EVN User Experiment Pipeline Feedback


Pipeline feedback for experiment EA041_1. If you have any comments on this experiment please email the address below.
A detailed description of the pipeline output is available.

Last updated: Mon Oct 11 14:31:21 CEST 2010 muehle@jive.nl

General Comments. ( Brief data summary and scan listing )
Pass 1: Doppler1 (vel = -24.5 km/s)
K band spectral line EVN experiment, observed on 27 October 2009. The data rate was 64 Mbps (1 x 8 MHz subband, dual polarization, two-bit sampling). The data were postprocessed and pipelined in three passes, with doppler source velocities of -24.5 km/s, +60.1 km/s and -58.0 km/s, respectively. In this pass, the target source 'IRAS17230+01' was calibrated using the calibrator source '3C345'. The calibrator source '3C454.3' was the fringe finder. In this pipeline reduction, Ef served as reference antenna and as plot reference, i.e. except for the autocorrelations, the plots show baselines to Ef.
8 EVN stations were scheduled in this experiment: Cm, Ef, Jb, Mc, Mh, Nt, On, and Ys. Mc reported a fault in the patch panel configuration until 19:00 UT, making scan #46 the first valid scan. The recorded data show an unusually low fraction of high bits in particular in the RCP channel, resulting in a reduced sensitivity, but fortunately not a complete loss of the data before 19:00 UT. The microwave link to Cm was unstable. At Mh, there were rain showers from 16:00 UT. More details about the observations and the data can be found in the letter to the P.I. which is also available from the archive (section "Standardplots").

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

Plots of the autocorrelations
Comments.
stable bandpasses; a few very narrow spikes; 24 pages

plots of the uncalibrated amplitude and phase against time
Comments.
except for Cm (very noisy) and the last scan, phases of the calibrator source can be followed even in the uncalibrated data; a check with a different reference antenna shows that the last scan is bad only at Ef: amplitude repeatedly drops to almost zero, accompagnied by phase jumps; 4 pages

Plots of the uncalibrated amplitude and phase against frequency channel
Comments.
phases can be followed in the calibrator; stable amplitudes; Cm becoming noisier with time; 24 pages

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

TSYS against time
Comments.
looks reasonable; 2 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.
curves match closely those of T_sys vs. time; 2 pages

Fringe-fit phase solutions (including Parallactic Angle correction).
Comments.
reference antenna: Ef, drift in phases reflects the parallactic angle correction; Cm: strongly variable solutions; essentially only solutions for the calibrator source found by the pipeline; 2 pages

Fringe-fit delay solutions
Comments.
reference antenna: Ef; delays of the order of a few tens of nanoseconds ( < 20 nsec); 2 pages

Fringe-fit rate solutions
Comments.
reference antenna: Ef; rates of the order of a few mHz; bigger for Cm and the last scan; 2 pages

Telescope bandpasses
Comments.
reference antenna: Ef; bandpasses look good; phases flat and close to zero except for the edges of the bandpasses of Cm, Nt, Ys and Mh; 2 pages

Calibrated amplitude and phase against time (a priori amplitude calibration and fringe-fit solutions applied).
Comments.
except for the last scan, phases of calibrator source close to zero; amplitudes look reasonable; Cm: noisy phases; after fringe fitting, essentially only the calibrator source remains; 4 pages

Calibrated amplitude and phase against frequency channel
Comments.
phases of the calibrator close to zero; amplitudes look reasonable; 14 pages

Naturally weighted dirty map (not useful for bright sources) produced before self-cal of:
3C345: pdf (not available) , or FITS (not available) .
Comments.

Uniformly weighted dirty map (not useful for bright sources) produced before self-cal of:
3C345: pdf (not available) , or FITS (not available) .
Comments.

Phase corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
3C345 .
Comments.
refant: Ef; phase corrections in general within a couple of degrees (for the calibrator), larger for Cm; 2 pages

Amplitude corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
3C345: pdf , or text file , or statistical summary .
Comments.
Cm: high gain values (~2) with large variations; On: gains at about 0.7 (see also N09K3); 2 pages

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.
some outliers at start of scans; 2 pages

Residual closure phase (visibility closure phase with model closure phase subtracted) for:
3C345 .
Comments.
closure phases clustered around zero; not surprisingly, plots including Cm are noisier than the others; 12 pages

Calibrated visibilities and the source model of:
3C345 .
Comments.
very good agreement between data and models; 4 pages

Calibrated visibilities against u,v distance for:
3C345: pdf , or png .
Comments.

u,v coverage for:
3C345: pdf , or png .
Comments.

Crude maps of sources:
3C345: pdf , or FITS .
Comments.