"""
Definitions specific to ART
"""
#-----------------------------------------------------------------------------
# Copyright (c) 2013, yt Development Team.
#
# Distributed under the terms of the Modified BSD License.
#
# The full license is in the file COPYING.txt, distributed with this software.
#-----------------------------------------------------------------------------
yt_to_art = {
'Density': 'HVAR_GAS_DENSITY',
'TotalEnergy': 'HVAR_GAS_ENERGY',
'GasEnergy': 'HVAR_INTERNAL_ENERGY',
'Pressure': 'HVAR_PRESSURE',
'XMomentumDensity': 'HVAR_MOMENTUM_X',
'YMomentumDensity': 'HVAR_MOMENTUM_Y',
'ZMomentumDensity': 'HVAR_MOMENTUM_Z',
'Gamma': 'HVAR_GAMMA',
'MetalDensitySNIa': 'HVAR_METAL_DENSITY_Ia',
'MetalDensitySNII': 'HVAR_METAL_DENSITY_II',
'Potential': 'VAR_POTENTIAL',
'PotentialHydro': 'VAR_POTENTIAL_HYDRO',
'particle_position_x': 'POSITION_X',
'particle_position_y': 'POSITION_Y',
'particle_position_z': 'POSITION_Z',
'particle_velocity_x': 'VELOCITY_X',
'particle_velocity_y': 'VELOCITY_Y',
'particle_velocity_z': 'VELOCITY_Z',
'particle_mass': 'MASS',
'particle_index': 'PID',
'particle_species': 'SPECIES',
'creation_time': 'BIRTH_TIME',
'particle_mass_initial': 'INITIAL_MASS',
'particle_metallicity1': 'METALLICITY_SNIa',
'particle_metallicity2': 'METALLICITY_SNII',
'stars': 'STAR',
'nbody': 'N-BODY'
}
art_to_yt = dict(zip(yt_to_art.values(), yt_to_art.keys()))
[docs]class ARTIOconstants():
[docs] def __init__(self):
self.yr = 365.25*86400
self.Myr = 1.0e6*self.yr
self.Gyr = 1.0e9*self.yr
self.pc = 3.0856775813e18
self.kpc = 1.0e3*self.pc
self.Mpc = 1.0e6*self.pc
self.kms = 1.0e5
self.mp = 1.672621637e-24
self.k = 1.3806504e-16
self.G = 6.67428e-8
self.c = 2.99792458e10
self.eV = 1.602176487e-12
self.amu = 1.660538782e-24
self.mH = 1.007825*self.amu
self.mHe = 4.002602*self.amu
self.Msun = 1.32712440018e26/self.G
self.Zsun = 0.0199
self.Yp = 0.24
self.wmu = 4.0/(8.0-5.0*self.Yp)
self.wmu_e = 1.0/(1.0-0.5*self.Yp)
self.XH = 1.0 - self.Yp
self.XHe = 0.25*self.Yp
self.gamma = 5.0/3.0
self.sigmaT = 6.6524e-25