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)
Man(1) output converted with
man2html