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| Paper: |
Rule-based Cross-matching of Very Large Catalogs |
| Volume: |
495, Astronomical Data Analysis Software and Systems XXIV (ADASS XXIV) |
| Page: |
25 |
| Authors: |
Ogle, P. M.; Mazzarella, J.; Ebert, R.; Fadda, D.; Lo, T.; Terek, S.; Schmitz, M.; NED Team |
| Abstract: |
The NASA Extragalactic Database (NED) has deployed a new rule-based cross-matching algorithm called Match Expert (MatchEx), capable of cross-matching
very large catalogs (VLCs) with >10 million objects. MatchEx goes beyond traditional position-based cross-matching algorithms by using
other available data together with expert logic to determine which candidate match is the best. Furthermore, the local background
density of sources is used to determine and minimize the false-positive match rate and to estimate match completeness. The
logical outcome and statistical probability of each match decision is stored in the database and may be used to tune the algorithm and
adjust match parameter thresholds. For our first production run, we cross-matched the GALEX All Sky Survey Catalog (GASC), containing
nearly 40 million NUV-detected sources, against a directory of 180 million objects in NED. Candidate matches were identified for each
GASC source within a 7''.5 radius. These candidates were filtered on position-based matching probability and on other criteria
including object type and object name. We estimate a match completeness of 97.6% and a match accuracy of 99.75%. Over the next year,
we will be cross-matching over 2 billion catalog sources to NED, including the Spitzer Source List, the 2MASS point-source catalog,
AllWISE, and SDSS DR 10. We expect to add new capabilities to filter candidate matches based on photometry, redshifts, and refined object
classifications. We will also extend MatchEx to handle more heterogenous datasets federated from smaller catalogs through NED's literature
pipeline. |
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