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Outer density profiles of 19 Galactic globular clusters from deep and wide-field imaging

Carballo-Bello, JA, Gieles, M, Sollima, A, Koposov, S, Martínez-Delgado, D and Peñarrubia, J (2011) Outer density profiles of 19 Galactic globular clusters from deep and wide-field imaging Monthly Notices of the Royal Astronomical Society.

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Using deep photometric data from WFC@INT and WFI@ESO2.2m we measure the outer number density profiles of 19 stellar clusters located in the inner region of the Milky Way halo (within a Galactocentric distance range of 10-30 kpc) in order to assess the impact of internal and external dynamical processes on the spatial distribution of stars. Adopting power-law fitting templates, with index $-\gamma$ in the outer region, we find that the clusters in our sample can be divided in two groups: a group of massive clusters ($ \ge 10^5 $ M_sun) that has relatively flat profiles with $2.5 < \gamma < 4$ and a group of low-mass clusters ($ \le 10^5 $ M_sun), with steep profiles ($\gamma > 4$) and clear signatures of interaction with the Galactic tidal field. We refer to these two groups as 'tidally unaffected' and 'tidally affected', respectively. Our results also show a clear trend between the slope of the outer parts and the half-mass density of these systems, which suggests that the outer density profiles may retain key information on the dominant processes driving the dynamical evolution of Globular Clusters.

Item Type: Article
Divisions : Surrey research (other units)
Authors :
Carballo-Bello, JA
Sollima, A
Koposov, S
Martínez-Delgado, D
Peñarrubia, J
Date : 19 August 2011
DOI : 10.1111/j.1365-2966.2011.19663.x
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 12:40
Last Modified : 24 Jan 2020 22:38

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