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

Mihwa Han, Sang Hyun Chun, Samyaday Choudhury, Howoo Chiang, Sowon Lee, Young-Jong Sohn

Research output: Contribution to journalArticle

1 Citation (Scopus)

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'×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.

Original languageEnglish
Pages (from-to)83-97
Number of pages15
JournalJournal of Astronomy and Space Sciences
Volume34
Issue number2
DOIs
Publication statusPublished - 2017 Jun 1

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globular clusters
diagram
stars
metal
profiles
configurations
metals
color-magnitude diagram
galactic bulge
radii
star distribution
contamination
cameras
telescopes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Earth and Planetary Sciences(all)

Cite this

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title = "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",
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'×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.",
author = "Mihwa Han and Chun, {Sang Hyun} and Samyaday Choudhury and Howoo Chiang and Sowon Lee and Young-Jong Sohn",
year = "2017",
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language = "English",
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journal = "Journal of Astronomy and Space Science",
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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; Chun, Sang Hyun; Choudhury, Samyaday; Chiang, Howoo; Lee, Sowon; Sohn, Young-Jong.

In: Journal of Astronomy and Space Sciences, Vol. 34, No. 2, 01.06.2017, p. 83-97.

Research output: Contribution to journalArticle

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AB - 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.

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