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Name

velmap - various galactic velocity field mapping routines

Synopsis

velmap [parameter=value]

Description

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.

Parameters

The following parameters are recognized in order; they may be given in any order if the keyword is also given. Use --help to confirm this man page is up to date.
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]
vsys=
systemic velocity [0]
center=
rotation center. Default is the mapcenter ((Nx-1)/2,Ny-1)/2) where 0,0=center of lower left pixel.
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.

See Also

rotcur(1NEMO) , velfit(1NEMO) , runvelfitss07(1NEMO) , rotcurshape(1NEMO)

Files

src/image/rotcur : velmap.c

Author

Peter Teuben

Update History


3-feb-2011    created for Nurur    PJT

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