EVN User Experiment Pipeline Feedback


Pipeline feedback for experiment N11L1. If you have any comments on this experiment please email the address below.
A detailed description of the pipeline output is available.

Last updated: Fri Jun 17 14:14:39 CEST 2011 mahmud@jive.nl

General Comments. ( Brief data summary and scan listing )
L band (1.6 GHz) network monitoring experiment (NME) observed on 26 February 2011. The data rate was 512 Mbps (16 x 8 MHz subbands, dual polarization, two-bit sampling). The experiment observed three sources 0234+285, 0528+134 and DA193. 12 stations participated in the experiment: Ef, Jb, On, Mc, Tr, Wb, Zc, Bd, Sv, Sh, Ur and Hh. There were fringes to all stations. In this pipeline reduction, Ef was the reference antenna. However, Ef had unperiodic phase drops (possibly caused by the "Set 1 odd attenuator on output port not connected properly"- see station feedback.) This affected RCP in all IFs but not LCP (see standard plots for a snippet of data, however this plot only shows RR for the first two subbands). On a more detailed analysis of comparing RR vs LL maps (not included in pipeline), the RR maps were found to be noisier and oddly had a higher peak flux than the LL map ~ 15% (as examined in the case of 0234+285). However, for the bright sources observed in this experiment, the phase drops can be easily seen and edited out with AIPS task IBLED.

The EVN reliability indicator (ERI) for this experiment was ERI = 0.96 (losses include ~45 minutes Jb due to recording glitch) . ERI* = 1 .

Plots of the autocorrelations
Comments.
RFI spikes in OnIF 8, Hh IF 7, Ur IF 1 and some RFI in all IFs for Mc; jump in autocorrelations in the middle of IF 1 for On.

plots of the uncalibrated amplitude and phase against time
Comments.

Plots of the uncalibrated amplitude and phase against frequency channel
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The uncalibrated amplitude and phase of the crosshand correlations against frequency channel
Comments.
Badary IF 6, cross pols RL and LR both have a significantly different delay, which is visible in all baselines to Badary. These can be corrected with AIPS task VLBACPOL.

TSYS against time
Comments.
Noisier Tsys measurements in IF 1, Wb. High Tsys measurements in IF 7 and 8 Jb and IF 1 and 2 On. Dummy antab file used for KVASAR stations.

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.

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

Fringe-fit delay solutions
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Fringe-fit rate solutions
Comments.

Telescope bandpasses
Comments.
OK. Dip in the center of the bandpass in IF 6 Bd in RR and LL and phases for most stations in IFs 7 and 8 are oscillating

Calibrated amplitude and phase against time (a priori amplitude calibration and fringe-fit solutions applied).
Comments.
OK

Calibrated amplitude and phase against frequency channel
Comments.
Gibbs Ringing on most baselines. Noisy phases and lower amplitudes in IF 7-8, all baselines to Effelsberg. Sv IF 2 has significantly lower RR amplitudes. Zc IFs 5-6 have much lower LL amplitudes.

Naturally weighted dirty map (not useful for bright sources) produced before self-cal of:
0528+134: pdf (not available) , or FITS (not available) .
0234+285: pdf (not available) , or FITS (not available) .
DA193: pdf (not available) , or FITS (not available) .
Comments.

Uniformly weighted dirty map (not useful for bright sources) produced before self-cal of:
0528+134: pdf (not available) , or FITS (not available) .
0234+285: pdf (not available) , or FITS (not available) .
DA193: pdf (not available) , or FITS (not available) .
Comments.

Phase corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
0528+134 .
0234+285 .
DA193 .
Comments.

Amplitude corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
0528+134: pdf , or text file , or statistical summary .
0234+285: pdf , or text file , or statistical summary .
DA193: pdf , or text file , or statistical summary .
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:
0528+134 .
0234+285 .
DA193 .
Comments.

Calibrated visibilities and the source model of:
0528+134 .
0234+285 .
DA193 .
Comments.

Calibrated visibilities against u,v distance for:
0528+134: pdf , or png .
0234+285: pdf , or png .
DA193: pdf , or png .
Comments.

u,v coverage for:
0528+134: pdf , or png .
0234+285: pdf , or png .
DA193: pdf , or png .
Comments.

Crude maps of sources:
0528+134: pdf , or FITS .
0234+285: pdf , or FITS .
DA193: pdf , or FITS .
Comments.