Introduction¶
SELID produces a subsampled redshift catalogue that has exactly the same format as the input redshift catalogue, with added completeness and purity estimates.
The flowchart is the following:
Ideal Catalogue¶
This fits binary catalogue have synthetic objects with the same observational properties as in the real catalogue but without any observational selection effects, i.e. the ideal catalogue will describe our best knowledge of the properties and numbers of objects in the Universe. The deep survey might be used as a proxy.
The ideal catalogue will have the same columns as the real catalogue but independent IDs.
Random Catalogue¶
This FITS binary random catalogue will be a subsampled version of the ideal catalogue and will account for varying efficiency of detecting the objects by Euclid by VMSP-ID/VMPZ-ID (Output Product: Photometric Random Catalog or VMSPIDRandomCatalog).
The random catalogue will have the same columns as the ideal catalogue. The IDs will be a subset of the ones in the ideal catalogue.
Selection criteria file¶
This is an ASCII file with three columns. Each row corresponds to a single selection. The first column contains the name of the selection column in the catalogue .fits file, The second column contains the minimum value for that criterion, and the third column contains the maximum value. E.g. ‘z 0.5 0.7’ - will select all galaxies in the redshift range 0.5 <= z <= 0.7, and ‘FLUX_HA 1e-21 0’ - will select all galaxies with the HA flux of more than 1e-21. If the selection criterion can not be found in the .fits file the script issues a warning and ignores the criterion.