A Young Globular Cluster in the Galaxy NGC 6946 | Zendy

Bruce G. Elmegreen | Zendy; Yuri N. Efremov | Zendy; S. S. Larsen | Zendy

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A Young Globular Cluster in the Galaxy NGC 6946

Author(s) -

Bruce G. Elmegreen,

Yuri N. Efremov,

S. S. Larsen

Publication year - 2000

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/308898

Subject(s) - globular cluster , physics , astrophysics , spiral galaxy , astronomy , star cluster , milky way , galaxy , cluster (spacecraft) , radius , open cluster , galaxy cluster , superbubble , stars , interstellar medium , computer security , computer science , programming language

A globular cluster ~15 My old that contains 5x10^5 Msun of stars inside an 11pc radius has been found in the nearby spiral galaxy NGC 6946, surrounded byclouds of dust and smaller young clusters inside a giant circular bubble 300 pcin radius. At the edge of the bubble is an arc of regularly-spaced clustersthat could have been triggered during the bubble's formation. The region is atthe end of a spiral arm, suggesting an origin by the asymmetric collapse ofspiral arm gas. The globular is one of the nearest examples of a cluster thatis similar to the massive old globulars in the Milky Way. We consider theenergetics of the bubble and possible formation mechanisms for the globularcluster, including the coalescence of smaller clusters.Comment: 20 pages, 7 figures, accepted for Astrophysical Journal Vol 535, June 1 200

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