Description
Apply visibility tapering to emphasize certain scale structures. The
imaging tapers are applied to a Table column called IMAGING_WEIGHT,
which may be plotted using
plotweights. In addition, this column
may be accessed directly using either the
table
or
ms modules. Note that the taper is multiplicative and
so the weights must be calculated first using
weight. The points are not flagged!
Note that the scale size to be emphasized is given in the image plane
as the parameters of the corresponding Gaussian. Note also use of this
function provides an optimum detection for the given scale size, which
is not the same as requiring that the resulting dirty beam have the
specified Gaussian fit. The resultant fitted beam size will very
roughly be the quadratic sum of the original beam and the specified
beam. If you wish to obtain a specified beam, then the best approach
is to perform this calculation and check the value obtained using
imager.fitpsf.
Arguments
type |
in |
Type of filtering or u-v tapering |
|
|
Allowed: |
String |
|
|
Default: |
gaussian |
bmaj |
in |
Major axis of filter |
|
|
Allowed: |
Quantity |
|
|
Default: |
'0rad' |
bmin |
in |
Minor axis of filter |
|
|
Allowed: |
Quantiy |
|
|
Default: |
'0rad' |
bpa |
in |
Position angle of filter |
|
|
Allowed: |
Quantity |
|
|
Default: |
'0deg' |
async |
|
Run asynchronously in the background |
|
|
Allowed: |
Bool |
|
|
Default: |
!dowait |