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GLIMPSE-CO1: the most massive intermediate-age stellar cluster in the Galaxy

Davies, B, Bastian, N, Gieles, M, Seth, AC, Mengel, S and Konstantopoulos, IS (2010) GLIMPSE-CO1: the most massive intermediate-age stellar cluster in the Galaxy Monthly Notices of the Royal Astronomical Society.

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The stellar cluster GLIMPSE-C01 is a dense stellar system located in the Galactic Plane. Though often referred to in the literature as an old globular cluster traversing the Galactic disk, previous observations do not rule out that it is an intermediate age (less than a few Gyr) disk-borne cluster. Here, we present high-resolution near-infrared spectroscopy of over 50 stars in the cluster. We find an average radial velocity is consistent with being part of the disk, and determine the cluster's dynamical mass to be (8 \pm 3)x10^4 Msun. Analysis of the cluster's M/L ratio, the location of the Red Clump, and an extremely high stellar density, all suggest an age of 400-800Myr for GLIMPSE-C01, much lower than for a typical globular cluster. This evidence therefore leads us to conclude that GLIMPSE-C01 is part of the disk population, and is the most massive Galactic intermediate-age cluster discovered to date.

Item Type: Article
Divisions : Surrey research (other units)
Authors :
Davies, B
Bastian, N
Seth, AC
Mengel, S
Konstantopoulos, IS
Date : 14 October 2010
DOI : 10.1111/j.1365-2966.2010.17777.x
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 12:40
Last Modified : 24 Jan 2020 22:39

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