sheap.Utils.extras.can_be_usefull module

This module handles basic operations.

build_cube_from_fits_header_comments(template_dir, output_file='miles_cube_log.npz', log_age_bins=None, z_bins=None)[source]

Read MILES-like template FITS files, build a (n_Z, n_age, n_pix) cube on a log-lambda grid, resample all templates to the max FWHM, and save as constant-resolution .npz.

Parameters:

  • template_dir (str)

  • output_file (str)

  • log_age_bins (int)

  • z_bins (int)

Return type:

Tuple[ndarray, ndarray, ndarray, ndarray]

resample_to_log_lambda_npinterp(wave, flux, wdisp_kms, npix=None)[source]

Resample a linearly spaced spectrum to a log(λ) grid using numpy.interp.

Parameters:

  • wave (ndarray) – Original wavelength array in Ångstroms (linearly spaced).

  • flux (ndarray) – Flux array (same length as wave).

  • wdisp_kms (float) – Instrumental dispersion in km/s (σ).

  • npix (int, optional) – Number of output pixels. Defaults to len(wave).

Returns:

  • wave_log (ndarray) – Logarithmically spaced wavelength array.

  • flux_log (ndarray) – Resampled flux on log(λ) grid.

  • velscale (float) – Velocity scale in km/s per pixel.

  • fwhm_lambda (ndarray) – FWHM in Ångstroms at each pixel.

Return type:

Tuple[ndarray, ndarray, float, ndarray]