def star_age(field, data):
if data.ds.cosmological_simulation:
conformal_age = data[ptype, 'conformal_birth_time']
formation_time = convert_ramses_ages(data.ds, conformal_age)
formation_time = data.ds.arr(formation_time, 'code_time')
else:
formation_time = data['particle_birth_time']
return data.ds.current_time - formation_time
def particle_age(field, data):
msg = ("The RAMSES particle_age field has been deprecated since "
"it did not actually represent particle ages in all "
"cases. To get the time when a particle was formed use "
"the particle_birth_time field instead. To get the "
"age of a star particle, use the star_age field")
if not isinstance(data, FieldDetector):
issue_deprecation_warning(msg, stacklevel=2)
if data.ds.cosmological_simulation:
conformal_age = data[ptype, 'conformal_birth_time']
ret = convert_ramses_ages(data.ds, conformal_age)
return data.ds.arr(ret, 'code_time')
else:
return data[ptype, 'particle_birth_time']
