Blanco DECam Bulge Survey (BDBS). VI. Extinction Maps Toward Southern Galactic Bulge Globular Clusters
Blanco DECam Bulge Survey (BDBS). VI. Extinction Maps Toward Southern Galactic Bulge Globular Clusters
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DOI：
10.3847/1538-4357/acc79e
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发表时间：
2023-06
期刊：
影响因子：
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通讯作者：
Justin A. Kader;C. Pilachowski;Christian I. Johnson;R. Rich;M. Young;I. Simion;W. Clarkson;S. Mich
中科院分区：
文献类型：
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作者：
Justin A. Kader;C. Pilachowski;Christian I. Johnson;R. Rich;M. Young;I. Simion;W. Clarkson;S. Mich
我们目前的宽视场，高分辨率的地图的颜色过剩的14个球状星团对南银河系的隆起。这些地图是使用盖亚EDR 3天体测量和来自布兰科DECam隆起巡天的恒星测光得出的，DECam隆起巡天是对银河系南部隆起进行的一次深、宽视场ugrizY测光巡天。与WISE 12 μm热连续辐射图像的比较表明，这里提供的地图跟踪星际消光的尘埃下降到5″尺度。我们使用适当的运动选择的星团恒星的红校正测光，以建立目标球状星团的颜色星等图，这表明剩余的增宽超过预期的测光误差。这种残余的加宽很可能是由恒星与星星之间的元素丰度变化所驱动的。
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-field ugrizY photometric survey of the southern Galactic bulge. Comparisons with WISE 12 μm 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.