remove files

import os

import numpy as np

import astropy.constants as cons

from astropy.table import Table

from scipy import interpolate

from ObservationSim.MockObject import CatalogBase, Star, Galaxy, Quasar

class Catalog(CatalogBase):

    """An user customizable class for reading in catalog(s) of objects and SEDs.

    NOTE: must inherit the "CatalogBase" abstract class

    ...

    Attributes

    ----------

    cat_dir : str

        a directory that contains the catalog file(s)

    star_path : str

        path to the star catalog file

    star_SED_path : str

        path to the star SED data

    objs : list

        a list of ObservationSim.MockObject (Star, Galaxy, or Quasar)

        NOTE: must have "obj" list when implement your own Catalog

    Methods

    ----------

    load_sed(obj, **kwargs):

        load the corresponding SED data for one object

    load_norm_filt(obj):

        load the filter throughput for the input catalog's photometric system.

    """

    def __init__(self, config, chip, **kwargs):

        """Constructor method.

        Parameters

        ----------

        config : dict

            configuration dictionary which is parsed from the input YAML file

        chip: ObservationSim.Instrument.Chip

            an ObservationSim.Instrument.Chip instance, can be used to identify the band etc.

        **kwargs : dict

            other needed input parameters (in key-value pairs), please modify corresponding

            initialization call in "ObservationSim.py" as you need.

        Returns

        ----------

        None

        """

        super().__init__()

        self.cat_dir = os.path.join(config["data_dir"], config["catalog_options"]["input_path"]["cat_dir"])

        self.chip = chip

        if "star_cat" in config["catalog_options"]["input_path"] and config["catalog_options"]["input_path"]["star_cat"]:

            star_file = config["catalog_options"]["input_path"]["star_cat"]

            star_SED_file = config["catalog_options"]["SED_templates_path"]["star_SED"]

            self.star_path = os.path.join(self.cat_dir, star_file)

            self.star_SED_path = os.path.join(config["data_dir"], star_SED_file)

        # NOTE: must call _load() method here to read in all objects

        self.objs = []

        self._load()

    def _load(self, **kwargs):

        """Read in all objects in from the catalog file(s).

        This is a must implemented method which is used to read in all objects, and

        then convert them to ObservationSim.MockObject (Star, Galaxy, or Quasar).

        Currently, 

        the model of ObservationSim.MockObject.Star class requires:

            param["star"] : int

                specify the object type: 0: galaxy, 1: star, 2: quasar

            param["id"] : int

                ID number of the object

            param["ra"] : float

                Right ascension (in degrees)

            param["dec"] : float

                Declination (in degrees)

            param["mag_use_normal"]: float

                the absolute magnitude in a particular filter

                NOTE: if that filter is not the corresponding CSST filter, the 

                load_norm_filt(obj) function must be implemented to load the filter

                throughput of that particular photometric system

        the model of ObservationSim.MockObject.Galaxy class requires:

            param["star"] : int

                specify the object type: 0: galaxy, 1: star, 2: quasar

            param["id"] : int

                ID number of the object

            param["ra"] : float

                Right ascension (in degrees)

            param["dec"] : float

                Declination (in degrees)

            param["mag_use_normal"]: float

                the absolute magnitude in a particular filter

                NOTE: if that filter is not the corresponding CSST filter, the 

                load_norm_filt(obj) function must be implemented to load the filter

                throughput of that particular photometric system

            param["bfrac"] : float

                the bulge fraction

            param["hlr_bulge"] : float

                the half-light-radius of the bulge

            param["hlr_disk"] : float

                the half-light-radius of the disk

            param["e1_bulge"], param["e2_bulge"] : float

                the ellipticity of the bulge components

            param["e1_disk"], param["e2_disk"] : float

                the ellipticity of the disk components

            (Optional parameters):

            param['disk_sersic_idx']: float

                Sersic index for galaxy disk component

            param['bulge_sersic_idx']: float

                Sersic index for galaxy bulge component

            param['g1'], param['g2']: float

                Reduced weak lensing shear components (valid for shear type: catalog)

        the model of ObservationSim.MockObject.Galaxy class requires:

            Currently a Quasar is modeled as a point source, just like a Star.

        NOTE: To construct an object, according to its type, just call:

            Star(param), Galaxy(param), or Quasar(param)

        NOTE: All constructed objects should be appened to "self.objs".

        NOTE: Any other parameters can also be set within "param" dict:

            Used to calculate required quantities and/or SEDs etc.

        Parameters

        ----------

        **kwargs : dict

            other needed input parameters (in key-value pairs), please modify corresponding

            initialization call in "ObservationSim.py" as you need.

        Returns

        ----------

        None

        """

        stars = Table.read(self.star_path)

        nstars = stars['sourceID'].size

        for istars in range(nstars):

            param = self.initialize_param()

            param['id'] = istars + 1

            param['ra'] = stars['RA'][istars]

            param['dec'] = stars['Dec'][istars]

            param['sed_type'] = stars['sourceID'][istars]

            param['model_tag'] = stars['model_tag'][istars]

            param['z'] = 0.0

            param['star'] = 1   # Star

            param['mag_use_normal'] = stars['app_sdss_g'][istars]

            obj = Star(param)

            self.objs.append(obj)

    def load_sed(self, obj, **kwargs):

        """Load the corresponding SED data for a particular obj.

        Parameters

        ----------

        obj : ObservationSim.MockObject

            the object to get SED data for

        **kwargs : dict

            other needed input parameters (in key-value pairs), please modify corresponding

            initialization call in "ObservationSim.py" as you need.

        Returns

        ----------

        sed : Astropy.Table

            the SED Table with two columns (namely, "WAVELENGTH", "FLUX"):

                sed["WAVELENGTH"] : wavelength in Angstroms

                sed["FLUX"] : fluxes in photons/s/m^2/A

            NOTE: the range of wavelengthes must at least cover [2450 - 11000] Angstorms

        """

        if obj.type == 'star':

            wave = Table.read(self.star_SED_path, path=f"/SED/wave_{obj.model_tag}")

            flux = Table.read(self.star_SED_path, path=f"/SED/{obj.sed_type}")

            wave, flux = wave['col0'].data, flux['col0'].data

        else:

            raise ValueError("Object type not known")

        speci = interpolate.interp1d(wave, flux)

        lamb = np.arange(2400, 11001 + 0.5, 0.5)

        y = speci(lamb)

        # erg/s/cm^2/A --> photons/s/m^2/A

        all_sed = y * lamb / (cons.h.value * cons.c.value) * 1e-13

        sed = Table(np.array([lamb, all_sed]).T, names=('WAVELENGTH', 'FLUX'))

        return sed

    def load_norm_filt(self, obj):

        """Load the corresponding thourghput for the input magnitude "param["mag_use_normal"]".

        NOTE: if the input magnitude is already in CSST magnitude, simply return None

        Parameters

        ----------

        obj : ObservationSim.MockObject

            the object to get thourghput data for

        Returns

        ----------

        norm_filt : Astropy.Table

            the throughput Table with two columns (namely, "WAVELENGTH", "SENSITIVITY"):

                norm_filt["WAVELENGTH"] : wavelengthes in Angstroms

                norm_filt["SENSITIVITY"] : efficiencies

        """

        return None

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