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mkplum - initial conditions from a Plummer model (public version)


mkplum [parameter=value]


requires NEMO version 3.0.13 or higher, see


mkplum creates N-body initial conditions from an isotropic Plummer model, which has density
                3         M * r_s
    rho(r) = ------ -------------------,
                       2      2  (5/2)
              4*Pi   (r  + r_s  )
with total mass M and scale radius  r_s.
parameters out=file The initial conditions are written in NEMO snapshot
format to file. If file=-, output is made to stdout. Default: required. nbody=num
The initial conditions will contain num body masses, positions, and velocities.
Default: required. r_s=val The scale radius of the Plummer sphere is set
to val. Default: 1. mass=val The total mass of the Plummer sphere is set
to val. Default: 1. seed=num We will use num as seed for the (pseudo-) random
number generator. If num=0, a unique new seed is created from the current
value of the time, otherwise, the seed actually provided is used. Default:
0. q_ran=t|f If true, we use quasi-random rather than pseudo-random numbers
for drawing position and angles in velocity space. Pseudo-random numbers
are still used in the rejection-method to draw the total velocity from the
DF. Default: f. time=val The simulation time associated with the initial
conditions is set to val. Default: 0. f_pos=val The fraction of bodies with
positive sense of rotation about the z-axis is set to val. Default: 0.5. rmax=val
If given, only bodies with radius < val are created. No default. WD_units=t|f
If true, units for mass and r_s will be taken as solar mass and kpc, respectively,
but output units will be in kpc (positions), kpc/Gyr (velocities), and
222288.47 solar masses (implying Newton’s G=1). Default: f.  remarkmkplum differs
from mkplummer(1NEMO) in several ways. The most important additional features
are q_ran and WD_units.  see alsomkdehnen(1falcON), mkking(1falcON)  
falcON/doc/user_guide.pdf                         User Guide for falcON


Walter Dehnen                    
update history of this man page
18-May-2004    first version of manual written WD

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