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snapaxsym - generates an around-axis integrated ccd-like frame of an N-body
snapshot
snapaxsym in=snapshot out=image [parameter=value]
snapaxsym
makes a ccd frame from an N-body snapshot, by binning the (r,z) in the cylindrical
coordinate of all stars on a regular rectangular (square) grid and assigning
a mean integrated ’local density’ (integrated around z-axis, i.e. by assuming
the axial symmetry around the z-axis, units: mass (intensity). There is an
option which produces the map of rotation velocity insted of the density
The ccd frame is written to a standard Image(5)
output file, and can be
accessed by various other programs for smoothing, display etc.
snaprotate(1NEMO)
has to be used first to set the axis of the symmetry not parallel to the
coordinate axis.
The following parameters are recognized in any
order if the keyword is also given:
- in=in-file
- input file, must be in SnapShot(5)
format [no default].
- out=out-file
- output file, will be in Image(5)
format
[no default].
- times=time-range
- Only data frames with time values within
time-range, which is of the form, eg, "1.0:1.5,2.5,3.0", will be translated.
[default: all].
- size=value
- Size of the CCD frame in sky units. Note that
the picture is forced to be square [default: 5.0].
- cell=value
- Cell- or pixel
size. Again they will be square. For a 2D matrix this value will be set by
the header of that dataset. [default: 0.1].
- vrot=t|f
- Logical if the map of
rotational velocity is requested. [default: f].
snapccd(1NEMO)
, snaprotate(1NEMO)
,
ccdsmooth(1NEMO)
The values of density of the cells closest to the
axis of symmetry may be erratic.
Jun Makino
7-Dec-88 V1.0: Created JM
7-jul-89 V1.2: get_snap() PJT
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