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A preliminary survey of collapsed cores in the Magellanic Clouds' globular clusters

Meylan, G. and Djorgovski, S. (1987) A preliminary survey of collapsed cores in the Magellanic Clouds' globular clusters. Astrophysical Journal, 322 . L91-L94. ISSN 0004-637X. doi:10.1086/185042.

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We present a preliminary report on a surface photometry survey for collapsed cores in the Magellanic Clouds’ globular clusters. We give core morphology classifications for the 33 globular clusters examined so far. One cluster, NGC 2019, shows definite signs of a collapsed core, and two others, NGC 1774 and NGC 1951, appear as strong candidates. This detection of postcollapse cores outside the Milky Way opens some interesting prospects for future dynamical studies. However, the fraction of collapsed-core clusters appears to be smaller in the Magellanic Clouds than in the Galaxy. This may be due in part to their younger ages, or to the limitations imposed by the seeing effects. It is also possible that the relative scarcity reflects the physical difference in the tidal field environments between the Galaxy and the Clouds, in agreement with a trend found earlier, viz., that the tidal shocks from disk passages accelerate dynamical evolution and enhance the propensity for core collapse.

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Djorgovski, S.0000-0002-0603-3087
Additional Information:© 1987 The American Astronomical Society. Received 1987 July 14; accepted 1987 August 18. Based on observations made at the European Southern Observatory, La Silla, Chile. We would like to thank the staff of the European Southern Observatory at La Silla (Chile) for its help during our observing run, especially M. Bahamondes and J. Borquez. Many thanks also to Ivan King and to the rest of the Berkeley Astronomy Department for their hospitality, where the largest fraction of this work was completed. Stimulating discussions with Ivan King and Mario Mateo were most valuable. We thank the anonymous referee for helping turn our Yugo-Swiss into an approximation of English. S. D. acknowledges partial support from Harvard University.
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ID Code:97635
Deposited By: Tony Diaz
Deposited On:05 Aug 2019 17:45
Last Modified:16 Nov 2021 17:33

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