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import pynbody
import numpy as np
import matplotlib.pyplot as plt
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sim = pynbody.load(“MW_002_snap_0021.gadget2”)
sim.physical_units()
pynbody.analysis.angmom.faceon(sim)
pynbody.plot.angular_momentum(sim, center=”disk”, filename=’MW_disk_faceon_angmom.png’)
1. `import pynbody`: Imports the Pynbody library.
2. `import numpy as np`: Imports the NumPy library for numerical operations.
3. `import matplotlib.pyplot as plt`: Imports the Matplotlib library for plotting.
4. `sim = pynbody.load("MW_002_snap_0021.gadget2")`: Loads a Pynbody simulation from a Gadget-2 format file named `MW_002_snap_0021.gadget2`. This file likely contains data about a particular snapshot of the simulated galaxy's evolution.
5. `sim.physical_units()`: Sets the simulation's physical units to default values (e.g., Msun, kpc, Myr). This ensures that any physical quantities computed from the simulation data will be in the correct units.
6. `pynbody.analysis.angmom.faceon(sim)`: Calculates the face-on angular momentum vector and tensor for particles in the simulation. The face-on view is aligned with the simulation's z-axis.
7. `pynbody.plot.angular_momentum(sim, center="disk", filename='MW_disk_faceon_angmom.png')`: Plots the face-on angular momentum of the simulated galaxy. The `center` parameter specifies the center around which the angular momentum is calculated, which in this case is the "disk" of the galaxy. The resulting plot will be saved to a file named `MW_disk_faceon_angmom.png`.
This code essentially calculates and plots the angular momentum of the simulated galaxy as seen from a face-on perspective, providing insights into the galaxy's rotational properties and dynamics.
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