AIPS HELP file for CXIMAGR in 31DEC24
As of Fri Apr 26 22:02:24 2024
CXIMAGR: Task to make and Clean complex images
INPUTS
INNAME UV data (name).
INCLASS UV data (class).
INSEQ 0.0 9999.0 UV data (seq. #). 0 => high
INDISK Disk unit #. 0 => any
OUTNAME Image data (name).
OUTSEQ 0.0 9999.0 Image data (seq. #). 0=>high
OUTDISK Disk unit #. 0 => any
BIF 0.0 100.0 Lowest IF number 0=1
EIF 0.0 100.0 Highest IF number
BCHAN 0.0 2048.0 Low channel number 0=>1
ECHAN 0.0 2048.0 High channel number
DPARM Control info:
(7) > 0 => do NOT divide by
the summed weights
(8) > 0 -> use XTYPE, YTYPE
and interpolate to grid
(10) Use data weight to the
power 1/DPARM(10)
SCALR3 -1. 1. > 0 => do not grid Hermitian
IMSIZE 1.0 16384.0 Output image size in x,y
CELLSIZE 0.000001 Cell size (arc sec)
DOROBUST -1.0 1.0 > 0 use ROBUST weighting
ROBUST -5.0 5.0 Brigg's robustness parameter
NITER Maximum # of CLEAN components
<= 0 -> no CXCLN
GAIN 0.0 2.0 CLEAN loop gain
FLUX 0.0 Min. residual in window (Jy)
BMAJ FWHM(asec) maj. axis CLEAN
restoring beam.
0 -> proc will fit QBM001
BMIN FWHM(asec) min. axis CLEAN
restoring beam.
BPA -360.0 360.0 CLEAN beam position angle
NBOXES 0.0 50.0 Number of boxes for CLEAN
CLBOX 0.0 4096.0 Four coordinates for each box
BADDISK Disk to avoid for scratch.
HELP SECTION
CXIMAG
Type: Procedure
Use: Grids UV data to make images in U and V of the real and imaginary
parts of the data and of the sampling function using UVIMG. Then
it runs FFT on these "images" to make complex map-plane images.
Finally, and optonally, it runs CXCLN. The u-v plane images
are assigned classes CXreal, CXimag, and CXbeam. The mape plane
images are given classes QIM001, UIM001, QBM001, UBM001, QCL001,
and UCL001. (These classes are to satisfy the requirements of
CXCLN.)
The input data should be a single-source, fully calibrated data
set. All included spectral channels will be "averaged".
DPARM(8) was added to signal your intention to use convolving
functions when interpolating to the grid. This may be desirable
for this operation. The spheroidal convolving function is used.
DOROBUST was added to allow for ROBUST-tempered uniform
weighting.
Adverbs:
INNAME.....UV file name (name). Standard defaults.
INCLASS....UV file name (class). Standard defaults.
INSEQ......UV file name (seq. #). 0 => highest.
INDISK.....Disk unit #. 0 => any.
OUTNAME....Image file name (name). Standard defaults.
OUTSEQ.....Image file name (seq. #). 0 => highest.
OUTDISK....Output disk unit #. Standard defaults.
BIF........Lowest IF to grid. IF will be axis 4.
EIF........Highest IF to grid. 0 => highest.
BCHAN......First channel to grid. 0 => 1.
ECHAN......Last channel to grid. 0 => highest.
DPARM......Control info: (1-6, 9 set by proc)
(7) > 0 => do NOT divide by the count (or sum of
convolution weights). Makes image a convolution
such as done by IMAGR, UVMAP, et al.
<= 0 => do divide by the sum of counts or convolution
function weights in each cell. Makes image an
interpolation of the data.
(8) > 0 => use spheroidal convolution function rather than
a 1-cell pillbox.
<= 0 => put each sample at the nearest grid cell.
(10) > 0 => use data weight when gridding to the power
1/DPARM(10)
NOTE WELL: data weights are ignored if DPARM(10) is
not set!
SCALR3.....> 0 -> do NOT grid the Hermitian point of the visibility
IMSIZE.....X,Y output image size, NO DEFAULT, power of 2 strongly
recommended
CELLSIZE...The "Q" and "U" image cell sizes in seconds of arc.
NO DEFAULT.
DOROBUST...> 0 => Do uniform -> natural weighting
If > 0, then DPARM(7) is set to 1 so that weighting is
done by this process rather than normalizing by counts
or sum of weights.
ROBUST.....Brigg's robustmess parameter. -4 uniform, 4 natural
See help file for details.
GAIN........The CLEAN loop gain. 0 => 0.10
NITER.......CLEAN iteration limit. <= 0 -> no CXCLN
FLUX........Stop CLEAN when abs(resid. image max in CLEAN
window) < FLUX (Jy).
BMAJ........The FWHM (asec) major axis of the restoring beam.
The parameters of the restoring beam should be provided.
If <= 0, the procedure will try JMFIT on the QBM001
image.
BMIN........The FWHM (asec) minor axis of the restoring beam.
BPA.........The position angle in the unrotated image of BMAJ.
NBOXES......Number (<=50) of rectangular search boxes. 0 => 1
CLBOX.......A 4x50 array with the BLC and TRC of each box.
0 => use inner quarter of input map (first box)
0 => ignore box (boxes 2 - 50)
BADDISK....Disk numbers to avoid for scratch files. Scratch
files may be created by the sorting routines if
calibration or flagging is applied.
EXPLAIN SECTION