The ellipticities of Galactic and Large Magellanic Cloud globular clusters | Zendy

S. P. Goodwin | Zendy

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The ellipticities of Galactic and Large Magellanic Cloud globular clusters

Author(s) -

S. P. Goodwin

Publication year - 1997

Publication title -

monthly notices of the royal astronomical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.058

H-Index - 383

eISSN - 1365-8711

pISSN - 0035-8711

DOI - 10.1093/mnras/286.3.l39

Subject(s) - globular cluster , physics , astrophysics , large magellanic cloud , galaxy , star cluster , astronomy

The globular clusters of the LMC are found to be significantly moreelliptical than Galactic globular clusters, but very similar in virtually allother respects. The ellipticity of the LMC globular clusters is shown not becorrelated with the age or mass of those clusters. It is proposed that theellipticity differences are caused by the different strengths of the tidalfields in the LMC and the Galaxy. The strong Galactic tidal field erasesinitial velocity anisotropies and removes angular momentum from globularclusters making them more spherical. The tidal field of the LMC is not strongenough to perform these tasks and its globular clusters remain close to theirinitial states.Comment: 3 pages LaTeX file with 3 figures incorporated accepted for publication in MNRAS. Also available by e-mailing spg, or by ftp from ftp://star-www.maps.susx.ac.uk/pub/papers/spg/ellip.ps.

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