITS .
Comments.

Uniformly weighted dirty map produced before self-cal of:
3C345: postscript , or FITS .
J1335+4542: postscript , or FITS .
Comments.

Phase corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
3C345.
J1335+4542.
Comments.

Amplitude corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
3C345: postscript , or text file .
J1335+4542: postscript , or text file .
Comments.

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.

Residual closure phase (visibility closure phase with model closure phase subtracted) for:
3C345 .
J1335+4542 .
Comments.

Calibrated visibilities and the source model of:
3C345 .
J1335+4542 .
Comments.

Calibrated visibilities against u,v distance for:
3C345. postscript , or png (smaller)
J1335+4542. postscript , or png (smaller)
Comments.

u,v coverage for:
3C345. postscript , or png (smaller)
J1335+4542. postscript , or png (smaller)
Comments.

3C345: postscript , or FITS .
J1335+4542: postscript , or FITS .
Comments.
4C39.25 imaging failed with the pipeline