schechter_smf_redshift

skypy.galaxies.redshift.schechter_smf_redshift(redshift, m_star, phi_star, alpha, m_min, m_max, sky_area, cosmology, noise=True)[source] [edit on github]

Sample redshifts from Schechter function.

Sample the redshifts of galaxies following a Schechter function with potentially redshift-dependent parameters, limited by stellar masses m_max and m_min, for a sky area sky_area.

Parameters
redshiftarray_like

Input redshift grid on which the Schechter function parameters are evaluated. Galaxies are sampled over this redshift range.

m_stararray_like or function

Characteristic stellar mass of the Schechter function. Can be a single value, an array of values for each redshift, or a function of redshift.

phi_stararray_like or function

Normalisation of the Schechter function. Can be a single value, an array of values for each redshift, or a function of redshift.

alphaarray_like or function

Schechter function power law index. Can be a single value, an array of values for each redshift, or a function of redshift.

m_minfloat

Minimum stellar mass.

m_maxfloat

Maximum stellar mass.

sky_areaQuantity

Sky area over which galaxies are sampled. Must be in units of solid angle.

cosmologyCosmology

Cosmology object to convert comoving density.

noisebool, optional

Poisson-sample the number of galaxies. Default is True.

Returns
redshiftsarray_like

Redshifts of the galaxy sample described by the Schechter function.