AIPS HELP file for SPXMD in 31DEC25
As of Wed Mar 26 15:37:05 2025
SPXMD: Task to alter image adding models w spectral index
INPUTS
INNAME Input I image name (name).
INCLASS Input I image name (class).
INSEQ 0.0 9999.0 Input I image name (seq. #).
INDISK 0.0 9.0 Input I image disk unit #.
OUTNAME Output image name (name).
OUTCLASS poutput image name (class)
OUTSEQ -1.0 9999.0 Output image name (seq. #).
OUTDISK 0.0 9.0 Output image disk unit #.
BLC Bottom left corner of input.
TRC Top right corner of input.
FLUX Noise level to add
FACTOR Multiplication factor.
REFREQ Reference frequency in GHz
INLIST List of sources up to 9999
New image parameters:
COORDINA Ra, Dec coordinates
IMSIZE Ra, Dec number of pixels
CELLSIZE Ra, Dec increments in asec
APARM (1) Frequency (GHz) plane 1
(2) increment (GHz)
(3) number channels
FPARM Start channel: offset
RPARM End channel: offset
VPARM Scale amplitude
DOFIT Scale noise
HELP SECTION
SPXMD
Type: TASK
Use: This task can be used to modify an existing image cube adding
Gaussian components with spectral index.
Adverbs:
INNAME.....Input image name (name). No default.
INCLASS....Input image name (class). Standard defaults.
INSEQ......Input image name (seq. #). 0 => highest.
INDISK.....Disk drive # of input image. 0 => any.
OUTNAME....Output image name (name). Standard defaults.
OUTCLASS...Output image name (class). Standard defaults.
OUTSEQ.....Output image name (seq. #). 0 => highest unique.
OUTDISK....Disk drive # of output image. 0 => highest
number with sufficient space.
BLC........Bottom right corner in input image of desired
subimage. Default is entire image.
TRC........Top right corner in input image of desired
subimage. Default is entire image.
FLUX.......Noise level to be added (in the units of the image)
FACTOR.....Factor by which the original data is multiplied
before it is added to the model. 0 => drop original
data.
REFREQ.....Reference frequency in GHz. 0 -> header or APARM(1)
for a new image cube.
INLIST.....Text file containing one line per source, giving
Peak, X, Y, Maj, Min, PA, type, spectral index, curvature
blank separated free format and all values must be
specified even if zero. The resulting NGAUS will be the
number of non-comment lines in INLIST. Limit 9999.
(1) The is in Jy/beam;
(2) The component coordinates and size are X, Y, Maj
and Min are in pixels, PA in degrees;
(3) Types are point, Gaussian, uniform disk, uniform
rectangle, optically thin sphere, and exponential for
code numbers 1 through 6. Other values -> 2.
Blank lines and lines beginning with # or ; (semi-colon)
are taken as comments
COORDINA...RA (hours minutes seconds of time), declination (degrees,
minutes, seconds of arc) for reference pixel (at image
center).
IMSIZE.....X, Y image size in pixels
CELLSIZE...X, Y image spacing in arc sec
APARM......(1) Reference frequency at first output plane in GHz
(2) Increment in frequency in GHz
(3) Number of frequency pixels
FPARM......Start channel number for group i
RPARM......End channel number for group i
VPARM......Multiply amplitude for group i
DOFIT......Multiply noise (FLUX) for group i
To offset 3 groups in amplitude and 2 in noise for example
FPARM 1 20 88
RPARM 7 33 99
VPARM 0.8 1.2 0.9
DOFIT 1 3 2
If making a new image set INNAME blank. COORDINA, IMSIZE, CELLSIZE
are required for a new image, ignored for an existing image.
APARM is rquired for a new image, APARM(3) is ignored for an
existing image unless there is only one plane. APARM(1) and (2)
are used if set even with an existing image.
EXPLAIN SECTION