calculate_birth_redshift_array module

Module for calculating origin redshift arrays.

This module provides functions for calculating the redshift at the origin (birth) of stellar systems or events, based on their current redshift and delay times.

syntheticstellarpopconvolve.calculate_birth_redshift_array.calculate_origin_redshift_array(config, convolution_redshift_value, data_dict)

Calculate the birth redshift array for merging/formation events.

This function computes the origin (birth) redshift of stellar systems or events by: - Calculating the lookback time (age of the universe at the current redshift). - Adding the delay time (time between formation and the event) to the lookback time. - Converting the resulting birth time back to redshift using cosmological parameters.

Parameters:

• config (dict): Configuration dictionary containing:

  • “logger”: Logger object for debug information.

  • “cosmology”: Astropy cosmology object for calculations.

  • “redshift_interpolator_max_redshift”: Maximum redshift for the interpolator.

  • “interpolators”: Dictionary with “lookback_time_to_redshift_interpolator” for conversions.

• convolution_redshift_value (float): The current redshift value for convolution.

• data_dict (dict): Dictionary containing event data, including:

  • “delay_time”: Astropy Quantity array of delay times (time between formation and event).

Returns: - origin_redshift_values (np.ndarray): Array of calculated birth redshifts for the events.

Values outside the valid range are set to -1.

Example: ```python config = {

“logger”: logger, “cosmology”: cosmology, “redshift_interpolator_max_redshift”: 10.0, “interpolators”: {

“lookback_time_to_redshift_interpolator”: interpolator

},

} convolution_redshift_value = 0.5 data_dict = {“delay_time”: np.array([1.0, 2.0]) * u.Gyr} birth_redshifts = calculate_origin_redshift_array(config, convolution_redshift_value, data_dict) ```