Calculating proper motions in the WFCAM Science Archive for UKIDSS

Ross Collins (WFAU, Institute for Astronomy, University of Edinburgh), Ross Collins (WFAU, Institute for Astronomy, University of Edinburgh), Nigel Hambly (WFAU, Institute for Astronomy, University of Edinburgh)


Abstract

The ninth data release from the UKIRT Infrared Deep Sky Surveys (UKIDSS DR9) represents five years worth of observations by its wide-field camera (WFCAM) and will be the first to include proper motion values in its source catalogues for the shallow, wide-area surveys; the Large Area Survey (LAS), Galactic Clusters Survey (GCS) and Galactic Plane Survey (GPS). We, the Wide-Field Astronomy Unit (WFAU) at the University of Edinburgh who prepare these regular data releases in the WFCAM Science Archive (WSA), describe in this poster how we make optimal use of the individual detection catalogues from each observation to derive high-quality astrometric fits for the positions of each detection enabling us to calculate a proper motion solution across multiple epochs and passbands when constructing a merged source catalogue. We also describe how the proper motion solutions affect the calculation of the various attributes provided in the database source catalogue tables, what measures of data quality we provide and the generalised results of this calculation across the surveys.

Paper ID: P025

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