EVN User Experiment Pipeline Feedback


Pipeline feedback for experiment N09Q1. If you have any comments on this experiment please email the address below.
A detailed description of the pipeline output is available.

Last updated: Tue Apr 28 15:16:23 CEST 2009 muehle@jive.nl

General Comments. ( Brief data summary and scan listing )
Q band network monitoring experiment (NME) observed on 18 March 2009. The data rate was 256 Mbps (8 x 8 MHz subbands, dual polarization, two-bit sampling). The experiment consisted of long scans on the VLBA fringe finders '3C454.3' and '3C84'. The maser source 'TXCAM' was observed to provide additional diagnostics to the stations during the observations. '3C454.3' served as fringe finder. In the pipeline, Ef was the reference antenna (On, when Ef not available) and solint was set to 0.5 min.
3 stations participated: Ef, On, Nt. Ef skipped parts of scans 3 and 13 for pointing (= parts of scans 2 and 7 in the FITS file).

The EVN reliability indicator (ERI) for this experiment was ERI = 1.0 . ERI* = 1.0 . (EF=1, ON=1, NT=1)

Plots of the autocorrelations
Comments.
stable bandpasses; 8 pages

plots of the uncalibrated amplitude and phase against time
Comments.
as expected, very fast phases; Ef out for pointing at 15:02-15:12 UT; 8 pages

Plots of the uncalibrated amplitude and phase against frequency channel
Comments.
even uncalibrated, phases look good for the fringe finders; maser line of TX Cam in IF1; 8 pages

The uncalibrated amplitude and phase of the crosshand correlations against frequency channel
Comments.
even uncalibrated, phases look good for the fringe finders on the most sensitive baselines; 8 pages

TSYS against time
Comments.
Ef: no antabfs-file, used dummy file with T_sys set to 1; increase of system temperature with decreasing source elevation nicely tracable for 3C454.3; 3 pages

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.
very good match to T_sys vs. time (see above); 3 pages

Fringe-fit phase solutions (including Parallactic Angle correction).
Comments.
refant = Ef, drift in phases reflects the parallactic angle correction (3C84 at ~80 degrees elevation at 15:03-15:30); as expected, very fast phases; not surprisingly, no solutions for the maser source TX Cam found (13:18-13:45 UT); 3 pages

Fringe-fit delay solutions
Comments.
refant = Ef, out for pointing at 15:02-15:12 UT; delays of the order of a few tens of nanoseconds; 3 pages

Fringe-fit rate solutions
Comments.
refant = Ef, out for pointing at 15:02-15:12 UT; rates of the order of (a few tens of) mHz; 3 pages

Telescope bandpasses
Comments.
refant = Ef; amplitudes and phases well aligned; 1 page

Calibrated amplitude and phase against time (a priori amplitude calibration and fringe-fit solutions applied).
Comments.
phases straightened out nicely with the pipeline calibration process, but not surprisingly a bit noisier than those at lower frequencies; no data on TX Cam (see above); 8 pages

Calibrated amplitude and phase against frequency channel
Comments.
phases well constrained for the fringe finders; no data on TX Cam (see above); 6 pages

Naturally weighted dirty map (not useful for bright sources) produced before self-cal of:
3C84: pdf (not available) , or FITS (not available) .
3C454.3: pdf (not available) , or FITS (not available) .
Comments.

Uniformly weighted dirty map (not useful for bright sources) produced before self-cal of:
3C84: pdf (not available) , or FITS (not available) .
3C454.3: pdf (not available) , or FITS (not available) .
Comments.

Phase corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
3C84 .
3C454.3 .
Comments.
refant = Ef; phase corrections within a few degrees, few outliers; 3 pages per source

Amplitude corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
3C84: pdf (not available) , or text file (not available) , or statistical summary (not available) .
3C454.3: pdf (not available) , or text file (not available) , or statistical summary (not available) .
Comments.
no amplitude self-calibration

Telescope sensitivities (not available) (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.
no amplitude self-calibration

Residual closure phase (visibility closure phase with model closure phase subtracted) for:
3C84 .
3C454.3 .
Comments.
small residual closure phases; 1 page per source

Calibrated visibilities and the source model of:
3C84 .
3C454.3 .
Comments.
even without self-calibration of the amplitude, good agreement between data and models; 8 pages per source

Calibrated visibilities against u,v distance for:
3C84: pdf , or png .
3C454.3: pdf , or png .
Comments.

u,v coverage for:
3C84: pdf , or png .
3C454.3: pdf , or png .
Comments.

Crude maps of sources:
3C84: pdf , or FITS .
3C454.3: pdf , or FITS .
Comments.
both fringe finders detected