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Paper: The Hubble Source Catalog
Volume: 495, Astronomical Data Analysis Software and Systems XXIV (ADASS XXIV)
Page: 65
Authors: Lubow, S.; Allam, S.; Budavari, T.; Quick, L.; Strolger, L.; White, R. L.; Whitmore, B.
Abstract: We have continued development of the Hubble Source Catalog (HSC). The catalog was initially based on Hubble Space Telescope (HST) observations taken with the ACS/WFC and WFPC2 detectors. We have recently added observations from the WFC3/IR and WFC3/UVIS detectors. The catalog is available as a Beta 0.3 release at The catalog is produced by cross matching by position in the sky the Hubble Legacy Archive (HLA) Source Extractor source lists for these detectors using algorithms described in Budavári & Lubow (2012). The source lists describe properties of source detections within an HST visit (pointing). To carry out the cross matching, we improve the astrometry for the source lists. To do this, we first use a histogram method for cross matching the brightest sources against the Pan-STARRS, SDSS, and 2MASS catalogs. To further improve the alignment, we apply a different method that is highly efficient for approximately aligned source lists (less than a few tenths of an arc-sec). With that method, we cross match the brightest sources in overlapping source lists against each other and adjust the source list astrometry to minimize the offsets of matched sources. All the sources in the overlapping source lists are then cross matched to produce the HSC. The HSC provides time and muti-wavelength information. We have carried out some preliminary investigations of its capabilities through some use cases.
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