85 lines
2.6 KiB
Python
85 lines
2.6 KiB
Python
# coding: utf-8
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import numpy as np
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import h5py
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from astropy import units as u
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def load_fields(path):
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"""
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Parameters
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----------
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path : _type_
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_description_
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output : _type_
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_description_
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Returns
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-------
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dict
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A dataset of cells in the following format:
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gas:
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position (Ngas, 3) [kpc], centered
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volume (Ngas) [pc^3]
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velocity (Ngas, 3) [km/s]
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mass (Ngas) [Msun]
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stars:
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position (Nstar, 3) [kpc], centered
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velocity (Nstar, 3) [km/s]
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mass (Nstar) [Msun]
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birth_time (Nstar) [Myr]
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dm:
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position (Ngas, 3) [kpc], centered
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velocity (Ngas, 3) [km/s]
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mass (Ngas) [Msun]
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maps:
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extent (xmin, xmax, ymin, ymax) Coordinates of the edges of the map, centered
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gas_coldens (Nx, Ny) [Msun/pc^2], map of column density
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"""
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snap = h5py.File(path)
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info = snap["Header"].attrs
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gas = snap["PartType0"]
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stars = snap["PartType4"]
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time = info["Time"]
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box_size = info["BoxSize"]
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UnitLength_in_kpc = info["UnitLength_in_cm"] * u.cm.to(u.kpc)
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UnitVelocity_in_km_per_s = info["UnitVelocity_in_cm_per_s"] * u.cm.to(u.km)
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UnitTime_in_Myr = (
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info["UnitLength_in_cm"] / info["UnitVelocity_in_cm_per_s"]
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) * u.s.to(u.Myr)
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UnitMass_in_Msun = info["UnitMass_in_g"] * u.g.to(u.Msun)
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# Create dataset
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data = {
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"header": {"time": time * UnitTime_in_Myr, "fluids": ["gas", "stars"]},
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"gas": {
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"position": (
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np.asarray(gas["CenterOfMass"]) - np.array([0.5, 0.5, 0.5]) * box_size
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)
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* UnitLength_in_kpc,
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"volume": (np.asarray(gas["Masses"]) / np.asarray(gas["Density"]))
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* UnitLength_in_kpc**3,
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"velocity": np.asarray(gas["Velocities"]) * UnitVelocity_in_km_per_s,
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"mass": np.asarray(gas["Masses"]) * UnitMass_in_Msun,
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},
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"stars": {
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"position": (
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np.asarray(stars["Coordinates"]) - np.array([0.5, 0.5, 0.5]) * box_size
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)
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* UnitLength_in_kpc,
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"velocity": np.asarray(stars["Velocities"]) * UnitVelocity_in_km_per_s,
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"mass": np.asarray(stars["Masses"]) * UnitMass_in_Msun,
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"birth_time": np.asarray(stars["StellarFormationTime"]) * UnitTime_in_Myr,
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},
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}
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return data
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if __name__ == "__main__":
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from snapshotprocessor import SnapshotProcessor
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data = load_fields(
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"/home/nbrucy/Travail/Postdoc/Ecogal/MW/junia2_0.25kpc/OUTPUT_SN/snap_150.hdf5"
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)
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