Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.259..413s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 259, no. 3, p. 413-420.
Astronomy and Astrophysics
Astronomy
138
Likelihood Ratio, Radio Astronomy, Radio Galaxies, Radio Sources (Astronomy), Identifying, Sky Surveys (Astronomy)
Scientific paper
The general use of the likelihood ratio technique for source identification as applied to, for example, IRAS galaxies and radio sources, is discussed. This method is an optimal technique for source identification as long as the prior distributions of source magnitudes and position errors are moderately well known from other work, or can be estimated from the data using a control sample. A self-consistent formula is derived for identification reliability; it is shown to be exact where the prior is well known, and deals correctly with the case of multiple candidates. The discrepancies with previous work, due in general to calculating p(X/A) when in fact p(X/A,B) is implicitly meant, is explained. It is recommended that this method be treated as an adjunct to spectroscopic identifications rather than a substitute. When the reliability estimates are used, it is possible to optimize the efficiency of such identifications with minimum wastage of scarce telescope time.
Saunders Will
Sutherland Will
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