Source code for pyxsim.light_cone

import time

from pyxsim.photon_list import make_photons, project_photons
from pyxsim.utils import parse_value

from yt_astro_analysis.cosmological_observation.api import LightCone

from yt.loaders import load

from soxs.utils import parse_prng

from yt.utilities.parallel_tools.parallel_analysis_interface import \

comm = communication_system.communicators[-1]

axes_lookup = [(1,2), (2,0), (0,1)]

[docs]class XrayLightCone(LightCone): def __init__(self, parameter_filename, simulation_type, near_redshift, far_redshift, seed=None, use_minimum_datasets=True, deltaz_min=0.0, minimum_coherent_box_fraction=0.0): if seed is None: seed = time.time() super(XrayLightCone, self).__init__( parameter_filename, simulation_type, near_redshift, far_redshift, use_minimum_datasets=use_minimum_datasets, deltaz_min=deltaz_min, minimum_coherent_box_fraction=minimum_coherent_box_fraction) self.calculate_light_cone_solution(seed=seed)
[docs] def generate_events(self, photon_prefix, event_prefix, area, exp_time, angular_width, source_model, sky_center, parameters=None, velocity_fields=None, absorb_model=None, nH=None, no_shifting=False, sigma_pos=None, prng=None): """ Generate projected events from a light cone simulation. Parameters ---------- photon_prefix : string The prefix of the filename(s) containing the photon list. If run in serial, the filename will be "{photon_prefix}.lc{i}.h5", where i iterates over the elements of the light cone solution. If run in parallel, the filenames will be "{photon_prefix}.lc{i}.{mpi_rank}.h5". event_prefix : string The prefix of the filename(s) which will be written to contain the event list. If run in serial, the filename will be "{event_prefix}.h5", if run in parallel, the filename will be "{event_prefix}.{mpi_rank}.h5". area : float, (value, unit) tuple, or :class:`~yt.units.yt_array.YTQuantity` The collecting area to determine the number of events. If units are not specified, it is assumed to be in cm^2. exp_time : float, (value, unit) tuple, or :class:`~yt.units.yt_array.YTQuantity` The exposure time to determine the number of events. If units are not specified, it is assumed to be in seconds. angular_width : float, (value, unit) tuple, or :class:`~yt.units.yt_array.YTQuantity` The angular width of the light cone simulation. If units are not specified, it is assumed to be in degrees. source_model : :class:`~pyxsim.source_models.sources.SourceModel` A source model used to generate the events. sky_center : array-like Center RA, Dec of the events in degrees. parameters : dict, optional A dictionary of parameters to be passed for the source model to use, if necessary. velocity_fields : list of fields The yt fields to use for the velocity. If not specified, the following will be assumed: ['velocity_x', 'velocity_y', 'velocity_z'] for grid datasets ['particle_velocity_x', 'particle_velocity_y', 'particle_velocity_z'] for particle datasets absorb_model : string A model for foreground galactic absorption, to simulate the absorption of events before being detected. Known options are "wabs" and "tbabs". nH : float, optional The foreground column density in units of 10^22 cm^{-2}. Only used if absorption is applied. no_shifting : boolean, optional If set, the photon energies will not be Doppler shifted. sigma_pos : float, optional Apply a gaussian smoothing operation to the sky positions of the events. This may be useful when the binned events appear blocky due to their uniform distribution within simulation cells. However, this will move the events away from their originating position on the sky, and so may distort surface brightness profiles and/or spectra. Should probably only be used for visualization purposes. Supply a float here to smooth with a standard deviation with this fraction of the cell size. Default: None prng : integer or :class:`~numpy.random.RandomState` object A pseudo-random number generator. Typically will only be specified if you have a reason to generate the same set of random numbers, such as for a test. Default is to use the :mod:`numpy.random` module. """ prng = parse_prng(prng) area = parse_value(area, "cm**2") exp_time = parse_value(exp_time, "s") aw = parse_value(angular_width, "deg") for i, output in enumerate(self.light_cone_solution): ds = load(output["filename"]) dw = ds.domain_width ax = output["projection_axis"] c = output["projection_center"]*dw + ds.domain_left_edge le = c.copy() re = c.copy() width = ds.quan(aw*output["box_width_per_angle"], "unitary").to("code_length") depth = dw[ax].to("code_length")*output["box_depth_fraction"] le[ax] -= 0.5*depth re[ax] += 0.5*depth for off_ax in axes_lookup[ax]: le[off_ax] -= 0.5*width re[off_ax] += 0.5*width reg =, re) pprefix = f"{photon_prefix}.lc{i}" n_photons, n_cells = make_photons(pprefix, reg, output['redshift'], area, exp_time, source_model, parameters=parameters, center=c, velocity_fields=velocity_fields, cosmology=ds.cosmology) eprefix = f"{event_prefix}.lc{i}" n_events = project_photons(pprefix, eprefix, "xyz"[ax], sky_center, absorb_model=absorb_model, nH=nH, no_shifting=no_shifting, sigma_pos=sigma_pos, prng=prng) comm.barrier()