pynbody.analysis.morphology.estimate_jcirc_from_rotation_curve

pynbody.analysis.morphology.estimate_jcirc_from_rotation_curve(h, particles_per_bin=1000)

Estimate the circular angular momentum as a function of radius in the disk (x-y) plane.

This routine calculates the circular velocity as a function of radius for the disk, using a profile with a fixed number of particles per radial bin. It then estimates a circular angular momentum for each individual particle by interpolating the profile.

Warning

This routine is only valid for simulations where all the stars are anyway in quite a narrow disc. Otherwise the interpolation back onto the individual particles carries limited meaning.

For more general cases, use estimate_jcirc_from_energy() instead.

Parameters:

• h (SimSnap) – The simulation snapshot to analyze

• particles_per_bin (int) – The approximate number of particles per bin in the profile. Default is 1000.