4.7 Article

XGAPS: a sub-arcsec cross-match of galactic plane surveys

Journal

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 518, Issue 2, Pages 3137-3146

Publisher

OXFORD UNIV PRESS
DOI: 10.1093/mnras/stac3353

Keywords

catalogues; surveys; parallaxes; proper motions; stars: emission-line; Galaxy: stellar content

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This paper presents a sub-arcsec cross-match of Gaia DR3 with IGAPS and UKIDSS, resulting in a catalogue called XGAPS. The XGAPS catalogue provides additional precise photometry to Gaia photometry and has various applications, such as selecting Galactic targets for spectroscopic surveys and identifying specific Galactic populations.
We present a sub-arcsec cross-match of Gaia Data Release 3 (DR3) against the INT Galactic Plane Surveys (IGAPS) and the United Kingdom Infrared Deep Sky Survey (UKIDSS). The resulting cross-match of Galactic Plane Surveys (XGAPS) provides additional precise photometry (U-RGO, g, r, i, H alpha, J, H, and K) to the Gaia photometry. In building the catalogue, proper motions given in Gaia DR3 are wound back to match the epochs of the IGAPS constituent surveys (INT Photometric H alpha Survey of the Northern Galactic Plane, IPHAS, and the UV-Excess Survey of the Northern Galactic Plane, UVEX) and UKIDSS, ensuring high-proper motion objects are appropriately cross-matched. The catalogue contains 33987180 sources. The requirement of >3 sigma parallax detection for every included source means that distances out to 1-1.5kpc are well covered. In producing XGAPS, we have also trained a Random Forest classifier to discern targets with problematic astrometric solutions. Selection cuts based on the classifier results can be used to clean colour-magnitude and colour-colour diagrams in a controlled and justified manner, as well as producing subsets of astrometrically reliable targets. We provide XGAPS as a 111 column table. Uses of the catalogue include the selection of Galactic targets for multi-object spectroscopic surveys as well as identification of specific Galactic populations.

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