1 files changed, 130 insertions, 8 deletions
diff --git a/fg21sim/extragalactic/clusters/main.py b/fg21sim/extragalactic/clusters/main.py
index 8f7f8e7..c05af3e 100644
--- a/fg21sim/extragalactic/clusters/main.py
+++ b/fg21sim/extragalactic/clusters/main.py
@@ -1,24 +1,146 @@
-# Copyright (c) 2017 Weitian LI <liweitianux@live.com>
+# Copyright (c) 2017 Weitian LI <weitian@aaronly.me>
 # MIT license
 
 """
-Simulate (giant) radio halos of galaxy clusters as one of the
-foreground components.
+Simulate the extended radio emissions from the galaxy cluster,
+e.g., giant radio halos, radio relics.
+
+NOTE
+----
+There are other types of extended radio emissions not considered
+yet, e.g., mini-halos, roundish radio relics, etc.
 """
 
+import os
 import logging
 
 import numpy as np
+import pandas as pd
 
-from .halo import HaloSingle
+from .formation import ClusterFormation
+from .halo import RadioHalo
+from ...sky import get_sky
+from ...utils.cosmology import Cosmology
+from ...utils.random import spherical_uniform
+from ...utils.io import dataframe_to_csv
 
 
 logger = logging.getLogger(__name__)
 
 
-class Halos:
+class GalaxyClusters:
     """
-    Simulate (giant) radio halos of galaxy clusters as one of the
-    foreground components.
+    Simulate the extended radio emissions from the galaxy clusters.
+
+    NOTE
+    ----
+    Currently, only the *giant radio halos* are considered, while
+    other types of extended emissions are missing, e.g., mini-halos,
+    elongated relics, roundish relics.
     """
-    pass
+    # Component name
+    name = "galaxy clusters"
+
+    def __init__(self, configs):
+        self.configs = configs
+        self.sky = get_sky(configs)
+        self._set_configs()
+
+    def _set_configs(self):
+        """
+        Load the configs and set the corresponding class attributes.
+        """
+        comp = "extragalactic/clusters"
+        self.catalog_path = self.configs.get_path(comp+"/catalog")
+        self.catalog_outfile = self.configs.get_path(comp+"/catalog_outfile")
+        self.prefix = self.configs.getn(comp+"/prefix")
+        self.save = self.configs.getn(comp+"/save")
+        self.output_dir = self.configs.get_path(comp+"/output_dir")
+        if self.sky.type_ == "patch":
+            self.resolution = self.sky.pixelsize
+        else:
+            raise NotImplementedError("TODO: full-sky simulations")
+        #
+        self.filename_pattern = self.configs.getn("output/filename_pattern")
+        self.use_float = self.configs.getn("output/use_float")
+        self.checksum = self.configs.getn("output/checksum")
+        self.clobber = self.configs.getn("output/clobber")
+        # Cosmology model
+        self.H0 = self.configs.getn("cosmology/H0")
+        self.OmegaM0 = self.configs.getn("cosmology/OmegaM0")
+        self.Omegab0 = self.configs.getn("cosmology/Omegab0")
+        self.sigma8 = self.configs.getn("cosmology/sigma8")
+        self.cosmo = Cosmology(H0=self.H0, Om0=self.OmegaM0,
+                               Ob0=self.Omegab0, sigma8=self.sigma8)
+        #
+        logger.info("Loaded and set up configurations")
+
+    def _load_catalog(self):
+        """
+        Load the sampled (z, M) catalogs from the Press-Schechter
+        formalism for the clusters in this sky patch.
+
+        Catalog columns
+        ---------------
+        * ``z`` : redshifts
+        * ``mass`` : cluster mass; unit: [Msun]
+        """
+        self.catalog = pd.read_csv(self.catalog_path)
+        num = len(self.catalog)
+        logger.info("Loaded (z, M) catalog: %d clusters" % num)
+
+    def _process_catalog(self):
+        """
+        Do some basic processes to the catalog:
+
+        * Generate random positions within the sky for each cluster;
+        * Generate random elongated fraction;
+        * Generate random rotation angle.
+
+        Catalog columns
+        ---------------
+        * ``lon`` : longitudes; unit: [deg]
+        * ``lat`` : latitudes; unit: [deg]
+        * ``felong`` : elongated fraction, defined as the ratio of
+                       elliptical semi-major axis to semi-minor axis;
+                       restricted within [0.3, 1.0]
+        * ``rotation`` : rotation angle; uniformly distributed within
+                         [0, 360.0); unit: [deg]
+
+        NOTE
+        ----
+        felong (elongated fraction) ::
+            Adopt a definition (felong = b/a) similar to the Hubble
+            classification for the elliptical galaxies.  As for the
+            elliptical galaxies classification, E7 is the limit (e.g.,
+            Wikipedia), therefore felong is also restricted within
+            [0.3, 1.0], and sampled from a cut and absolute normal
+            distribution centered at 1.0 with sigma ~0.7/3 (<= 3σ).
+        """
+        logger.info("Preliminary processes to the catalog ...")
+        num = len(self.catalog)
+        lon, lat = self.sky.random_points(n=num)
+        self.catalog["lon"] = lon
+        self.catalog["lat"] = lat
+        logger.info("Added catalog columns: lon, lat.")
+
+        felong_min = 0.3
+        sigma = (1.0 - felong_min) / 3.0
+        felong = 1.0 - np.abs(np.random.normal(scale=sigma, size=num))
+        felong[felong < felong_min] = felong_min
+        logger.info("Added catalog column: felong.")
+
+        rotation = np.random.uniform(low=0.0, high=360.0, size=num)
+        self.catalog["rotation"] = rotation
+        logger.info("Added catalog column: rotation.")
+
+    def postprocess(self):
+        """
+        Do some necessary post-simulation operations.
+        """
+        # Save the effective/inuse clusters catalog
+        logger.info("Save the resulting catalog ...")
+        if self.catalog_outfile is None:
+            logger.warning("Catalog output file not set; skip saving!")
+        else:
+            dataframe_to_csv()