synthesizer.parametric.galaxy¶

A submodule defining a parametric galaxy object.

This module defines a parametric galaxy object, which is a subclass of the BaseGalaxy class. The parametric galaxy object is used to represent a galaxy comprised of parametric components.

Example usage:

from synthesizer.parametric import Galaxy

# Create a parametric galaxy object galaxy = Galaxy(stars=stars, black_holes=black_holes, redshift=0.1)

# Get the galaxies spectra spectra = galaxy.get_spectra(model)

# Get the ionising photon luminosity for a given SFZH ionising_photon_luminosity = galaxy.get_Q(grid)

# Create a spectral cube from the galaxy’s spectra spectral_cube = galaxy.get_data_cube(resolution=0.1, fov=10, lam=lam)

# Add two parametric galaxies together new_galaxy = galaxy1 + galaxy2

Classes

class synthesizer.parametric.galaxy.Galaxy(stars=None, name='parametric galaxy', black_holes=None, redshift=None, centre=None, **kwargs)[source]¶

A class defining parametric galaxy objects.

This class is a subclass of the BaseGalaxy class and is used to represent a galaxy comprised of parametric components. The class provides methods for creating and manipulating parametric galaxies, including adding galaxies together, getting spectra, and creating spectral cubes.

stars¶

An instance of Stars containing the combined star formation and metallicity history of this galaxy.

Type:: Stars

name¶

A name to identify the galaxy. Only used for external labelling, has no internal use.

Type:: str

redshift¶

The redshift of the galaxy.

Type:: float

centre¶

The centre of the galaxy.

Type:: unyt_array

black_holes¶

An instance of BlackHole containing the black hole particle data.

Type:: BlackHole

get_data_cube(fov, instrument, label=None, stellar_spectra=None, blackhole_spectra=None, quantity='lnu')[source]¶

Make a SpectralCube from an Sed.

Data cubes are calculated by smoothing spectra over the component morphology. The Sed used is defined by <component>_spectra.

If multiple components are requested they will be combined into a single output data cube.

NOTE: Either npix or fov must be defined.

Parameters:

fov (unyt_quantity of float) – The width of the image in image coordinates.
instrument (IntegratedFieldUnit) – The instrument to use for the data cube.
label (str) – A saved spectrum label to resolve across attached components.
stellar_spectra (str) – The stellar spectra key to make into a data cube.
blackhole_spectra (str) – The black hole spectra key to make into a data cube.
quantity (str) – The Sed attribute/quantity to sort into the data cube, i.e. “lnu”, “llam”, “luminosity”, “fnu”, “flam” or “flux”.

Returns:

SpectralCube: The spectral data cube object containing the derived data cube.