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The extended stellar substructures of four metal-poor globular clusters in the Galactic bulge

Published online by Cambridge University Press:  09 May 2016

Sang-Hyun Chun  and
Young-Jong Sohn
Sang-Hyun Chun
Affiliation:
Yonsei University Observatory, 120-749 Seoul, Korea email: shchun@galaxy.yonsei.ac.kr
Young-Jong Sohn
Affiliation:
Department of Astronomy, Yonsei University, 120-749, Seoul, Korea email: sohnyj@yonsei.ac.kr
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Abstract

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We investigated the stellar density substructures around four metal-poor globular clusters (NGC 6266, NGC 6626, NGC 6642, and NGC 6723) in the Galactic bulge. Wide-field near-infrared (JHKs) imaging data were obtained from WFCAM of UKIRT telescope. Field stars contamination around the globular clusters was reduced by using a statistical weighted filtering algorithm. Tidal stripping stellar substructures in the form of tidal tail (NGC 6266 and NGC 6626) or small density lobes/chunk (NGC 6642 and NGC 6723) were found around the four globular clusters in the two-dimensional density contour maps. We also find the overdensity features, which deviate from the theoretical models, in the outer region of radial density profiles. The observed results imply that the four globular clusters have experienced a strong tidal force or the bulge/disk shock effect of the Galaxy.

Keywords

Globular clustersTidal tail
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Issue S317: The General Assembly of Galaxy Halos: Structure, Origin and Evolution , August 2015 , pp. 286 - 287
Copyright
Copyright © International Astronomical Union 2016 

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