EVN User Experiment Pipeline Feedback

Last updated: Fri Jul 17 12:27:05 CEST 2009 muehle@jive.nl

General Comments. ( Brief data summary and scan listing )
This is the continuum pass of EM064D (8 bands, 2 pols, each with 128 frequency points).
C band (5cm) line and continuum phase-referencing experiment, observed on 11 March 2009. The data rate was 128 Mbps (16 x 2 MHz subbands, dual polarization, two-bit sampling). The target source 'I20126' was calibrated using the phase-reference source 'J2007+4029'. 'J2005+7752' was observed as fringe finder and calibrator. In this pipeline reduction, Ef served as reference antenna and as plot reference, i.e. the plots show baselines to Ef.
8 EVN stations participated in this experiment: Cm, Ef, Jb (MkII), Mc, Nt, On, Tr, and Wb (single dish). Due to the limitations of the microwave link, not all subbands of Cm were recorded. Ef was out for a pointing check at 06:17-06:29 UT and had to do a full Az turn at 07:50-08:05 UT after having reached its Az limits. At Jb, the MkII telescope was used for these observations. Mc reported that the IF2 channel had less power than nominal. At Nt, the elevation of the sources was beyond the upper limit of the telescope at 07:40-08:10 UT. As usual at this frequency, a single antenna was used at Wb.

The EVN reliability indicator (ERI) for this experiment was ERI = 1.0 . ERI* = 1.0 . (Cm=1, Ef=1, Jb=1, Mc=1, Nt=1, On=1, Tr=1, Wb=1)

Plots of the autocorrelations
Comments.
Cm: valid data in subbands 0-4; some low-level RFI at Ef, Wb, Jb, Tr; noisy bandpasses/spikes in Mc/IF3/RR (before 08:00 UT), Nt/IF2+3/RR, Wb/IF7+8/LL, Tr/IF3-6/LL; 210 pages

plots of the uncalibrated amplitude and phase against time
Comments.
Ef-Tr: amplitude decreases in all IFs at ~07:50-08:40 UT => small-scale structure?; Ef-On: some variation in amplitude => small-scale structure?; 32 pages

Plots of the uncalibrated amplitude and phase against frequency channel
Comments.
looking good: stable bandpasses, phases can be followed in the calibrators; 194 pages

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

TSYS against time
Comments.
Cm: T_sys=1 (microwave link); Wb: small jump in all subbands at ~08:30 UT; Jb: RCP channels show brief disturbance at ~05:30 UT, LCP channels at ~07:15 UT; On: small jump at ~08:30 UT in all subbands; Mc: first data points in LCP channels very high (outliers) => flag?; Nt: T_sys of IF1/RCP differs from T_sys of other subbands; Tr: lots of scatter at ~07:55-08:30 UT; 13 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.
nothing unusual deteced; 13 pages

Fringe-fit phase solutions (including Parallactic Angle correction).
Comments.
refant=Ef, drift in phases reflects the parallactic angle correction; looks ok; 13 pages

Fringe-fit delay solutions
Comments.
refant=Ef; Cm: huge delays in IF5/R+L (hundreds of nanoseconds); rest of delays of the order of (tens of) nanoseconds; 13 pages

Fringe-fit rate solutions
Comments.
refant=Ef; rates of the order of a few milliHertz; 13 pages

Telescope bandpasses
Comments.
looking good; 2 pages

Calibrated amplitude and phase against time (a priori amplitude calibration and fringe-fit solutions applied).
Comments.
Nt: IFs 5+6/LCP show significant non-zero phases in the calibrators; 32 pages

Calibrated amplitude and phase against frequency channel
Comments.
Mc: noisy phases and amplitudes in IFs 6+8/RCP in the first (two?) scan(s?); Tr: in scan # 72 and #73, only IF2/RCP and IF5/LCP present, in scan #74-82, all IFs _except_ for IF2/RCP and IF5/LCP present, noisy phases and amplitudes in IFs 1+2+5/RCP and IFs 2+4+8/LCP in scan #83; 194 pages

Naturally weighted dirty map (not useful for bright sources) produced before self-cal of:
I20126: pdf , or FITS .
J2005+7752: pdf (not available) , or FITS (not available) .
J2007+4029: pdf (not available) , or FITS (not available) .
Comments.

Uniformly weighted dirty map (not useful for bright sources) produced before self-cal of:
I20126: pdf , or FITS .
J2005+7752: pdf (not available) , or FITS (not available) .
J2007+4029: pdf (not available) , or FITS (not available) .
Comments.

Phase corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
I20126 (not available) .
J2005+7752 .
J2007+4029 .
Comments.
refant=Ef; phase corrections within a few tens of degrees; very few outliers; 13 pages per source

Amplitude corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
I20126: pdf (not available) , or text file (not available) , or statistical summary (not available) .
J2005+7752: pdf , or text file , or statistical summary .
J2007+4029: pdf , or text file , or statistical summary .
Comments.
Nt: large amplitude corrections in IF5/LCP, IF6/LCP and IF2/RCP and IF3/RCP, double-check values at 08:00-08:30 UT; Tr: double-check values at 08:00-08:30 UT; 13 pages per source

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.
nothing unexpected detected; 13 pages

Residual closure phase (visibility closure phase with model closure phase subtracted) for:
I20126 (not available) .
J2005+7752 .
J2007+4029 .
Comments.
looking ok; 12 pages per source

Calibrated visibilities and the source model of:
I20126 (not available) .
J2005+7752 .
J2007+4029 .
Comments.
generally looking very good; Nt: IFs 5+6/LCP show significant non-zero phases (see above); 32 pages per source

Calibrated visibilities against u,v distance for:
I20126: pdf , or png .
J2005+7752: pdf , or png .
J2007+4029: pdf , or png .
Comments.

u,v coverage for:
I20126: pdf , or png .
J2005+7752: pdf , or png .
J2007+4029: pdf , or png .
Comments.

Crude maps of sources:
I20126: pdf , or FITS .
J2005+7752: pdf , or FITS .
J2007+4029: pdf , or FITS .
Comments.