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Name

velcube - create a data cube from a velocity field

Synopsis

velcube [parameter=value]

Description

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).

Parameters

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].

Examples

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.

See Also

ccdvel(1NEMO) , rotcurshape(1NEMO)

Files

src/image/rotcur/velcube.c

Author

Peter Teuben

Update History


29-May-04    V1.0 Created    PJT


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