EVN Network Monitoring Experiment (NME) Pipeline Feedback


Pipeline feedback for experiment N09Q2. 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 Feb 2 16:47:08 CET 2010 muehle@jive.nl

General Comments. ( Brief data summary and scan listing )
Q band network monitoring experiment (NME) observed on 12 November 2009. The data rate was 256 Mbps (8 x 8 MHz subbands, LCP, two-bit sampling). The experiment consisted of long scans on the VLBA fringe finders '3C84' and '3C273'. The SiO maser source 'TXCAM' was observed to provide additional real-time diagnostics to the stations during the observations. '3C84' served as fringe finder. In the pipeline, Eb was the reference antenna (On, when Eb not available) and solint was set to 0.5 min.
3 stations participated: Eb, On, Nt. Nt lost the first scan due to Mk5 problems. As a consequence, the processed data set starts with scan #2.

The EVN reliability indicator (ERI) for this experiment was ERI = 0.98 . ERI* = 0.98 . (EF=1, ON=1, NT=0.98)

Plots of the autocorrelations
Comments.
stable bandpasses; maser line in IF2; 15 pages

plots of the uncalibrated amplitude and phase against time
Comments.
as expected, very fast phases; both fringe finders probably extended sources (over time, fluctuations in amplitude); 8 pages

Plots of the uncalibrated amplitude and phase against frequency channel
Comments.
even uncalibrated, phases look very good for the fringe finders; maser line in IF2; 15 pages

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

TSYS against time
Comments.
increase of system temperature with decreasing source elevation nicely tracable: 3C84 setting, below ~30 degrees elevation at Nt after ~04 UT, 3C273 rising, below ~30 degrees evelation at Eb and On before ~06 UT and ~07 UT, respectively; 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 = Eb, drift in phases reflects the parallactic angle correction; as expected, very fast phases; not surprisingly, no solutions for the maser source TX Cam; 3 pages

Fringe-fit delay solutions
Comments.
refant = Eb; delays of the order of (a few tens of) nanoseconds; 3 pages

Fringe-fit rate solutions
Comments.
refant = Eb; rates of the order of (a few tens of) mHz; a few outliers; 3 pages

Telescope bandpasses
Comments.
refant = Eb; amplitudes and phases well aligned; phases: significant deviations from zero only at the edges of a few bandpasses; 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 still noisier than those at lower frequencies; noise increases at low source elevations; no data on TX Cam (see above); 8 pages

Calibrated amplitude and phase against frequency channel
Comments.
phases in general well constrained for the fringe finders; over time, some fluctuation in amplitude (extended sources); no data on TX Cam (see above); 13 pages

Naturally weighted dirty map (not useful for bright sources) produced before self-cal of:
3C273: pdf (not available) , or FITS (not available) .
3C84: pdf (not available) , or FITS (not available) .
Comments.

Uniformly weighted dirty map (not useful for bright sources) produced before self-cal of:
3C273: pdf (not available) , or FITS (not available) .
3C84: pdf (not available) , or FITS (not available) .
Comments.

Phase corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
3C273 .
3C84 .
Comments.
refant = Eb; phase corrections mostly within a few tens of degrees; 3 pages per source

Amplitude corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
3C273: pdf (not available) , or text file (not available) , or statistical summary (not available) .
3C84: pdf (not available) , or text file (not available) , or statistical summary (not available) .
Comments.
no amplitude self-calibration (only 3 stations)

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 (only 3 stations)

Residual closure phase (visibility closure phase with model closure phase subtracted) for:
3C273 .
3C84 .
Comments.
small residual closure phases; 1 page per source

Calibrated visibilities and the source model of:
3C273 .
3C84 .
Comments.
even without self-calibration of the amplitude, very good agreement between data and models; 8 pages per source

Calibrated visibilities against u,v distance for:
3C273: pdf , or png .
3C84: pdf , or png .
Comments.

u,v coverage for:
3C273: pdf , or png .
3C84: pdf , or png .
Comments.

Crude maps of sources:
3C273: pdf , or FITS .
3C84: pdf , or FITS .
Comments.
both fringe finders detected