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Discovery of a New Low-Latitude Milky Way Globular Cluster Using GLIMPSE


Kobulnicky, HA and Monson, AJ and Buckalew, BA and Darnel, JM and Uzpen, B and Meade, MR and Babler, BL and Indebetouw, R and Whitney, BA and Watson, C and Churchwell, E and Wolfire, MG and Wolff, MJ and Clemens, DP and Shah, R and Bania, TM and Benjamin, RA and Cohen, M and Dickey, JM and Jackson, JM and Marston, AP and Mathis, JS and Mercer, EP and Stauffer, JR and Stolovy, SR and Norris, JP and Kutyrev, A and Canterna, R and Pierce, MJ, Discovery of a New Low-Latitude Milky Way Globular Cluster Using GLIMPSE, The Astronomical Journal, 129, (1) pp. 239-250. ISSN 0004-6256 (2005) [Refereed Article]

DOI: doi:10.1086/426337


Spitzer Space Telescope imaging from the Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE) reveals a previously unidentified low-latitude rich star cluster near l = 31°.3, b = -0°.1. Near-infrared JHK′ photometry from the Wyoming Infrared Observatory indicates an extinction of A v ≃ 15 ± 3 mag for cluster members. Analysis of 13CO features along the same sight line suggests a probable kinematic distance of 3.1-5.2 kpc. The new cluster has an angular diameter of ∼ 1-2 pc, a total magnitude corrected for extinction of m K0 = 2.1, and a luminosity of M K ≃ -10.3 at 3.1 kpc. In contrast to young massive Galactic clusters with ages less than 100 Myr, the new cluster has no significant radio emission. Comparison with theoretical K-band luminosity functions indicates an age of at least several gigayears and a mass of at least 10 5 M⊙. Unlike known old open clusters, this new cluster lies in the inner Galaxy at R GC ≃ 6.1 kpc. We designate this object "GLIMPSE-C01" and present evidence that it is a Milky Way globular cluster passing through the Galactic disk. We also identify a region of star formation and fan-shaped outflows from young stellar objects in the same field as the cluster. The cluster's passage through the Galactic molecular layer may have triggered this star formation activity. © 2005. The American Astronomical Society. All rights reserved.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Dickey, JM (Professor John Dickey)
ID Code:35955
Year Published:2005
Web of Science® Times Cited:37
Deposited By:Physics
Deposited On:2006-01-10
Last Modified:2011-11-28

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