# galpy.df.streamdf.length¶

streamdf.length(threshold=0.2, phys=False, ang=False, tdisrupt=None, **kwargs)[source]

NAME:

length

PURPOSE:

calculate the length of the stream

INPUT:

threshold - threshold down from the density near the progenitor at which to define the ‘end’ of the stream

phys= (False) if True, return the length in physical kpc

ang= (False) if True, return the length in sky angular arc length in degree

coord - coordinate to return the density in (‘apar’ [default],
‘ll’,’ra’,’customra’,’phi’)

OUTPUT:

length (rad for parallel angle; kpc for physical length; deg for sky arc length)

HISTORY:

2015-12-22 - Written - Bovy (UofT)