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http://dx.doi.org/10.5140/JASS.2017.34.2.83

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  

Han, Mihwa (Department of Astronomy, Yonsei University)
Chun, Sang-Hyun (Astronomy Program, Department of Physics and Astronomy, Seoul National University)
Choudhury, Samyaday (Department of Astronomy, Yonsei University)
Chiang, Howoo (Department of Astronomy, Yonsei University)
Lee, Sowon (Department of Astronomy, Yonsei University)
Sohn, Young-Jong (Department of Astronomy, Yonsei University)
Publication Information
Journal of Astronomy and Space Sciences / v.34, no.2, 2017 , pp. 83-97 More about this Journal
Abstract
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 $71^{\prime}{\times}71^{\prime}$ 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.
Keywords
Galaxy; bulge-Galaxy; structure-globular clusters; general-globular clusters; individual (NGC 6266, NGC 6273, NGC 6681);
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