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dc.contributor.authorWilson, Tom
dc.contributor.authorNaylor, Tim
dc.date.accessioned2018-08-28T12:58:21Z
dc.date.issued2018-08-28
dc.date.updated2018-08-21T14:25:10Z
dc.description.abstractFaint, hidden contaminants in the point-spread functions (PSFs) of stars cause shifts to their measured positions. Wilson & Naylor (2017) showed failing to account for these shifts can lead to a drastic decrease in the number of returned catalogue matches in crowded fields. Here we highlight the effect these perturbations have on cross-matching, for matches between Gaia DR2 and WISE stars in a crowded Galactic plane region. Applying the uncertainties as quoted to Gaussian-based astrometric uncertainty functions (AUFs) can lead, in dense Galactic fields, to only matching 55% of the counterparts. We describe the construction of empirical descriptions for AUFs, building on the cross-matching method of Wilson & Naylor (2018), utilising the magnitudes of both catalogues to discriminate between true and false counterparts. We apply the improved cross-matching method to the Galactic plane |b| ≤ 10. We provide the most likely counterpart matches and their respective probabilities. We also analyse several cases to verify the robustness of the results, highlighting some important caveats and considerations. Finally, we discuss the effect PSF resolution has by comparing the intra-catalogue nearest neighbour separation distributions of a sample of likely contaminated WISE objects and their corresponding Spitzer counterpart. We show that some WISE contaminants are resolved in Spitzer, with smaller intra-catalogue separations. We have highlighted the effect contaminant stars have on WISE, but it is important for all photometric catalogues, playing an important role in the next generation of surveys, such as LSST.en_GB
dc.description.sponsorshipTJW acknowledges support from an STFC Studentship. TN is funded by a Leverhulme Trust Research Project Grant. Ten_GB
dc.identifier.doi10.24378/exe.629
dc.identifier.urihttp://hdl.handle.net/10871/33826
dc.language.isoenen_GB
dc.publisherUniversity of Exeteren_GB
dc.relation.sourceAllWISE: https://irsa.ipac.caltech.edu/cgi-bin/Gator/nph-scan?submit=Select&projshort=WISEen_GB
dc.relation.sourceGaia DR2: https://gea.esac.esa.int/archive/en_GB
dc.relation.urlhttp://hdl.handle.net/10871/33934
dc.rightsCC BY 4.0en_GB
dc.subjecttechniques: photometricen_GB
dc.subjectcataloguesen_GB
dc.subjectstars: statisticsen_GB
dc.subjectastrometryen_GB
dc.subjectsurveysen_GB
dc.subjectmethods: statisticalen_GB
dc.titleA contaminant-free catalogue of Gaia DR2-WISE Galactic Plane matches: including the effects of crowding in the cross-matching of photometric catalogues (dataset)en_GB
dc.typeDataseten_GB
dc.date.available2018-08-28T12:58:21Z
dc.descriptionSource IDs, Positions, Magnitudes, Cross-match probability, and WISE contamination probability and flux levels for all Gaia-WISE matches in the Galactic plane, |b| < 10en_GB
dc.descriptionThe article associated with this dataset is located in ORE at: http://hdl.handle.net/10871/33934
dc.identifier.journalMonthly Notices of the Royal Astronomical Societyen_GB
dc.rights.urihttp://creativecommons.org/licenses/by/4.0


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