Blanco DECam Bulge Survey (BDBS). VI. Extinction Maps Toward Southern Galactic Bulge Globular Clusters

Kader, Justin A.; Pilachowski, Catherine A.; Johnson, Christian I.; Rich, R. Michael; Young, Michael D.; Simion, Iulia T.; Clarkson, William I.; Michael, Scott; Kunder, Andrea; Vivas, Anna Katherina; Koch-Hansen, Andreas J.; Marchetti, Tommaso

doi:10.3847/1538-4357/acc79e

Blanco DECam Bulge Survey (BDBS). VI. Extinction Maps Toward Southern Galactic Bulge Globular Clusters

Journal Article · 01 June 2023 · The Astrophysical Journal

DOI:https://doi.org/10.3847/1538-4357/acc79e· OSTI ID:2424725

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Abstract

We present wide-field, high resolution maps of the color excess for 14 globular clusters toward the Southern Galactic bulge. The maps were derived using Gaia EDR3 astrometry and stellar photometry from the Blanco DECam Bulge Survey, which is a deep, wide-fieldugrizY photometric survey of the southern Galactic bulge. Comparisons with WISE 12μm images of thermal continuum emission demonstrate that the maps presented here trace interstellar extinction by dust down to 5″ scales. We use the reddening-corrected photometry of proper motion-selected cluster stars to build color–magnitude diagrams for the target globular clusters, which show residual broadening in excess of that expected from the photometric errors alone. This residual broadening is likely to be driven by star-to-star elemental abundance variations.

Research Organization:: US Department of Energy (USDOE), Washington, DC (United States). Dark Energy Survey (DES) Collaboration

Sponsoring Organization:: USDOE

OSTI ID:: 2424725

Journal Information:: The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 2 Vol. 950; ISSN 0004-637X

Publisher:: IOP Publishing

Country of Publication:: United States

Language:: English

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