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

Henry A. Kobulnicky | Zendy; Andy Monson | Zendy; B. Buckalew | Zendy; Jonathan Darnel | Zendy; B. Uzpen | Zendy; M. R. Meade | Zendy; B. Babler | Zendy; R. Indebetouw | Zendy; B. A. Whitney | Zendy; C. Watson | Zendy; E. Churchwell | Zendy; M. G. Wolfire | Zendy; M. J. Wolff | Zendy; D. P. Clemens | Zendy; R. Y. Shah | Zendy; T. M. Bania | Zendy; Robert A. Benjamin | Zendy; Martin Cohen | Zendy; J. M. Dickey | Zendy; James M. Jackson | Zendy; A. P. Marston | Zendy; J. S. Mathis | Zendy; E. P. Mercer | Zendy; J. R. Stauffer | Zendy; S. Stolovy | Zendy; J. P. Norris | Zendy; A. Kutyrev | Zendy; R. Canterna | Zendy; Michael Pierce | Zendy

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

Author(s) -

Henry A. Kobulnicky,

Andy Monson,

B. Buckalew,

Jonathan Darnel,

B. Uzpen,

M. R. Meade,

B. Babler,

R. Indebetouw,

B. A. Whitney,

C. Watson,

E. Churchwell,

M. G. Wolfire,

M. J. Wolff,

D. P. Clemens,

R. Y. Shah,

T. M. Bania,

Robert A. Benjamin,

Martin Cohen,

J. M. Dickey,

James M. Jackson,

A. P. Marston,

J. S. Mathis,

E. P. Mercer,

J. R. Stauffer,

S. Stolovy,

J. P. Norris,

A. Kutyrev,

R. Canterna,

Michael Pierce

Publication year - 2004

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/426337

Subject(s) - physics , astrophysics , globular cluster , milky way , astronomy , star cluster , open cluster , galactic plane , galaxy , galactic center , star formation , stars

Spitzer Space Telescope imaging as part of the Galactic Legacy Mid-PlaneSurvey Extraordinaire (GLIMPSE) reveals a previously unidentified low-latituderich star cluster near l=31.3 degrees, b=-0.1 degrees. 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 samesightline suggests a probable kinematic distance of 3.1 -- 5.2 kpc. The newcluster has an angular diameter of ~1-2 pc, a total magnitude m_{K_0}=2.1corrected for extinction, and a luminosity of M_K ~ -10.3 at 3.1 kpc. Incontrast to young massive Galactic clusters with ages <100 Myr, the new clusterhas no significant radio emission. Comparison to theoretical K-band luminosityfunctions indicates an age of at least several Gyr and a mass of at least 10^5solar masses. Unlike known old open clusters, this new cluster lies in theinner Galaxy at R_{GC} ~ 6.1 kpc. We designate this object ``GLIMPSE-C01'' andclassify it as a Milky Way globular cluster passing through the Galactic disk.We also identify a region of star formation and fan-shaped outflows from youngstellar objects in the same field as the cluster. The cluster's passage throughthe Galactic molecular layer may have triggered this star formation activity.

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