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velcube - create a data cube from a velocity field
velcube
[parameter=value]
velcube creates a theoretical position-position-velocity
data cube with signal derived from a velocity field (required) surface
density and velocity dispersion map (both optional).
The following
parameters are recognized in any order if the keyword is also given:
- out=
- Output file name (a cube) in image(5NEMO)
format. The X,Y coordinates will
be inherited from the input velocity field, the Z coordinates set via nz=
and zrange= (see below). No default.
- invel=
- Input velocity field. No default.
This map
- inden=
- Input surface density (optional). Should be 0 or positive
Negative densities are skipped and reported.
- insig=
- Input velocity dispersion
map (optional). Should be 0 or positive Negative dispersions are skipped
and reported. Zero dispersion amounts to only 1 slice to be populated.
- zrange=low:high
- Range in (Z) velocity. The lower value must really be lower than the higher
value. [-2:2].
- nz=
- Number of gridding pixels in Z [64]
- sigdefault=
- Default
(constant) velocity dispersion in case no dispersion map is given. [0].
A
model velocity field can be easily made with ccdvel(1NEM0)
, and using
the amp=t keyword density and dispersion (sigma) maps can also be created.
Another way to create a smooth velocity field is using rotcurshape(1NEMO)
using a 0 input map and fixing all fittable parameters. The resulting output
residual map then contains -1 times the desired velocity field.
ccdvel(1NEMO)
, rotcurshape(1NEMO)
src/image/rotcur/velcube.c
Peter Teuben
29-May-04 V1.0 Created PJT
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