EVLA Wide-Band Wide-Field Imaging: G55.7 3.4: Difference between revisions

Revision as of 16:55, 25 August 2011

Overview

This CASA Guide describes the imaging of the supernova remnant G55.7+3.4.. The data were taken on August 23, 2010, in the first D-configuration for which the new wide-band capabilities of the WIDAR correlator were available. The 8-hour-long observation includes all available 1 GHz of bandwidth in L-band, from 1-2 GHz in frequency.

The data have also been flagged and calibrated, and the corrected data for G55.7+3.4 have been split off to

Preliminary data evaluation

plotms, plotants, viewer (?)

A priori calibration and flagging

Antenna position correction

Flagging non-operational antennas

Automatic RFI excision

Hanning-smoothing data

Using phase calibration source for preliminary bandpass calibration

Running testautoflag

Evaluating results & manual flagging

Flagging lowest edge of SPW 0 ...

Calibrating data

Clearing previous calibration

Setting flux scale

@@ Line 8: / Line 8: @@
 == Overview ==
-This CASA Guide describes the flagging, calibration, and imaging of the supernova remnant [http://simbad.u-strasbg.fr/simbad/sim-id?Ident=G55.7+3.4&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id G55.7+3.4.].  The data were taken on August 23, 2010, in the first D-configuration for which the new wide-band capabilities of the WIDAR correlator were available.  The 8-hour-long observation includes all available 1 GHz of bandwidth in L-band, from 1-2 GHz in frequency.
+This CASA Guide describes the imaging of the supernova remnant [http://simbad.u-strasbg.fr/simbad/sim-id?Ident=G55.7+3.4&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id G55.7+3.4.].  The data were taken on August 23, 2010, in the first D-configuration for which the new wide-band capabilities of the WIDAR correlator were available.  The 8-hour-long observation includes all available 1 GHz of bandwidth in L-band, from 1-2 GHz in frequency.
-The measurement set which provides a starting point for this Guide has been imported from the SDM file set and time-averaged to 10 seconds.  Both of these options are available from the NRAO data archive, and since this operation can be relatively time-consuming, the imported, time-averaged dataset is being provided.  The original data set can be found here; note that it is 170 GB in raw form.
+The data have also been flagged and calibrated, and the corrected data for G55.7+3.4 have been split off to
-Averaging to 10 seconds and the removal of some scans which are not used in this tutorial reduces the size of the data set to around 14 GB; the addition of columns for model and corrected data (known as "scratch columns") returns it to 43 GB, which is the size of the measurement set which will be used here.
+<!-- The measurement set which provides a starting point for this Guide has been imported from the SDM file set and time-averaged to 10 seconds.  Both of these options are available from the NRAO data archive, and since this operation can be relatively time-consuming, the imported, time-averaged dataset is being provided.  The original data set can be found here; note that it is 170 GB in raw form.
+Averaging to 10 seconds and the removal of some scans which are not used in this tutorial reduces the size of the data set to around 14 GB; the addition of columns for model and corrected data (known as "scratch columns") returns it to 43 GB, which is the size of the measurement set which will be used here. -->
+== Preliminary data evaluation ==
+plotms, plotants, viewer (?)
+== A priori calibration and flagging ==
+=== Antenna position correction ===
+=== Flagging non-operational antennas ===
+== Automatic RFI excision ==
+=== Hanning-smoothing data ===
+=== Using phase calibration source for preliminary bandpass calibration ===
+=== Running testautoflag ===
+=== Evaluating results & manual flagging ===
+Flagging lowest edge of SPW 0 ...
+== Calibrating data ==
+=== Clearing previous calibration ===
+=== Setting flux scale ===