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Spectroscopy of the globular clusters in M87 (1986)

Mould, J. R. ; Nemec, J. M. ; Oke, J. B.

In: CASI

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Publication Date: 2019-06-28

Description: With a velocity dispersion of 370 + or - 50 km/sec the globular cluster system of M87 is kinematically hotter than the stars in the giant elliptical itself. This is consistent with the clusters' shallower density distribution for isotropic orbits. The mean metallicity of the 27 clusters in the sample analyzed here is no more than a factor of 2 more metal rich than the cluster system of the Milky Way, but considerably more metal poowr than the integrated starlight in the field at a radius of 1' from the center of M87. There is no evidence for the existence of young clusters in the system. The mass-radius relation between 1' and 5' required to contain the globular clusters joins on to that required to contain the hot gas around M87.

Keywords: ASTRONOMY

Type: NASA-CR-179854 , NAS 1.26:179854

Format: application/pdf

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