07-MeasureSpectroscopicRedshift¶
Input data¶
| path name |
type |
unit |
description |
| /gal/galaxy_index |
int array |
none |
unique galaxy indentifier according to the initial catalog used |
| /gal/fiber_selection_flag |
bool array |
none |
has the galaxy been observed, i. e. has it been assigned to a fiber? |
| /gal/redshift_photometric |
float array |
none |
redshift z as estimated from photometry (magnitudes) |
kcorrect templates
The galaxy spectra are not read in as a giant array, but are being generated on-the-fly. That is why they don't figure as input data.
Parameters¶
| name |
type |
description |
| use_true_redshift |
bool |
for testing: just pass the true redshift to the cosmology module |
| min_template_wavelength |
float |
how far down can we trust the template spectra? (in Angstroem) the farther down, the higher redshifts we can determine |
| number_of_bins |
int |
how fine should be logarithmic wavelength grid be? The finer, the more precise the redshift, but the longer it takes to compute |
| smoothing_length |
float |
for continuum subtraction (after rebinning to log scale). Given as a ratio of the number of bins |
Output data¶
| path name |
type |
unit |
description |
| /gal/redshift_spectroscopic_spokes |
float array |
none |
the redshift of the fiber selected galaxies. NB this array is shorter than the original catalog |
Algorithm¶