文章基本信息

标题：Spatial Configuration of Stars Around Three Metal-poor Globular Clusters in the Galatic Bulge, NGC 6266, NGC 6273, and NGC 6681 Surface Density Map and Radial Density Profile
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作者：Mihwa Han ; Sang-Hyun Chun ; Samyaday Choudhury 等
期刊名称：Journal of Astronomy and Space Sciences
印刷版ISSN：2093-5587
电子版ISSN：2093-1409
出版年度：2017
卷号：34
期号：2
页码：83-97
DOI：10.5140/JASS.2017.34.2.83
语种：English
出版社：Korean Space Science Society
摘要：We present extra-tidal features of spatial configuration of stars around three metal-poor globular clusters (NGC 6266, NGC 6273, NGC 6681) located in the Galactic bulge. The wide-field photometric data were obtained in BVI bands with the MOSAIC II camera at CTIO 4 m Blanco telescope. The derived color-magnitude diagrams (CMDs) contain stars in a total 71´×71´area including a cluster and its surrounding field outside of the tidal radius of the cluster. Applying statistical filtering technique, we minimized the field star contaminations on the obtained cluster CMDs and extracted the cluster members. On the spatial stellar density maps around the target clusters, we found overdensity features beyond the tidal radii of the clusters. We also found that the radial density profiles of the clusters show departures from the best-fit King model for their outer regions which support the overdensity patterns.
关键词：Galaxy;bulge-Galaxy;structure-globular clusters;general-globular clusters;individual (NGC 6266; NGC 6273; NGC 6681)