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velmap - various galactic velocity field mapping routines
velmap
[parameter=value]
VELMAP has various mapping routines that can
be done on galactic velocity field. The velocity field can be from observations,
or a model.
In practice this also means that on a set of projected rings,
defined by their radii, a center, position angle and inclination, various
computations can be done and tabulated.
An output map can be generated
with amusing quantities.
The following parameters are recognized
in any order if the keyword is also given:
- in=
- input velocity field, in
image(5NEMO)
format.
- radii=
- radii of the ring boundaries. For N rings, N+1
values need to be give. They need to be sorted by increasing radius.
- pa=
- position angle of disk, in degrees. [0]
- inc=
- inclination angle of disk,
in degrees [45]
- center=
- rotation center. Default is the mapcenter ((Nx-1)/2,Ny-1)/2)
where 0,0=center of lower left pixel.
- vsys=
- systemic velocity [0]
- den=
- input density image, only needed if surface brightness (d) given in an
output mode. Default: not used. mode=. Default: none.
- frang=
- free angle around
minor axis (2*frang is the total angle around the minor axis used). [Default:
0]
- blank=
- Value of the blank pixel to be ignored. Default: 0.0
- mode=
- Output
mode for the output data file. Valid are: v, v/r (angular velocity), v*d/r
(angular velocity times surface brightness)
- out=
- Optional output file.
See mode= which quantity. Default: none
- tab=
- Optional output table file.
This will contain the radius, rotation speed, dispersion in the ring and
some other values.
rotcur(1NEMO)
, velfit(1NEMO)
, runvelfitss07(1NEMO)
,
rotcurshape(1NEMO)
src/image/rotcur : velmap.c
Peter Teuben
3-feb-2011 created for Nurur PJT
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