The Panchromatic Hubble Andromeda Treasury XXI. The Legacy Resolved Stellar Photometry Catalog
Benjamin F. Williams, Meredith Durbin, Dustin Lang, Julianne J., Dalcanton, Andrew E. Dolphin, Adam Smercina, Petia Yanchulova Merica-Jones,, Daniel R. Weisz, Eric F. Bell, Karoline M. Gilbert, Leo Girardi, Karl Gordon,, Puragra Guhathakurta, L. Clifton Johnson, Tod R. Lauer

TL;DR
This paper presents a comprehensive, improved stellar photometry catalog for the PHAT survey, enhancing data quality and coverage, and providing detailed stellar population maps of Andromeda.
Contribution
The authors reprocessed the entire PHAT dataset using an advanced method that improves depth, coverage, and photometry reliability, resulting in a larger, more accurate star catalog.
Findings
138 million stars cataloged, 18% more than before
Enhanced survey depth and coverage with better CTE correction
More detailed and cleaner stellar population maps
Abstract
We present the final legacy version of stellar photometry for the Panchromatic Hubble Andromeda Treasury (PHAT) survey. We have reprocessed all of the Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) and Advanced Camera for Surveys (ACS) near ultraviolet (F275W, F336W), optical (F475W, F814W), and near infrared (F110W, F160W) imaging from the PHAT survey using an improved method that optimized the survey depth and chip gap coverage by including all overlapping exposures in all bands in the photometry. An additional improvement was gained through the use of charge transfer efficiency (CTE) corrected input images, which provide more complete star finding as well as more reliable photometry for the NUV bands, which had no CTE correction in the previous version of the PHAT photometry. While this method requires significantly more computing resources and time than earlier versions…
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Taxonomy
TopicsCCD and CMOS Imaging Sensors · Stellar, planetary, and galactic studies · Astronomy and Astrophysical Research
