IsolatedStarAssociationTask

IsolatedStarAssociationTask matches unresolved star sources from the sourceTable_visit datasets into a pure (but not complete) catalog of isolated stars. The output datasets are a catalog of isolated stars (dataset isolated_star_cat) and the associated sources with configured columns from the input catalogs (dataset isolated_star_sources).

Processing summary

IsolatedStarAssociationTask reads in all the visit-level source table parquet catalogs in a given tract and matches (associates) the sources together. In particular:

• All sourceTable_visit catalogs overlapping a given tract are used as inputs. The configuration variable extra_columns can be used to specify which columns from the inputs are persisted (in addition to the default flux column, input row number, and source id).

• Unflagged, unresolved stars above a configured signal-to-noise are selected from each input catalog.

• The input stars are associated within a configured match_radius arcseconds. This association is done band-by-band (with the order configured by band_order), and then each band is matched such that all sources are associated with a unique list of stars which cover all the bands in the tract.

• The star catalog is matched against itself, and groups of stars that match neighbor(s) within isolation_radius arcseconds are removed from the final isolated star catalog (isolated_star_cat).

• All individual sources are associated with the isolated star catalog within match_radius, to create the isolated_star_sources.

• The data are collated such that each isolated star has an index to the isolated_star_sources table for quick access of all the individual sources for that star.

Python API summary

Retargetable subtasks

Configuration fields