rcore

clustertools.analysis.functions.rcore(cluster, method='casertano', nneighbour=6, mfrac=0.1, projected=False, plot=False, **kwargs)

Calculate core radius of the cluster – The default method (method=’casertano’) follows Casertano, S., Hut, P. 1985, ApJ, 298, 80 to find the core – An alternative metrhod (method==’isothermal’) assumes the cluster is an isothermal sphere the core radius is where density drops to 1/3 central value — For projected core radius, the core radius is where the surface density profile drops to 1/2 the central value — Note that the inner mass fraction of stars used to calculate central density is set by mfrac (default 0.1 = 10%)

Parameters:

clusterclass

StarCluster instance

methodstring

method of calculating the core radius of a star cluster (default ‘casertano’)

if method ==’casertano’:

nneighbourint

number of neighbours for calculation local densities

if method==’isothermal’:

mfracfloat

inner mass fraction to be used to establish the central density

projectedbool

use projected values (default: False)

plotbool

plot the density profile and mark the core radius of the cluster (default: False)

Returns

——-

rcfloat

core radius

Other Parameters:

None