EVN User Experiment Pipeline Feedback
Last updated: Wed Nov 19 17:07:41 CET 2014
campbell@jive.nl
General Comments.
(
Brief data summary
and
scan listing
)
EP087G had 9 good stations, 8 16MHz IFs, 4 polarizations, 32 frequency points per IF/pol, and 2s integrations. Considerably more information is included in the experiment's cover letter on the standard-plots portion of the EVN Archive. This pipelining corresponds to the multiple phase-center output target ARP299D. In the pipelining, the target sources were treated as phase-reference targets and were not separately fringe-fit. The SOLINT was set automatically to a value commensurate with a typical reference-source scan. Ef, and then Wb, were used as the reference stations.
The EVN reliability indicator (ERI) for this experiment was
ERI = 0.659 . ERI* = 0.753 .
The losses include Jb missing entirely, Tr missing the first 1.5 hr, Wb missing the first 0.5hr, and Tr having 3 weak IF/pol channels (1L, 6R/L). The RFI that led to IF1 being flagged for Sv,Zc,Bd counted against ERI but not ERI*.
Plots of the autocorrelations
Comments.
Each scan plotted separately, all stations.
plots of the uncalibrated amplitude and phase
against time
Comments.
Full-experiment for Ef-* baselines, no calibration applied. A 1.75 minute plot-averaging was used.
Plots of the uncalibrated amplitude and phase
against frequency channel
Comments.
Scalar averaged Ef-* baselines, each scan plotted separately. No calibration applied yet.
The uncalibrated amplitude and phase of the crosshand
correlations against frequency channel
Comments.
Scalar averaged Ef-* baselines showing LR, each scan plotted separately. No calibration applied yet.
TSYS against time
Comments.
TY1 table, each IF/pol on a separate plot. Tr IF6/R had much higher Tsys than its other channels. A couple big spikes in Wb Tsys in the lower IFs around 14:30 & 16:00 (periods likely Iridium-related; baselines to western European stations show amplitude fades around this time).
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.
Gain amplitude from CL2 table.
Fringe-fit phase solutions
(including Parallactic
Angle correction).
Comments.
CL3 station phase solutions -- CL3 = CL2+SN2, thus also includes the initial amplitude/parallactic angle calibration from CL2 and the fringe solutions from SN2.
Fringe-fit delay solutions
Comments.
SN2 station delay solutions for the fringed sources, each IF/pol on a separate plot. Wb starts with a very different delay in IF1, and has one solint with a noticeably different delay in all IFs right before it resynch's its backend. An outlier in Tr IF4/R.
Fringe-fit rate solutions
Comments.
SN2 station rate solutions. A few outliers that have carry-on effects in the fringe-phase plot. Outliers in Wb in several IF/pols at the same time as the last delay outlier mentioned above. Outliers in many station/IF/pol in a solint around 19:00. Outliers early for a couple Zc IF/pol channels.
Telescope bandpasses
Comments.
Bandpass table 1. 4C39.25 and J1128+5925 were used for bandpass calibration (Tr,Zc had no scans on 4C39.25).
Calibrated amplitude and phase against time
(a
priori amplitude calibration and fringe-fit solutions applied).
Comments.
Full-experiment for Ef-* baselines, calibrated with CL3. The 1.75-min plot-averaging still applied.
Calibrated amplitude and phase against frequency
channel
Comments.
Ef-* baselines calibrated with CL3 and BP1. The amp and phase plots self-scale, not necessarily going down to 0 in the case of the amps.
Naturally weighted dirty map (not useful for bright sources)
produced before self-cal of:
J1128+5925: pdf (not available)
, or
FITS (not available)
.
ARP299D:
pdf
, or
FITS
.
4C39.25: pdf (not available)
, or
FITS (not available)
.
Comments.
Naturally-weighted dirty maps of the phase-referenced-to sources.
Uniformly weighted dirty map (not useful for bright sources)
produced before self-cal of:
J1128+5925: pdf (not available)
, or
FITS (not available)
.
ARP299D:
pdf
, or
FITS
.
4C39.25: pdf (not available)
, or
FITS (not available)
.
Comments.
Uniformly-weighted dirty maps of the phase-referenced-to sources.
Phase corrections applied to a priori calibrated and
fringe-fitted data by self-calibration.
J1128+5925
.
ARP299D (not available)
.
4C39.25
.
Comments.
Plots of post-SPLIT tables SN1 for the sources that have been individually fringed.
Amplitude corrections applied to a priori calibrated and
fringe-fitted data by self-calibration.
J1128+5925:
pdf
, or
text file
, or
statistical summary
.
ARP299D: pdf (not available)
, or
text file (not available)
, or
statistical summary (not available)
.
4C39.25:
pdf
, or
text file
, or
statistical summary
.
Comments.
As above, but for the post-SPLIT table SN2.
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.
CL4 gain-amp.
Residual closure phase (visibility closure phase with model closure phase subtracted) for:
J1128+5925
.
ARP299D (not available)
.
4C39.25
.
Comments.
Separate files per (fringed) source, showing closure phase plots for all the triangles. Only stokes=I shown.
Calibrated visibilities and the source model of:
J1128+5925
.
ARP299D (not available)
.
4C39.25
.
Comments.
For each (fringed) source, plots of amp/phase on Ef-* baselines, calibrated with (post-SPLIT) table CL3, with a model-line overplotted.
Calibrated visibilities against u,v distance for:
J1128+5925:
pdf
, or
png
.
ARP299D:
pdf
, or
png
.
4C39.25:
pdf
, or
png
.
Comments.
For each source, a plot of amp vs. |uv| distance. The target shows a seemingly spuriously high amplitude at the longest baselines.
u,v coverage for:
J1128+5925:
pdf
, or
png
.
ARP299D:
pdf
, or
png
.
4C39.25:
pdf
, or
png
.
Comments.
For each source, a plot of the u-v coverage.
Crude maps of sources:
J1128+5925:
pdf
, or
FITS
.
ARP299D:
pdf
, or
FITS
.
4C39.25:
pdf
, or
FITS
.
Comments.
For each source, a CLEAN map resulting from the automated fringing and self-cal iterations (or phase-referencing) in the pipeline script.