ROTATIONCURVE(1)          TIPSY COMMANDS         ROTATIONCURVE(1)




NAME

       rotationcurve  -  calculate the circular velocity rotation
       curve


SYNOPSIS

       rotationcurve box-number  center-box-number  binning  bin-
       number filename minimum_radius maximum_radius


ALIASES

       rotcur


DESCRIPTION

       rotationcurve  is  a  command that produces a file of name
       filename that contains the circular velocity as a function
       of  radius gravitationally induced by the particles in box
       box-number.

       The center of rotation is taken to be the center  of  mass
       of  the  particles  in box center-box-number.  The binning
       argument refers to the distribution of the bins where  the
       circular  velocity is evaluated, either linearly or log in
       radius.  There are bin-number bins equally distributed  in
       either  radius  or  log  radius between minimum_radius and
       maximum_radius.

       The output  file  has  the  following  four  columns:  the
       radius, the total circular velocity, the circular velocity
       if only the dark matter were included,  and  the  circular
       velocity  if only the baryonic matter (stars and gas) were
       included.  The circular velocity is calculated in a  plane
       perpendicular to the angular momentum axis of the gas par-
       ticles in box box-number.  The calculated velocity is  the
       average of four perpendicular directions in this plane.

       If  the  boxes  box-number  or  center-box-number  are not
       loaded an error is generated.  Boxes can be  loaded  using
       either the makebox, setbox, or setsphere commands.


OPTIONS

   Binning
       The possible choices for binning are:

              lin
                 Make  bin-number  bins  spaced equally in radius
                 between minimum-radius and maximum_radius

              log
                 Make  bin-number  bins  spaced  equally  in  log
                 radius between minimum-radius and maximum_radius


SEE ALSO

       makebox(1),  moments(1),   profile(1),   setbox(1),   set-
       sphere(1)


BUGS

       This  command  assumes  the  existence of gas particles to
       determine the plane in which the rotation curve is  calcu-
       lated.



KQ Release 2.0            22 MARCH 1994          ROTATIONCURVE(1)

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