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

被引：34
作者：
Davies, Ben [1 ,2 ]
Bastian, Nate [3 ,4 ]
Gieles, Mark [4 ]
Seth, Anil C. [5 ]
Mengel, Sabine [6 ]
Konstantopoulos, Iraklis S. [7 ]
机构：
[1] Rochester Inst Technol, Rochester, NY 14623 USA
[2] Univ Leeds, Sch Phys & Astron, Leeds LS2 9JT, W Yorkshire, England
[3] Univ Exeter, Sch Phys, Exeter EX4 4QL, Devon, England
[4] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England
[5] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[6] European So Observ, D-85748 Garching, Germany
[7] Penn State Univ, Eberly Coll Sci, University Pk, PA 16802 USA
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2011年 / 411卷 / 02期
基金：
美国国家航空航天局; 美国国家科学基金会;
关键词：
techniques: spectroscopic; globular clusters: individual: GLIMPSE-C01; LARGE-MAGELLANIC-CLOUD; STAR-FORMATION HISTORY; GLOBULAR-CLUSTERS; RED SUPERGIANTS; MILKY-WAY; IDENTIFICATION; WESTERLUND-1; METALLICITY; POPULATIONS; DISRUPTION;
D O I：
10.1111/j.1365-2966.2010.17777.x
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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 disc, previous observations do not rule out that it is an intermediate-age (less than a few Gyr) disc-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 disc, and determine the cluster's dynamical mass to be (8 +/- 3) x 104 M-circle dot. 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 400-800 Myr for GLIMPSE-C01, much lower than that for a typical globular cluster. This evidence therefore leads us to conclude that GLIMPSE-C01 is a part of the disc population, and is the most massive Galactic intermediate-age cluster discovered to date.
引用
收藏
页码：1386 / 1394
页数：9
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