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Zoekopdracht: journal id: "astrophysicalxjournal"

AuteursD. Merritt, S. Piatek, S.F. Portegies Zwart, M. Hemsendorf
TitelCore Formation by a Population of Massive Remnants
TijdschriftAstrophysical Journal
Jaargang608
Jaar2004
Pagina'sL25-L28
ISSN0004637X
FaculteitFaculteit der Natuurwetenschappen, Wiskunde en Informatica
Instituut/afd.FNWI: Astronomical Institute Anton Pannekoek (IAP)
FNWI: Informatics Institute (II)
Trefwoorden-
SamenvattingCore radii of globular clusters in the Large and Small Magellanic Clouds show an increasing trend with age. We propose that this trend is a dynamical effect resulting from the accumulation of massive stars and stellar-mass black holes at the cluster centers. The black holes are remnants of stars with initial masses exceeding ~20-25 M<SUB>solar</SUB> as their orbits decay by dynamical friction, they heat the stellar background and create a core. Using analytical estimates and N-body experiments, we show that the sizes of the cores so produced and their growth rates are consistent with what is observed. We propose that this mechanism is responsible for the formation of cores in all globular clusters and possibly in other systems as well.
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