slsim.Sources.SourcePopulation package

Submodules

slsim.Sources.SourcePopulation.galaxies module

class slsim.Sources.SourcePopulation.galaxies.Galaxies(galaxy_list, kwargs_cut, cosmo, sky_area, list_type='astropy_table', catalog_type=None, downsample_to_dc2=False, source_size='Bernardi', extended_source_type='single_sersic', extendedsource_kwargs={})

Bases: SourcePopBase

Class describing elliptical galaxies.

draw_source(z_max=None, z_min=None, galaxy_index=None)

Choose source at random.

Parameters:

• z_max – maximum redshift limit for the galaxy to be drawn. If no galaxy is found for this limit, None will be returned.

• z_min – minimum redshift limit for the galaxy to be drawn. If no galaxy is found for this limit, None will be returned.

• galaxy_index – index of galaxy to pic (if provided)

Returns:

instance of Source class

draw_source_dict(z_max=None, z_min=None, galaxy_index=None)

Choose source at random.

Parameters:

• z_max – maximum redshift limit for the galaxy to be drawn. If no galaxy is found for this limit, None will be returned.

• z_min – minimum redshift limit for the galaxy to be drawn. If no galaxy is found for this limit, None will be returned.

• galaxy_index – index of galaxy to pic (if provided)

Returns:

dictionary of source

property source_number

Number of sources registered (within given area on the sky)

Returns:

number of sources

property source_number_selected

Number of sources selected (within given area on the sky)

Returns:

number of sources passing the selection criteria

slsim.Sources.SourcePopulation.galaxies.convert_to_slsim_convention(galaxy_catalog, light_profile, input_catalog_type='skypy', source_size=None, cosmo=None)

This function converts scotch/catalog to slsim conventions. In slsim, sersic index are either n_sersic or (n_sersic_0 and n_sersic_1). Ellipticity are either ellipticity or (ellipticity0 and ellipticity1). These kewords can be read by Galaxies class. This function is written to convert scotch catalog to slsim convension and to change unit of angular size in skypy source catalog to arcsec.

Parameters:

• galaxy_catalog (astropy Table object.) – An astropy table of galaxy catalog in other conventions.

• light_profile – keyword for number of sersic profile to use in source light model. accepted kewords: “single_sersic”, “double_sersic”.

• input_catalog_type (str. eg: "scotch" or "skypy".) – type of the catalog. If someone wants to use scotch catalog or skypy catalog, they need to specify it.

• source_size – Keyword for source size convention. If “Bernardi”, computes galaxy size using g-band magnitude otherwise rescales skypy source size to Shibuya et al.(2015): ht tps://iopscience.iop.org/article/10.1088/0067-0049/219/2/15/pdf

• cosmo – astropy.cosmology instance

Returns:

galaxy catalog in slsim convension.

slsim.Sources.SourcePopulation.galaxies.down_sample_to_dc2(galaxy_pop, sky_area)

Downsamples given galaxy pop above redshift 1.5 to DC2 galaxy population.

Parameters:

• galaxy_pop – Astropy table of galaxy population.

• sky_area – Sky area over which galaxies are sampled. Must be in units of solid angle and it should be astropy unit object.

• cosmo – astropy.cosmology instance

Returns:

Astropy tables of downsampled galaxy population in different bins. Redshift bins for returned populations are: (2-2.5), (2.5-3), (3-3.5), (3.5-4), (4-4.5), (4.5-5)

slsim.Sources.SourcePopulation.galaxies.galaxy_projected_eccentricity(ellipticity, rotation_angle=None)

Projected eccentricity of elliptical galaxies as a function of other deflector parameters.

Parameters:

• ellipticity (float [0,1)) – eccentricity amplitude

• rotation_angle – rotation angle of the major axis of elliptical galaxy in radian. The reference of this rotation angle is +Ra axis i.e towards the East direction and it goes from East to North. If it is not provided, it will be drawn randomly.

Returns:

e1, e2 eccentricity components

slsim.Sources.SourcePopulation.point_plus_extended_sources module

class slsim.Sources.SourcePopulation.point_plus_extended_sources.PointPlusExtendedSources(point_plus_extended_sources_list, cosmo, sky_area, kwargs_cut, list_type='astropy_table', catalog_type=None, source_size='Bernadi', point_source_type=None, extended_source_type=None, point_source_kwargs={}, extendedsource_kwargs={})

Bases: Galaxies, SourcePopBase

Class to describe point and extended sources.

draw_source(z_max=None)

Choose source at random.

Parameters:

z_max – maximum redshift limit for the galaxy to be drawn. If no galaxy is found for this limit, None will be returned.

Returns:

instance of Source class

slsim.Sources.SourcePopulation.point_sources module

class slsim.Sources.SourcePopulation.point_sources.PointSources(point_source_list, cosmo, sky_area, kwargs_cut, list_type='astropy_table', point_source_type=None, point_source_kwargs={})

Bases: SourcePopBase

Class to describe point sources.

draw_source()

Choose source at random with the selected range.

Returns:

dictionary of source

property source_number

Number of sources registered (within given area on the sky)

Returns:

number of sources

property source_number_selected

Number of sources selected (within given area on the sky)

Returns:

number of sources passing the selection criteria

slsim.Sources.SourcePopulation.source_pop_base module

class slsim.Sources.SourcePopulation.source_pop_base.SourcePopBase(cosmo, sky_area)

Bases: ABC

Base class with functions all source classes must have to be able to render populations.

abstract draw_source()

Choose source at random.

Returns:

dictionary of source

property kwargs_variability

Returns:

dict of keyword arguments for the variability model.

abstract property source_number

Number of sources registered (within given area on the sky)

Returns:

number of sources

abstract property source_number_selected

Number of sources selected (within given area on the sky)

Returns:

number of sources passing the selection criteria

property variability_model

Returns:

keyword for the variability model

Module contents