Structural parameters and blue stragglers in Sagittarius dwarf spheroidal galaxy globular clusters

• Authors: SALINAS Ricardo; JÍLKOVÁ Lucie; CARRARO Giovanni; CATELAN Márcio; AMIGO Pía
• Year of publication: 2012
• Type: Article in Periodical
• Magazine / Source: Monthly Notices of the Royal Astronomical Society
• MU Faculty or unit: Faculty of Science
• Web: http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2966.2011.20354.x/full
• Doi: http://dx.doi.org/10.1111/j.1365-2966.2011.20354.x
• Field: Astronomy and astrophysics
• Keywords: blue stragglers; globular clusters; Arp 2; Terzan 8; NGC 5634; Palomar 12
• Description: We present BV photometry of four Sagittarius dwarf spheroidal galaxy globular clusters: Arp 2, NGC 5634, Palomar 12 and Terzan 8, obtained with the Danish Telescope at ESO La Silla. We measure the structural parameters of the clusters using a King profile fitting, obtaining the first reliable measurements of the tidal radius of Arp 2 and Terzan 8. These two clusters are remarkably extended and with low concentrations, with a concentration of only c=0.41+/-0.02, Terzan 8 is less concentrated than any cluster in our Galaxy.

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